Articles | Volume 16, issue 2
https://doi.org/10.5194/bg-16-409-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-16-409-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| Highlight paper
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25 Jan 2019
Research article | Highlight paper |
| 25 Jan 2019
| 25 Jan 2019
Stable carbon and nitrogen isotopic composition of leaves, litter, and soils of various ecosystems along an elevational and land-use gradient at Mount Kilimanjaro, Tanzania
Friederike Gerschlauer
Institute of Meteorology and Climate Research, Karlsruhe Institute of
Technology, Garmisch-Partenkirchen, Germany
Department of Environmental Chemistry, Faculty of Sciences,
Universidad Católica de la Santísima Concepción,
Concepción, Chile
Institute of Meteorology and Climate Research, Karlsruhe Institute of
Technology, Garmisch-Partenkirchen, Germany
David Schellenberger Costa
Department of Biology and Environmental Sciences, University of
Oldenburg, Oldenburg, Germany
Michael Kleyer
Department of Biology and Environmental Sciences, University of
Oldenburg, Oldenburg, Germany
Michael Dannenmann
Institute of Meteorology and Climate Research, Karlsruhe Institute of
Technology, Garmisch-Partenkirchen, Germany
Ralf Kiese
Institute of Meteorology and Climate Research, Karlsruhe Institute of
Technology, Garmisch-Partenkirchen, Germany
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Elizabeth Gachibu Wangari, Ricky Mwangada Mwanake, Tobias Houska, David Kraus, Gretchen Maria Gettel, Ralf Kiese, Lutz Breuer, and Klaus Butterbach-Bahl
Biogeosciences, 20, 5029–5067, https://doi.org/10.5194/bg-20-5029-2023, https://doi.org/10.5194/bg-20-5029-2023, 2023
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Agricultural landscapes act as sinks or sources of the greenhouse gases (GHGs) CO2, CH4, or N2O. Various physicochemical and biological processes control the fluxes of these GHGs between ecosystems and the atmosphere. Therefore, fluxes depend on environmental conditions such as soil moisture, soil temperature, or soil parameters, which result in large spatial and temporal variations of GHG fluxes. Here, we describe an example of how this variation may be studied and analyzed.
Ricky Mwangada Mwanake, Gretchen Maria Gettel, Elizabeth Gachibu Wangari, Clarissa Glaser, Tobias Houska, Lutz Breuer, Klaus Butterbach-Bahl, and Ralf Kiese
Biogeosciences, 20, 3395–3422, https://doi.org/10.5194/bg-20-3395-2023, https://doi.org/10.5194/bg-20-3395-2023, 2023
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Despite occupying <1 %; of the globe, streams are significant sources of greenhouse gas (GHG) emissions. In this study, we determined anthropogenic effects on GHG emissions from streams. We found that anthropogenic-influenced streams had up to 20 times more annual GHG emissions than natural ones and were also responsible for seasonal peaks. Anthropogenic influences also altered declining GHG flux trends with stream size, with potential impacts on stream-size-based spatial upscaling techniques.
Joseph Okello, Marijn Bauters, Hans Verbeeck, Samuel Bodé, John Kasenene, Astrid Françoys, Till Engelhardt, Klaus Butterbach-Bahl, Ralf Kiese, and Pascal Boeckx
Biogeosciences, 20, 719–735, https://doi.org/10.5194/bg-20-719-2023, https://doi.org/10.5194/bg-20-719-2023, 2023
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The increase in global and regional temperatures has the potential to drive accelerated soil organic carbon losses in tropical forests. We simulated climate warming by translocating intact soil cores from higher to lower elevations. The results revealed increasing temperature sensitivity and decreasing losses of soil organic carbon with increasing elevation. Our results suggest that climate warming may trigger enhanced losses of soil organic carbon from tropical montane forests.
Friedrich Boeing, Oldrich Rakovec, Rohini Kumar, Luis Samaniego, Martin Schrön, Anke Hildebrandt, Corinna Rebmann, Stephan Thober, Sebastian Müller, Steffen Zacharias, Heye Bogena, Katrin Schneider, Ralf Kiese, Sabine Attinger, and Andreas Marx
Hydrol. Earth Syst. Sci., 26, 5137–5161, https://doi.org/10.5194/hess-26-5137-2022, https://doi.org/10.5194/hess-26-5137-2022, 2022
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In this paper, we deliver an evaluation of the second generation operational German drought monitor (https://www.ufz.de/duerremonitor) with a state-of-the-art compilation of observed soil moisture data from 40 locations and four different measurement methods in Germany. We show that the expressed stakeholder needs for higher resolution drought information at the one-kilometer scale can be met and that the agreement of simulated and observed soil moisture dynamics can be moderately improved.
Anne Schucknecht, Bumsuk Seo, Alexander Krämer, Sarah Asam, Clement Atzberger, and Ralf Kiese
Biogeosciences, 19, 2699–2727, https://doi.org/10.5194/bg-19-2699-2022, https://doi.org/10.5194/bg-19-2699-2022, 2022
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Actual maps of grassland traits could improve local farm management and support environmental assessments. We developed, assessed, and applied models to estimate dry biomass and plant nitrogen (N) concentration in pre-Alpine grasslands with drone-based multispectral data and canopy height information. Our results indicate that machine learning algorithms are able to estimate both parameters but reach a better level of performance for biomass.
Rahayu Adzhar, Douglas I. Kelley, Ning Dong, Charles George, Mireia Torello Raventos, Elmar Veenendaal, Ted R. Feldpausch, Oliver L. Phillips, Simon L. Lewis, Bonaventure Sonké, Herman Taedoumg, Beatriz Schwantes Marimon, Tomas Domingues, Luzmila Arroyo, Gloria Djagbletey, Gustavo Saiz, and France Gerard
Biogeosciences, 19, 1377–1394, https://doi.org/10.5194/bg-19-1377-2022, https://doi.org/10.5194/bg-19-1377-2022, 2022
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The MODIS Vegetation Continuous Fields (VCF) product underestimates tree cover compared to field data and could be underestimating tree cover significantly across the tropics. VCF is used to represent land cover or validate model performance in many land surface and global vegetation models and to train finer-scaled Earth observation products. Because underestimation in VCF may render it unsuitable for training data and bias model predictions, it should be calibrated before use in the tropics.
Matthias Mauder, Andreas Ibrom, Luise Wanner, Frederik De Roo, Peter Brugger, Ralf Kiese, and Kim Pilegaard
Atmos. Meas. Tech., 14, 7835–7850, https://doi.org/10.5194/amt-14-7835-2021, https://doi.org/10.5194/amt-14-7835-2021, 2021
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Turbulent flux measurements suffer from a general systematic underestimation. One reason for this bias is non-local transport by large-scale circulations. A recently developed model for this additional transport of sensible and latent energy is evaluated for three different test sites. Different options on how to apply this correction are presented, and the results are evaluated against independent measurements.
Benjamin Fersch, Till Francke, Maik Heistermann, Martin Schrön, Veronika Döpper, Jannis Jakobi, Gabriele Baroni, Theresa Blume, Heye Bogena, Christian Budach, Tobias Gränzig, Michael Förster, Andreas Güntner, Harrie-Jan Hendricks Franssen, Mandy Kasner, Markus Köhli, Birgit Kleinschmit, Harald Kunstmann, Amol Patil, Daniel Rasche, Lena Scheiffele, Ulrich Schmidt, Sandra Szulc-Seyfried, Jannis Weimar, Steffen Zacharias, Marek Zreda, Bernd Heber, Ralf Kiese, Vladimir Mares, Hannes Mollenhauer, Ingo Völksch, and Sascha Oswald
Earth Syst. Sci. Data, 12, 2289–2309, https://doi.org/10.5194/essd-12-2289-2020, https://doi.org/10.5194/essd-12-2289-2020, 2020
Isabel Prater, Sebastian Zubrzycki, Franz Buegger, Lena C. Zoor-Füllgraff, Gerrit Angst, Michael Dannenmann, and Carsten W. Mueller
Biogeosciences, 17, 3367–3383, https://doi.org/10.5194/bg-17-3367-2020, https://doi.org/10.5194/bg-17-3367-2020, 2020
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Large amounts of soil organic matter stored in permafrost-affected soils from Arctic Russia are present as undecomposed plant residues. This large fibrous organic matter might be highly vulnerable to microbial decay, while small mineral-associated organic matter can most probably attenuate carbon mineralization in a warmer future. Labile soil fractions also store large amounts of nitrogen, which might be lost during permafrost collapse while fostering the decomposition of soil organic matter.
Chris R. Flechard, Andreas Ibrom, Ute M. Skiba, Wim de Vries, Marcel van Oijen, David R. Cameron, Nancy B. Dise, Janne F. J. Korhonen, Nina Buchmann, Arnaud Legout, David Simpson, Maria J. Sanz, Marc Aubinet, Denis Loustau, Leonardo Montagnani, Johan Neirynck, Ivan A. Janssens, Mari Pihlatie, Ralf Kiese, Jan Siemens, André-Jean Francez, Jürgen Augustin, Andrej Varlagin, Janusz Olejnik, Radosław Juszczak, Mika Aurela, Daniel Berveiller, Bogdan H. Chojnicki, Ulrich Dämmgen, Nicolas Delpierre, Vesna Djuricic, Julia Drewer, Eric Dufrêne, Werner Eugster, Yannick Fauvel, David Fowler, Arnoud Frumau, André Granier, Patrick Gross, Yannick Hamon, Carole Helfter, Arjan Hensen, László Horváth, Barbara Kitzler, Bart Kruijt, Werner L. Kutsch, Raquel Lobo-do-Vale, Annalea Lohila, Bernard Longdoz, Michal V. Marek, Giorgio Matteucci, Marta Mitosinkova, Virginie Moreaux, Albrecht Neftel, Jean-Marc Ourcival, Kim Pilegaard, Gabriel Pita, Francisco Sanz, Jan K. Schjoerring, Maria-Teresa Sebastià, Y. Sim Tang, Hilde Uggerud, Marek Urbaniak, Netty van Dijk, Timo Vesala, Sonja Vidic, Caroline Vincke, Tamás Weidinger, Sophie Zechmeister-Boltenstern, Klaus Butterbach-Bahl, Eiko Nemitz, and Mark A. Sutton
Biogeosciences, 17, 1583–1620, https://doi.org/10.5194/bg-17-1583-2020, https://doi.org/10.5194/bg-17-1583-2020, 2020
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Experimental evidence from a network of 40 monitoring sites in Europe suggests that atmospheric nitrogen deposition to forests and other semi-natural vegetation impacts the carbon sequestration rates in ecosystems, as well as the net greenhouse gas balance including other greenhouse gases such as nitrous oxide and methane. Excess nitrogen deposition in polluted areas also leads to other environmental impacts such as nitrogen leaching to groundwater and other pollutant gaseous emissions.
Carlos Alberto Quesada, Claudia Paz, Erick Oblitas Mendoza, Oliver Lawrence Phillips, Gustavo Saiz, and Jon Lloyd
SOIL, 6, 53–88, https://doi.org/10.5194/soil-6-53-2020, https://doi.org/10.5194/soil-6-53-2020, 2020
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Amazon soils hold as much carbon (C) as is contained in the vegetation. In this work we sampled soils across 8 different Amazonian countries to try to understand which soil properties control current Amazonian soil C concentrations. We confirm previous knowledge that highly developed soils hold C through clay content interactions but also show a previously unreported mechanism of soil C stabilization in the younger Amazonian soil types which hold C through aluminium organic matter interactions.
Erkan Ibraim, Benjamin Wolf, Eliza Harris, Rainer Gasche, Jing Wei, Longfei Yu, Ralf Kiese, Sarah Eggleston, Klaus Butterbach-Bahl, Matthias Zeeman, Béla Tuzson, Lukas Emmenegger, Johan Six, Stephan Henne, and Joachim Mohn
Biogeosciences, 16, 3247–3266, https://doi.org/10.5194/bg-16-3247-2019, https://doi.org/10.5194/bg-16-3247-2019, 2019
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Nitrous oxide (N2O) is an important greenhouse gas and the major stratospheric ozone-depleting substance; therefore, mitigation of anthropogenic N2O emissions is needed. To trace N2O-emitting source processes, in this study, we observed N2O isotopocules above an intensively managed grassland research site with a recently developed laser spectroscopy method. Our results indicate that the domain of denitrification or nitrifier denitrification was the major N2O source.
Tobias Houska, David Kraus, Ralf Kiese, and Lutz Breuer
Biogeosciences, 14, 3487–3508, https://doi.org/10.5194/bg-14-3487-2017, https://doi.org/10.5194/bg-14-3487-2017, 2017
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CO2 and N2O are two prominent GHGs contributing to global warming. We combined measurement and modelling to quantify GHG emissions from adjacent arable, forest and grassland sites in Germany. Measured emissions reveal seasonal patterns and management effects like fertilizer application, tillage, harvest and grazing. Modelling helps to estimate the magnitude and uncertainty of not measurable C and N fluxes and indicates missing input source, e.g. nitrate uptake from groundwater.
Stephanie K. Jones, Carole Helfter, Margaret Anderson, Mhairi Coyle, Claire Campbell, Daniela Famulari, Chiara Di Marco, Netty van Dijk, Y. Sim Tang, Cairistiona F. E. Topp, Ralf Kiese, Reimo Kindler, Jan Siemens, Marion Schrumpf, Klaus Kaiser, Eiko Nemitz, Peter E. Levy, Robert M. Rees, Mark A. Sutton, and Ute M. Skiba
Biogeosciences, 14, 2069–2088, https://doi.org/10.5194/bg-14-2069-2017, https://doi.org/10.5194/bg-14-2069-2017, 2017
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We assessed the nitrogen (N), carbon (C) and greenhouse gas (GHG) budget from an intensively managed grassland in southern Scotland using flux budget calculations as well as changes in soil N and C pools over time. Estimates from flux budget calculations indicated that N and C were sequestered, whereas soil stock measurements indicated a smaller N storage and a loss of C from the ecosystem. The GHG sink strength of the net CO2 ecosystem exchange was strongly affected by CH4 and N2O emissions.
David Pelster, Mariana Rufino, Todd Rosenstock, Joash Mango, Gustavo Saiz, Eugenio Diaz-Pines, German Baldi, and Klaus Butterbach-Bahl
Biogeosciences, 14, 187–202, https://doi.org/10.5194/bg-14-187-2017, https://doi.org/10.5194/bg-14-187-2017, 2017
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In order to quantify greenhouse gas fluxes from typical eastern African smallholder farms, we measured flux rates every week for 1 year at 59 farms in western Kenya. These upland soils tend to be small sinks for CH4 and small sources of N2O. The management intensity of the farm plots had no effect on emissions, likely because the variability was low. Plots with trees had higher CH4 uptake than other plots. This suggests that emissions from small, low-input farms in this region are quite low.
G. Saiz, M. Bird, C. Wurster, C. A. Quesada, P. Ascough, T. Domingues, F. Schrodt, M. Schwarz, T. R. Feldpausch, E. Veenendaal, G. Djagbletey, G. Jacobsen, F. Hien, H. Compaore, A. Diallo, and J. Lloyd
Biogeosciences, 12, 5041–5059, https://doi.org/10.5194/bg-12-5041-2015, https://doi.org/10.5194/bg-12-5041-2015, 2015
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We demonstrate and explain differential patterns in SOM dynamics in C3/C4 mixed ecosystems at various spatial scales across contrasting climate and soils. This study shows that the interdependence between biotic and abiotic factors ultimately determines whether SOM dynamics of C3- and C4-derived vegetation are at variance in ecosystems where both vegetation types coexist. The results also highlight the far-reaching implications that vegetation thickening may have for the stability of deep SOM.
M. Liu, M. Dannenmann, S. Lin, G. Saiz, G. Yan, Z. Yao, D. E. Pelster, H. Tao, S. Sippel, Y. Tao, Y. Zhang, X. Zheng, Q. Zuo, and K. Butterbach-Bahl
Biogeosciences, 12, 4831–4840, https://doi.org/10.5194/bg-12-4831-2015, https://doi.org/10.5194/bg-12-4831-2015, 2015
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We demonstrate for the first time that a ground cover rice production system (GCRPS) significantly increased soil organic C and total N stocks at spatially representative paired sites under varying edaphic conditions. Our results suggest that GCRPS is a stable and sustainable technique that maintains key soil functions, while increasing rice yield and expanding the cultivation into regions where it has been hampered by low seasonal temperatures and/or a lack of irrigation water.
E. M. Veenendaal, M. Torello-Raventos, T. R. Feldpausch, T. F. Domingues, F. Gerard, F. Schrodt, G. Saiz, C. A. Quesada, G. Djagbletey, A. Ford, J. Kemp, B. S. Marimon, B. H. Marimon-Junior, E. Lenza, J. A. Ratter, L. Maracahipes, D. Sasaki, B. Sonké, L. Zapfack, D. Villarroel, M. Schwarz, F. Yoko Ishida, M. Gilpin, G. B. Nardoto, K. Affum-Baffoe, L. Arroyo, K. Bloomfield, G. Ceca, H. Compaore, K. Davies, A. Diallo, N. M. Fyllas, J. Gignoux, F. Hien, M. Johnson, E. Mougin, P. Hiernaux, T. Killeen, D. Metcalfe, H. S. Miranda, M. Steininger, K. Sykora, M. I. Bird, J. Grace, S. Lewis, O. L. Phillips, and J. Lloyd
Biogeosciences, 12, 2927–2951, https://doi.org/10.5194/bg-12-2927-2015, https://doi.org/10.5194/bg-12-2927-2015, 2015
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When nearby forest and savanna stands are compared, they are not as structurally different as first seems. Moreover, savanna-forest transition zones typically occur at higher rainfall for South America than for Africa but with coexistence confined to a well-defined edaphic-climate envelope. With interacting soil cation-soil water storage–precipitations effects on canopy cover also observed we argue that both soils and climate influence the location of the two major tropical vegetation types.
G. Saiz, J. G. Wynn, C. M. Wurster, I. Goodrick, P. N. Nelson, and M. I. Bird
Biogeosciences, 12, 1849–1863, https://doi.org/10.5194/bg-12-1849-2015, https://doi.org/10.5194/bg-12-1849-2015, 2015
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Around half of all pyrogenic carbon (charcoal+soot) derived from wildfires comes from semi-annual burning of tropical savannas. This pyrogenic carbon is significant because it is a component of global aerosols capable of modulating the greenhouse effect and is resistant to degradation. We use controlled field burns in northern Australian savannas to determine how much pyrogenic carbon is formed, how much of this is recalcitrant and how it is partitioned between ground residues and airborne soot.
K. J. Bloomfield, T. F. Domingues, G. Saiz, M. I. Bird, D. M. Crayn, A. Ford, D. J. Metcalfe, G. D. Farquhar, and J. Lloyd
Biogeosciences, 11, 7331–7347, https://doi.org/10.5194/bg-11-7331-2014, https://doi.org/10.5194/bg-11-7331-2014, 2014
C. Werner, K. Reiser, M. Dannenmann, L. B. Hutley, J. Jacobeit, and K. Butterbach-Bahl
Biogeosciences, 11, 6047–6065, https://doi.org/10.5194/bg-11-6047-2014, https://doi.org/10.5194/bg-11-6047-2014, 2014
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Atmospheric loss of N from savanna soil was dominated by N2 emissions (82-99% of total N loss to atmosphere). Nitric oxide emissions significantly contributed at 50% WFPS; high temperatures and N2O emissions were negligible. Based on a simple upscale approach we estimated annual loss of N to the atmosphere at 7.5kg yr-1. N2O emission was low for most samples, but high for a small subset of cores at 75% WFPS (due to short periods where such conditions occur this has little effect on totals).
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Arctic greenhouse gas (GHG) fluxes of CO2, CH4, and N2O are important for climate feedbacks. We combined extensive in situ measurements and remote sensing data to develop machine-learning models to predict GHG fluxes at a 2 m resolution across a tundra landscape. The analysis revealed that the system was a net GHG sink and showed widespread CH4 uptake in upland vegetation types, almost surpassing the high wetland CH4 emissions at the landscape scale.
Thomas Baer, Gerhard Furrer, Stephan Zimmermann, and Patrick Schleppi
Biogeosciences, 20, 4577–4589, https://doi.org/10.5194/bg-20-4577-2023, https://doi.org/10.5194/bg-20-4577-2023, 2023
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Nitrogen (N) deposition to forest ecosystems is a matter of concern because it affects their nutrient status and makes their soil acidic. We observed an ongoing acidification in a montane forest in central Switzerland even if the subsoil of this site contains carbonates and is thus well buffered. We experimentally added N to simulate a higher pollution, and this increased the acidification. After 25 years of study, however, we can see the first signs of recovery, also under higher N deposition.
Huiying Xu, Han Wang, Iain Colin Prentice, and Sandy P. Harrison
Biogeosciences, 20, 4511–4525, https://doi.org/10.5194/bg-20-4511-2023, https://doi.org/10.5194/bg-20-4511-2023, 2023
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Leaf carbon (C) and nitrogen (N) are crucial elements in leaf construction and physiological processes. This study reconciled the roles of phylogeny, species identity, and climate in stoichiometric traits at individual and community levels. The variations in community-level leaf N and C : N ratio were captured by optimality-based models using climate data. Our results provide an approach to improve the representation of leaf stoichiometry in vegetation models to better couple N with C cycling.
Juliëtte C. S. Anema, Klaas Folkert Boersma, Piet Stammes, Gerbrand Koren, William Woodgate, Philipp Köhler, Christian Frankenberg, and Jacqui Stol
EGUsphere, https://doi.org/10.5194/egusphere-2023-1930, https://doi.org/10.5194/egusphere-2023-1930, 2023
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To keep the Paris agreement goals within reach, negative emissions will be necessary. They can be achieved with mitigation techniques such as reforestation that remove CO2 from the atmosphere. While governments have pinned their hopes on them, there is not yet a good set of tools to objectively determine whether negative emissions do what they promise. Here we show how satellite measurements of plant fluorescence are useful in detecting carbon uptake by reforestation and vegetation regrowth.
István Dunkl, Nicole Lovenduski, Alessio Collalti, Vivek K. Arora, Tatiana Ilyina, and Victor Brovkin
Biogeosciences, 20, 3523–3538, https://doi.org/10.5194/bg-20-3523-2023, https://doi.org/10.5194/bg-20-3523-2023, 2023
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Despite differences in the reproduction of gross primary productivity (GPP) by Earth system models (ESMs), ESMs have similar predictability of the global carbon cycle. We found that, although GPP variability originates from different regions and is driven by different climatic variables across the ESMs, the ESMs rely on the same mechanisms to predict their own GPP. This shows that the predictability of the carbon cycle is limited by our understanding of variability rather than predictability.
Martin Jung, Jacob Nelson, Mirco Migliavacca, Tarek El-Madany, Dario Papale, Markus Reichstein, Sophia Walther, and Thomas Wutzler
Biogeosciences Discuss., https://doi.org/10.5194/bg-2023-110, https://doi.org/10.5194/bg-2023-110, 2023
Revised manuscript accepted for BG
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We present a methodology to detect inconsistencies in perhaps the most important data source for measurements of ecosystem-atmosphere carbon, water, and energy fluxes. We expect that the derived consistency flags will be relevant for data users, and will help in improving our understanding of, and our ability to model, ecosystem-climate interactions.
David T. Milodowski, T. Luke Smallman, and Mathew Williams
Biogeosciences, 20, 3301–3327, https://doi.org/10.5194/bg-20-3301-2023, https://doi.org/10.5194/bg-20-3301-2023, 2023
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Model–data fusion (MDF) allows us to combine ecosystem models with Earth observation data. Fragmented landscapes, with a mosaic of contrasting ecosystems, pose a challenge for MDF. We develop a novel MDF framework to estimate the carbon balance of fragmented landscapes and show the importance of accounting for ecosystem heterogeneity to prevent scale-dependent bias in estimated carbon fluxes, disturbance fluxes in particular, and to improve ecological fidelity of the calibrated models.
Keri L. Bowering, Kate A. Edwards, and Susan E. Ziegler
Biogeosciences, 20, 2189–2206, https://doi.org/10.5194/bg-20-2189-2023, https://doi.org/10.5194/bg-20-2189-2023, 2023
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Dissolved organic matter (DOM) mobilized from surface soils is a source of carbon (C) for deeper mineral horizons but also a mechanism of C loss. Composition of DOM mobilized in boreal forests varied more by season than as a result of forest harvesting. Results suggest reduced snowmelt and increased fall precipitation enhance DOM properties promoting mineral soil C stores. These findings, coupled with hydrology, can inform on soil C fate and boreal forest C balance in response to climate change.
Bharat Sharma, Jitendra Kumar, Auroop R. Ganguly, and Forrest M. Hoffman
Biogeosciences, 20, 1829–1841, https://doi.org/10.5194/bg-20-1829-2023, https://doi.org/10.5194/bg-20-1829-2023, 2023
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Rising atmospheric carbon dioxide increases vegetation growth and causes more heatwaves and droughts. The impact of such climate extremes is detrimental to terrestrial carbon uptake capacity. We found that due to overall climate warming, about 88 % of the world's regions towards the end of 2100 will show anomalous losses in net biospheric productivity (NBP) rather than gains. More than 50 % of all negative NBP extremes were driven by the compound effect of dry, hot, and fire conditions.
Prajwal Khanal, Anne Hoek Van Dijke, Timo Schaffhauser, Wantong Li, Sinikka J. Paulus, Chunhui Zhan, and René Orth
EGUsphere, https://doi.org/10.5194/egusphere-2023-770, https://doi.org/10.5194/egusphere-2023-770, 2023
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Water availability is essential for vegetation functioning, but the depth of vegetation water uptake is largely unknown due to sparse ground measurements. This study correlates the vegetation growth with soil moisture avaialbility globally to infer to vegetation water uptake depth using only satellite-based data. We find that the vegetation water-uptake depth varies across climate regimes and vegetation types and also changes during dry months on a global scale.
Britta Greenshields, Barbara von der Lühe, Felix Schwarz, Harold J. Hughes, Aiyen Tjoa, Martyna Kotowska, Fabian Brambach, and Daniela Sauer
Biogeosciences, 20, 1259–1276, https://doi.org/10.5194/bg-20-1259-2023, https://doi.org/10.5194/bg-20-1259-2023, 2023
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Silicon (Si) can have multiple beneficial effects on crops such as oil palms. In this study, we quantified Si concentrations in various parts of an oil palm (leaflets, rachises, fruit-bunch parts) to derive Si storage estimates for the total above-ground biomass of an oil palm and 1 ha of an oil-palm plantation. We proposed a Si balance by identifying Si return (via palm fronds) and losses (via harvest) in the system and recommend management measures that enhance Si cycling.
Luisa Schmidt, Matthias Forkel, Ruxandra-Maria Zotta, Samuel Scherrer, Wouter A. Dorigo, Alexander Kuhn-Régnier, Robin van der Schalie, and Marta Yebra
Biogeosciences, 20, 1027–1046, https://doi.org/10.5194/bg-20-1027-2023, https://doi.org/10.5194/bg-20-1027-2023, 2023
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Vegetation attenuates natural microwave emissions from the land surface. The strength of this attenuation is quantified as the vegetation optical depth (VOD) parameter and is influenced by the vegetation mass, structure, water content, and observation wavelength. Here we model the VOD signal as a multi-variate function of several descriptive vegetation variables. The results help in understanding the effects of ecosystem properties on VOD.
Nagham Tabaja, David Amouroux, Lamis Chalak, François Fourel, Emmanuel Tessier, Ihab Jomaa, Milad El Riachy, and Ilham Bentaleb
Biogeosciences, 20, 619–633, https://doi.org/10.5194/bg-20-619-2023, https://doi.org/10.5194/bg-20-619-2023, 2023
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This study investigates the seasonality of the mercury (Hg) concentration of olive trees. Hg concentrations of foliage, stems, soil surface, and litter were analyzed on a monthly basis in ancient olive trees growing in two groves in Lebanon. Our study draws an adequate baseline for the eastern Mediterranean and for the region with similar climatic inventories on Hg vegetation uptake in addition to being a baseline for new studies on olive trees in the Mediterranean.
Allison N. Myers-Pigg, Karl Kaiser, Ronald Benner, and Susan E. Ziegler
Biogeosciences, 20, 489–503, https://doi.org/10.5194/bg-20-489-2023, https://doi.org/10.5194/bg-20-489-2023, 2023
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Boreal forests, historically a global sink for atmospheric CO2, store carbon in vast soil reservoirs. To predict how such stores will respond to climate warming we need to understand climate–ecosystem feedbacks. We find boreal forest soil carbon stores are maintained through enhanced nitrogen cycling with climate warming, providing direct evidence for a key feedback. Further application of the approach demonstrated here will improve our understanding of the limits of climate–ecosystem feedbacks.
Matthew P. Dannenberg, Mallory L. Barnes, William K. Smith, Miriam R. Johnston, Susan K. Meerdink, Xian Wang, Russell L. Scott, and Joel A. Biederman
Biogeosciences, 20, 383–404, https://doi.org/10.5194/bg-20-383-2023, https://doi.org/10.5194/bg-20-383-2023, 2023
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Earth's drylands provide ecosystem services to many people and will likely be strongly affected by climate change, but it is quite challenging to monitor the productivity and water use of dryland plants with satellites. We developed and tested an approach for estimating dryland vegetation activity using machine learning to combine information from multiple satellite sensors. Our approach excelled at estimating photosynthesis and water use largely due to the inclusion of satellite soil moisture.
Mark Pickering, Alessandro Cescatti, and Gregory Duveiller
Biogeosciences, 19, 4833–4864, https://doi.org/10.5194/bg-19-4833-2022, https://doi.org/10.5194/bg-19-4833-2022, 2022
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This study explores two of the most recent products in carbon productivity estimation, FLUXCOM gross primary productivity (GPP), calculated by upscaling local measurements of CO2 exchange, and remotely sensed sun-induced chlorophyll a fluorescence (SIF). High-resolution SIF data are valuable in demonstrating similarity in the SIF–GPP relationship between vegetation covers, provide an independent probe of the FLUXCOM GPP model and demonstrate the response of SIF to meteorological fluctuations.
Sophia Walther, Simon Besnard, Jacob Allen Nelson, Tarek Sebastian El-Madany, Mirco Migliavacca, Ulrich Weber, Nuno Carvalhais, Sofia Lorena Ermida, Christian Brümmer, Frederik Schrader, Anatoly Stanislavovich Prokushkin, Alexey Vasilevich Panov, and Martin Jung
Biogeosciences, 19, 2805–2840, https://doi.org/10.5194/bg-19-2805-2022, https://doi.org/10.5194/bg-19-2805-2022, 2022
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Satellite observations help interpret station measurements of local carbon, water, and energy exchange between the land surface and the atmosphere and are indispensable for simulations of the same in land surface models and their evaluation. We propose generalisable and efficient approaches to systematically ensure high quality and to estimate values in data gaps. We apply them to satellite data of surface reflectance and temperature with different resolutions at the stations.
Elisabeth Mauclet, Yannick Agnan, Catherine Hirst, Arthur Monhonval, Benoît Pereira, Aubry Vandeuren, Maëlle Villani, Justin Ledman, Meghan Taylor, Briana L. Jasinski, Edward A. G. Schuur, and Sophie Opfergelt
Biogeosciences, 19, 2333–2351, https://doi.org/10.5194/bg-19-2333-2022, https://doi.org/10.5194/bg-19-2333-2022, 2022
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Arctic warming and permafrost degradation largely affect tundra vegetation. Wetter lowlands show an increase in sedges, whereas drier uplands favor shrub expansion. Here, we demonstrate that the difference in the foliar elemental composition of typical tundra vegetation species controls the change in local foliar elemental stock and potential mineral element cycling through litter production upon a shift in tundra vegetation.
Tiexi Chen, Renjie Guo, Qingyun Yan, Xin Chen, Shengjie Zhou, Chuanzhuang Liang, Xueqiong Wei, and Han Dolman
Biogeosciences, 19, 1515–1525, https://doi.org/10.5194/bg-19-1515-2022, https://doi.org/10.5194/bg-19-1515-2022, 2022
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Currently people are very concerned about vegetation changes and their driving factors, including natural and anthropogenic drivers. In this study, a general browning trend is found in Syria during 2001–2018, indicated by the vegetation index. We found that land management caused by social unrest is the main cause of this browning phenomenon. The mechanism initially reported here highlights the importance of land management impacts at the regional scale.
Rahayu Adzhar, Douglas I. Kelley, Ning Dong, Charles George, Mireia Torello Raventos, Elmar Veenendaal, Ted R. Feldpausch, Oliver L. Phillips, Simon L. Lewis, Bonaventure Sonké, Herman Taedoumg, Beatriz Schwantes Marimon, Tomas Domingues, Luzmila Arroyo, Gloria Djagbletey, Gustavo Saiz, and France Gerard
Biogeosciences, 19, 1377–1394, https://doi.org/10.5194/bg-19-1377-2022, https://doi.org/10.5194/bg-19-1377-2022, 2022
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The MODIS Vegetation Continuous Fields (VCF) product underestimates tree cover compared to field data and could be underestimating tree cover significantly across the tropics. VCF is used to represent land cover or validate model performance in many land surface and global vegetation models and to train finer-scaled Earth observation products. Because underestimation in VCF may render it unsuitable for training data and bias model predictions, it should be calibrated before use in the tropics.
Lina Teckentrup, Martin G. De Kauwe, Andrew J. Pitman, Daniel S. Goll, Vanessa Haverd, Atul K. Jain, Emilie Joetzjer, Etsushi Kato, Sebastian Lienert, Danica Lombardozzi, Patrick C. McGuire, Joe R. Melton, Julia E. M. S. Nabel, Julia Pongratz, Stephen Sitch, Anthony P. Walker, and Sönke Zaehle
Biogeosciences, 18, 5639–5668, https://doi.org/10.5194/bg-18-5639-2021, https://doi.org/10.5194/bg-18-5639-2021, 2021
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The Australian continent is included in global assessments of the carbon cycle such as the global carbon budget, yet the performance of dynamic global vegetation models (DGVMs) over Australia has rarely been evaluated. We assessed simulations by an ensemble of dynamic global vegetation models over Australia and highlighted a number of key areas that lead to model divergence on both short (inter-annual) and long (decadal) timescales.
Juhwan Lee, Raphael A. Viscarra Rossel, Mingxi Zhang, Zhongkui Luo, and Ying-Ping Wang
Biogeosciences, 18, 5185–5202, https://doi.org/10.5194/bg-18-5185-2021, https://doi.org/10.5194/bg-18-5185-2021, 2021
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We performed Roth C simulations across Australia and assessed the response of soil carbon to changing inputs and future climate change using a consistent modelling framework. Site-specific initialisation of the C pools with measurements of the C fractions is essential for accurate simulations of soil organic C stocks and composition at a large scale. With further warming, Australian soils will become more vulnerable to C loss: natural environments > native grazing > cropping > modified grazing.
Anam M. Khan, Paul C. Stoy, James T. Douglas, Martha Anderson, George Diak, Jason A. Otkin, Christopher Hain, Elizabeth M. Rehbein, and Joel McCorkel
Biogeosciences, 18, 4117–4141, https://doi.org/10.5194/bg-18-4117-2021, https://doi.org/10.5194/bg-18-4117-2021, 2021
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Remote sensing has played an important role in the study of land surface processes. Geostationary satellites, such as the GOES-R series, can observe the Earth every 5–15 min, providing us with more observations than widely used polar-orbiting satellites. Here, we outline current efforts utilizing geostationary observations in environmental science and look towards the future of GOES observations in the carbon cycle, ecosystem disturbance, and other areas of application in environmental science.
Lydia Stolpmann, Caroline Coch, Anne Morgenstern, Julia Boike, Michael Fritz, Ulrike Herzschuh, Kathleen Stoof-Leichsenring, Yury Dvornikov, Birgit Heim, Josefine Lenz, Amy Larsen, Katey Walter Anthony, Benjamin Jones, Karen Frey, and Guido Grosse
Biogeosciences, 18, 3917–3936, https://doi.org/10.5194/bg-18-3917-2021, https://doi.org/10.5194/bg-18-3917-2021, 2021
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Our new database summarizes DOC concentrations of 2167 water samples from 1833 lakes in permafrost regions across the Arctic to provide insights into linkages between DOC and environment. We found increasing lake DOC concentration with decreasing permafrost extent and higher DOC concentrations in boreal permafrost sites compared to tundra sites. Our study shows that DOC concentration depends on the environmental properties of a lake, especially permafrost extent, ecoregion, and vegetation.
Gustaf Granath, Christopher D. Evans, Joachim Strengbom, Jens Fölster, Achim Grelle, Johan Strömqvist, and Stephan J. Köhler
Biogeosciences, 18, 3243–3261, https://doi.org/10.5194/bg-18-3243-2021, https://doi.org/10.5194/bg-18-3243-2021, 2021
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We measured element losses and impacts on water quality following a wildfire in Sweden. We observed the largest carbon and nitrogen losses during the fire and a strong pulse of elements 1–3 months after the fire that showed a fast (weeks) and a slow (months) release from the catchments. Total carbon export through water did not increase post-fire. Overall, we observed a rapid recovery of the biogeochemical cycling of elements within 3 years but still an annual net release of carbon dioxide.
Lina Teckentrup, Martin G. De Kauwe, Andrew J. Pitman, and Benjamin Smith
Biogeosciences, 18, 2181–2203, https://doi.org/10.5194/bg-18-2181-2021, https://doi.org/10.5194/bg-18-2181-2021, 2021
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The El Niño–Southern Oscillation (ENSO) describes changes in the sea surface temperature patterns of the Pacific Ocean. This influences the global weather, impacting vegetation on land. There are two types of El Niño: central Pacific (CP) and eastern Pacific (EP). In this study, we explored the long-term impacts on the carbon balance on land linked to the two El Niño types. Using a dynamic vegetation model, we simulated what would happen if only either CP or EP El Niño events had occurred.
Matthias Volk, Matthias Suter, Anne-Lena Wahl, and Seraina Bassin
Biogeosciences, 18, 2075–2090, https://doi.org/10.5194/bg-18-2075-2021, https://doi.org/10.5194/bg-18-2075-2021, 2021
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Grassland ecosystem services like forage production and greenhouse gas storage in the soil depend on plant growth.
In an experiment in the mountains with warming treatments, we found that despite dwindling soil water content, the grassland growth increased with up to +1.3 °C warming (annual mean) compared to present temperatures. Even at +2.4 °C the growth was still larger than at the reference site.
This suggests that plant growth will increase due to global warming in the near future.
Bernice C. Hwang and Daniel B. Metcalfe
Biogeosciences, 18, 1259–1268, https://doi.org/10.5194/bg-18-1259-2021, https://doi.org/10.5194/bg-18-1259-2021, 2021
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Despite growing recognition of herbivores as important ecosystem engineers, many major gaps remain in our understanding of how silicon and herbivory interact to shape biogeochemical processes. We highlight the need for more research particularly in natural settings as well as on the potential effects of herbivory on terrestrial silicon cycling to understand potentially critical animal–plant–soil feedbacks.
Ali Asaadi and Vivek K. Arora
Biogeosciences, 18, 669–706, https://doi.org/10.5194/bg-18-669-2021, https://doi.org/10.5194/bg-18-669-2021, 2021
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More than a quarter of the current anthropogenic CO2 emissions are taken up by land, reducing the atmospheric CO2 growth rate. This is because of the CO2 fertilization effect which benefits 80 % of global vegetation. However, if nitrogen and phosphorus nutrients cannot keep up with increasing atmospheric CO2, the magnitude of this terrestrial ecosystem service may reduce in future. This paper implements nitrogen constraints on photosynthesis in a model to understand the mechanisms involved.
Arianna Peron, Lisa Kaser, Anne Charlott Fitzky, Martin Graus, Heidi Halbwirth, Jürgen Greiner, Georg Wohlfahrt, Boris Rewald, Hans Sandén, and Thomas Karl
Biogeosciences, 18, 535–556, https://doi.org/10.5194/bg-18-535-2021, https://doi.org/10.5194/bg-18-535-2021, 2021
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Drought events are expected to become more frequent with climate change. Along with these events atmospheric ozone is also expected to increase. Both can stress plants. Here we investigate to what extent these factors modulate the emission of volatile organic compounds (VOCs) from oak plants. We find an antagonistic effect between drought stress and ozone, impacting the emission of different BVOCs, which is indirectly controlled by stomatal opening, allowing plants to control their water budget.
Lena Wohlgemuth, Stefan Osterwalder, Carl Joseph, Ansgar Kahmen, Günter Hoch, Christine Alewell, and Martin Jiskra
Biogeosciences, 17, 6441–6456, https://doi.org/10.5194/bg-17-6441-2020, https://doi.org/10.5194/bg-17-6441-2020, 2020
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Mercury uptake by trees from the air represents an important but poorly quantified pathway in the global mercury cycle. We determined mercury uptake fluxes by leaves and needles at 10 European forests which were 4 times larger than mercury deposition via rainfall. The amount of mercury taken up by leaves and needles depends on their age and growing height on the tree. Scaling up our measurements to the forest area of Europe, we estimate that each year 20 t of mercury is taken up by trees.
A. Anthony Bloom, Kevin W. Bowman, Junjie Liu, Alexandra G. Konings, John R. Worden, Nicholas C. Parazoo, Victoria Meyer, John T. Reager, Helen M. Worden, Zhe Jiang, Gregory R. Quetin, T. Luke Smallman, Jean-François Exbrayat, Yi Yin, Sassan S. Saatchi, Mathew Williams, and David S. Schimel
Biogeosciences, 17, 6393–6422, https://doi.org/10.5194/bg-17-6393-2020, https://doi.org/10.5194/bg-17-6393-2020, 2020
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We use a model of the 2001–2015 tropical land carbon cycle, with satellite measurements of land and atmospheric carbon, to disentangle lagged and concurrent effects (due to past and concurrent meteorological events, respectively) on annual land–atmosphere carbon exchanges. The variability of lagged effects explains most 2001–2015 inter-annual carbon flux variations. We conclude that concurrent and lagged effects need to be accurately resolved to better predict the world's land carbon sink.
Erqian Cui, Chenyu Bian, Yiqi Luo, Shuli Niu, Yingping Wang, and Jianyang Xia
Biogeosciences, 17, 6237–6246, https://doi.org/10.5194/bg-17-6237-2020, https://doi.org/10.5194/bg-17-6237-2020, 2020
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Mean annual net ecosystem productivity (NEP) is related to the magnitude of the carbon sink of a specific ecosystem, while its inter-annual variation (IAVNEP) characterizes the stability of such a carbon sink. Thus, a better understanding of the co-varying NEP and IAVNEP is critical for locating the major and stable carbon sinks on land. Based on daily NEP observations from eddy-covariance sites, we found local indicators for the spatially varying NEP and IAVNEP, respectively.
Taraka Davies-Barnard, Johannes Meyerholt, Sönke Zaehle, Pierre Friedlingstein, Victor Brovkin, Yuanchao Fan, Rosie A. Fisher, Chris D. Jones, Hanna Lee, Daniele Peano, Benjamin Smith, David Wårlind, and Andy J. Wiltshire
Biogeosciences, 17, 5129–5148, https://doi.org/10.5194/bg-17-5129-2020, https://doi.org/10.5194/bg-17-5129-2020, 2020
Rui Cheng, Troy S. Magney, Debsunder Dutta, David R. Bowling, Barry A. Logan, Sean P. Burns, Peter D. Blanken, Katja Grossmann, Sophia Lopez, Andrew D. Richardson, Jochen Stutz, and Christian Frankenberg
Biogeosciences, 17, 4523–4544, https://doi.org/10.5194/bg-17-4523-2020, https://doi.org/10.5194/bg-17-4523-2020, 2020
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We measured reflected sunlight from an evergreen canopy for a year to detect changes in pigments that play an important role in regulating the seasonality of photosynthesis. Results show a strong mechanistic link between spectral reflectance features and pigment content, which is validated using a biophysical model. Our results show spectrally where, why, and when spectral features change over the course of the season and show promise for estimating photosynthesis remotely.
Jarmo Mäkelä, Francesco Minunno, Tuula Aalto, Annikki Mäkelä, Tiina Markkanen, and Mikko Peltoniemi
Biogeosciences, 17, 2681–2700, https://doi.org/10.5194/bg-17-2681-2020, https://doi.org/10.5194/bg-17-2681-2020, 2020
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We assess the relative magnitude of uncertainty sources on ecosystem indicators of the 21st century climate change on two boreal forest sites. In addition to RCP and climate model uncertainties, we included the overlooked model parameter uncertainty and management actions in our analysis. Management was the dominant uncertainty factor for the more verdant southern site, followed by RCP, climate and parameter uncertainties. The uncertainties were estimated with canonical correlation analysis.
Guido Kraemer, Gustau Camps-Valls, Markus Reichstein, and Miguel D. Mahecha
Biogeosciences, 17, 2397–2424, https://doi.org/10.5194/bg-17-2397-2020, https://doi.org/10.5194/bg-17-2397-2020, 2020
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To closely monitor the state of our planet, we require systems that can monitor
the observation of many different properties at the same time. We create
indicators that resemble the behavior of many different simultaneous
observations. We apply the method to create indicators representing the
Earth's biosphere. The indicators show a productivity gradient and a water
gradient. The resulting indicators can detect a large number of changes and
extremes in the Earth system.
Barbara Marcolla, Mirco Migliavacca, Christian Rödenbeck, and Alessandro Cescatti
Biogeosciences, 17, 2365–2379, https://doi.org/10.5194/bg-17-2365-2020, https://doi.org/10.5194/bg-17-2365-2020, 2020
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This work investigates the sensitivity of terrestrial CO2 fluxes to climate drivers. We observed that CO2 flux is mostly controlled by temperature during the growing season and by radiation off season. We also observe that radiation importance is increasing over time while sensitivity to temperature is decreasing in Eurasia. Ultimately this analysis shows that ecosystem response to climate is changing, with potential repercussions for future terrestrial sink and land role in climate mitigation.
Stephanie C. Pennington, Nate G. McDowell, J. Patrick Megonigal, James C. Stegen, and Ben Bond-Lamberty
Biogeosciences, 17, 771–780, https://doi.org/10.5194/bg-17-771-2020, https://doi.org/10.5194/bg-17-771-2020, 2020
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Soil respiration (Rs) is the flow of CO2 from the soil surface to the atmosphere and is one of the largest carbon fluxes on land. This study examined the effect of local basal area (tree area) on Rs in a coastal forest in eastern Maryland, USA. Rs measurements were taken as well as distance from soil collar, diameter, and species of each tree within a 15 m radius. We found that trees within 5 m of our sampling points had a positive effect on how sensitive soil respiration was to temperature.
Keri L. Bowering, Kate A. Edwards, Karen Prestegaard, Xinbiao Zhu, and Susan E. Ziegler
Biogeosciences, 17, 581–595, https://doi.org/10.5194/bg-17-581-2020, https://doi.org/10.5194/bg-17-581-2020, 2020
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We examined the effects of season and tree harvesting on the flow of water and the organic carbon (OC) it carries from boreal forest soils. We found that more OC was lost from the harvested forest because more precipitation reached the soil surface but that during periods of flushing in autumn and snowmelt a limit on the amount of water-extractable OC is reached. These results contribute to an increased understanding of carbon loss from boreal forest soils.
Jason Philip Kaye, Susan L. Brantley, Jennifer Zan Williams, and the SSHCZO team
Biogeosciences, 16, 4661–4669, https://doi.org/10.5194/bg-16-4661-2019, https://doi.org/10.5194/bg-16-4661-2019, 2019
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Interdisciplinary teams can only capitalize on innovative ideas if members work well together through collegial and efficient use of field sites, instrumentation, samples, data, and model code. Thus, biogeoscience teams may benefit from developing a set of best practices for collaboration. We present one such example from a the Susquehanna Shale Hills critical zone observatory. Many of the themes from our example are universal, and they offer insights useful to other biogeoscience teams.
Anne Alexandre, Elizabeth Webb, Amaelle Landais, Clément Piel, Sébastien Devidal, Corinne Sonzogni, Martine Couapel, Jean-Charles Mazur, Monique Pierre, Frédéric Prié, Christine Vallet-Coulomb, Clément Outrequin, and Jacques Roy
Biogeosciences, 16, 4613–4625, https://doi.org/10.5194/bg-16-4613-2019, https://doi.org/10.5194/bg-16-4613-2019, 2019
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This calibration study shows that despite isotope heterogeneity along grass leaves, the triple oxygen isotope composition of bulk leaf phytoliths can be estimated from the Craig and Gordon model, a mixing equation and a mean leaf water–phytolith fractionation exponent (lambda) of 0.521. The results strengthen the reliability of the 17O–excess of phytoliths to be used as a proxy of atmospheric relative humidity and open tracks for its use as an imprint of leaf water 17O–excess.
Lina Teckentrup, Sandy P. Harrison, Stijn Hantson, Angelika Heil, Joe R. Melton, Matthew Forrest, Fang Li, Chao Yue, Almut Arneth, Thomas Hickler, Stephen Sitch, and Gitta Lasslop
Biogeosciences, 16, 3883–3910, https://doi.org/10.5194/bg-16-3883-2019, https://doi.org/10.5194/bg-16-3883-2019, 2019
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This study compares simulated burned area of seven global vegetation models provided by the Fire Model Intercomparison Project (FireMIP) since 1900. We investigate the influence of five forcing factors: atmospheric CO2, population density, land–use change, lightning and climate.
We find that the anthropogenic factors lead to the largest spread between models. Trends due to climate are mostly not significant but climate strongly influences the inter-annual variability of burned area.
Marcos A. S. Scaranello, Michael Keller, Marcos Longo, Maiza N. dos-Santos, Veronika Leitold, Douglas C. Morton, Ekena R. Pinagé, and Fernando Del Bon Espírito-Santo
Biogeosciences, 16, 3457–3474, https://doi.org/10.5194/bg-16-3457-2019, https://doi.org/10.5194/bg-16-3457-2019, 2019
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The coarse dead wood component of the tropical forest carbon pool is rarely measured. For the first time, we developed models for predicting coarse dead wood in Amazonian forests by using airborne laser scanning data. Our models produced site-based estimates similar to independent field estimates found in the literature. Our study provides an approach for estimating coarse dead wood pools from remotely sensed data and mapping those pools over large scales in intact and degraded forests.
James Brennan, Jose L. Gómez-Dans, Mathias Disney, and Philip Lewis
Biogeosciences, 16, 3147–3164, https://doi.org/10.5194/bg-16-3147-2019, https://doi.org/10.5194/bg-16-3147-2019, 2019
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We estimate the uncertainties associated with three global satellite-derived burned area estimates. The method provides unique uncertainties for the three estimates at the global scale for 2001–2013. We find uncertainties of 4 %–5.5 % in global burned area and uncertainties of 8 %–10 % in the frequently burning regions of Africa and Australia.
Alexander J. Norton, Peter J. Rayner, Ernest N. Koffi, Marko Scholze, Jeremy D. Silver, and Ying-Ping Wang
Biogeosciences, 16, 3069–3093, https://doi.org/10.5194/bg-16-3069-2019, https://doi.org/10.5194/bg-16-3069-2019, 2019
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This study presents an estimate of global terrestrial photosynthesis. We make use of satellite chlorophyll fluorescence measurements, a visible indicator of photosynthesis, to optimize model parameters and estimate photosynthetic carbon uptake. This new framework incorporates nonlinear, process-based understanding of the link between fluorescence and photosynthesis, an advance on past approaches. This will aid in the utility of fluorescence to quantify terrestrial carbon cycle feedbacks.
Sophie V. J. van der Horst, Andrew J. Pitman, Martin G. De Kauwe, Anna Ukkola, Gab Abramowitz, and Peter Isaac
Biogeosciences, 16, 1829–1844, https://doi.org/10.5194/bg-16-1829-2019, https://doi.org/10.5194/bg-16-1829-2019, 2019
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Measurements of surface fluxes are taken around the world and are extremely valuable for understanding how the land and atmopshere interact, and how the land can amplify temerature extremes. However, do these measurements sample extreme temperatures, or are they biased to the average? We examine this question and highlight data that do measure surface fluxes under extreme conditions. This provides a way forward to help model developers improve their models.
Boaz Hilman, Jan Muhr, Susan E. Trumbore, Norbert Kunert, Mariah S. Carbone, Päivi Yuval, S. Joseph Wright, Gerardo Moreno, Oscar Pérez-Priego, Mirco Migliavacca, Arnaud Carrara, José M. Grünzweig, Yagil Osem, Tal Weiner, and Alon Angert
Biogeosciences, 16, 177–191, https://doi.org/10.5194/bg-16-177-2019, https://doi.org/10.5194/bg-16-177-2019, 2019
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Combined measurement of CO2 / O2 fluxes in tree stems suggested that on average 41 % of the respired CO2 was not emitted locally to the atmosphere. This finding strengthens the recognition that CO2 efflux from tree stems is not an accurate measure of respiration. The CO2 / O2 fluxes did not vary as expected if CO2 dissolution in the xylem sap was the main driver for the CO2 retention. We suggest the examination of refixation of respired CO2 as a possible mechanism for CO2 retention.
Gitta Lasslop, Thomas Moeller, Donatella D'Onofrio, Stijn Hantson, and Silvia Kloster
Biogeosciences, 15, 5969–5989, https://doi.org/10.5194/bg-15-5969-2018, https://doi.org/10.5194/bg-15-5969-2018, 2018
Short summary
Short summary
We apply a multivariate model evaluation to the relationship between climate, vegetation and fire in the tropics using the JSBACH land surface model and two remote-sensing data sets, with the aim to identify the potential for model improvement. The overestimation of tree cover for low precipitation and a very strong relationship between tree cover and burned area indicates opportunities in the improvement of drought effects and the impact of fire on tree cover or the adaptation of trees to fire.
Yao Zhang, Joanna Joiner, Seyed Hamed Alemohammad, Sha Zhou, and Pierre Gentine
Biogeosciences, 15, 5779–5800, https://doi.org/10.5194/bg-15-5779-2018, https://doi.org/10.5194/bg-15-5779-2018, 2018
Short summary
Short summary
Using satellite reflectance measurements and a machine learning algorithm, we generated a new solar-induced chlorophyll fluorescence (SIF) dataset that is closely linked to plant photosynthesis. This new dataset has higher spatial and temporal resolutions, and lower uncertainty compared to the existing satellite retrievals. We also demonstrated its application in monitoring drought and improving the understanding of the SIF–photosynthesis relationship.
Cited articles
Abaker, W. E., Berninger, F., Saiz, G., Braojos, V., and Starr, M.: Contribution
of Acacia senegal to biomass and soil carbon in plantations of varying age
in Sudan, Forest Ecol. Manag., 368, 71–80,
https://doi.org/10.1016/j.foreco.2016.03.003, 2016.
Abaker, W. E., Berninger, F., Saiz, G., Pumpanen, J., and Starr, M.: Linkages
between soil carbon, soil fertility and nitrogen fixation in Acacia senegal
plantations of varying age in Sudan, PeerJ, 6, e5232,
https://doi.org/10.7717/peerj.5232, 2018.
Acton, P., Fox, J., Campbell, E., Rowe, H., and Wilkinson, M.:
Carbon isotopes for estimating soil decomposition and physical mixing in
well-drained forest soils, J. Geophys. Res.-Biogeo., 118, 1532–1545, 2013.
Amundson, R., Austin, A. T., Schuur, E. A. G., Yoo, K., Matzek, V., Kendall,
C., Uebersax, A., Brenner, D., and Baisden, W. T.: Global patterns of the
isotopic composition of soil and plant nitrogen, Global Biogeochem. Cy., 17,
1031, https://doi.org/10.1029/2002GB001903, 2003.
Appelhans, T., Mwangomo, E., Otte, I., Detsch, F., Nauss, T., and Hemp, A.:
Eco-meteorological characteristics of the southern slopes of Kilimanjaro,
Tanzania, Int. J. Climatol., 36, 3245–3258, https://doi.org/10.1002/joc.4552, 2016.
Aranibar, J. N., Otter, L., Macko, S. A., Feral, C. J., Epstein, H. E.,
Dowty, P. R., Eckardt, F., Shugart, H. H., and Swap, R. J.: Nitrogen cycling
in the soil–plant system along a precipitation gradient in the Kalahari
sands, Glob. Change Biol., 10, 359-373.
https://doi.org/10.1111/j.1365-2486.2003.00698.x, 2004.
Aranibar, J. N., Anderson, I. C., Epstein, H. E., Feral, C. J. W., Swap, R. J.,
Ramontsho, J., and Macko, S. A.: Nitrogen isotope composition of soils, C3 and
C4
plants along land use gradients in southern Africa, J. Arid Environ., 72,
326–337, https://doi.org/10.1016/j.jaridenv.2007.06.007, 2008.
Bai, E., Houlton, B. Z., and Wang, Y. P.: Isotopic identification of nitrogen
hotspots across natural terrestrial ecosystems, Biogeosciences, 9,
3287–3304, https://doi.org/10.5194/bg-9-3287-2012, 2012.
Bateman, A. S. and Kelly, S. D.: Fertilizer nitrogen isotope signatures,
Isot. Environ. Heal. S., 43, 237–247, 2007.
Bauters, M., Drake, T. W., Verbeeck, H., Bodé, S.,
Hervé-Fernández, P., Zito, P., Podgorski, D. C., Boyemba, F.,
Makelele, I., Ntaboba, L. C., Spencer, R. G. M., and Boeckx, P.: High
fire-derived nitrogen deposition on central African forests, P. Natl. Acad.
Sci. USA, 115, 549–554, https://doi.org/10.1073/pnas.1714597115, 2018.
Becker, J., Pabst, H., Mnyonga, J., and Kuzyakov, Y.: Annual litterfall
dynamics and nutrient deposition depending on elevation and land use at Mt.
Kilimanjaro, Biogeosciences, 12, 5635–5646,
https://doi.org/10.5194/bg-12-5635-2015, 2015.
Becker, J. N. and Kuzyakov, Y.: Teatime on Mount Kilimanjaro: Assessing
climate and land-use effects on litter decomposition and stabilization using
the Tea Bag Index, Land Degrad. Dev., 29, 2321–2329, 2018.
Bedard-Haughn, A., van Groenigen, J. W., and van Kessel, C.: Tracing
15N through landscapes: potential uses and precautions, J. Hydrol.,
272, 175–190, https://doi.org/10.1016/S0022-1694(02)00263-9, 2003.
Benner, R., Fogel, M. L., Sprague, E. K., and Hodson, R. E.: Depletion of
13C in lignin and its implications for stable carbon isotope
studies, Nature, 329, 708–710, https://doi.org/10.1038/329708a0, 1987.
Bird, M. I., Haberle, S. G., and Chivas, A. R.: Effect of altitude on the
carbon-isotope composition of forest and grassland soils from Papua New
Guinea, Global Biogeochem. Cy., 8, 13–22, https://doi.org/10.1029/93GB03487, 1994.
Bird, M. I. and Pousai, P.: Variations of δ13C in the surface
soil organic carbon pool, Global Biogeochem. Cy., 11, 313–322,
https://doi.org/10.1029/97GB01197, 1997.
Bird, M. I., Veenendaal, E. M., and Lloyd, J. J.: Soil carbon inventories and
δ13C along a moisture gradient in Botswana, Glob. Change
Biol., 10, 342–349, https://doi.org/10.1046/j.1365-2486.2003.00695.x, 2004.
Blagodatskaya, E., Blagodatsky, S., Khomyakov, N., Myachina, O., and
Kuzyakov, Y.: Temperature sensitivity and enzymatic mechanisms of soil
organic matter decomposition along an altitudinal gradient on Mount
Kilimanjaro, Sci. Rep.-UK, 6, 22240, https://doi.org/10.1038/srep22240, 2016.
Booth, M. S., Stark, J. M., and Rastetter, E.: Controls on Nitrogen Cycling
in Terrestrial Ecosystems: A Synthetic Analysis of Literature Data, Ecol.
Monogr., 75, 139–157, https://doi.org/10.1890/04-0988, 2005.
Borken, W. and Matzner, E.: Reappraisal of drying and wetting effects on C
and N mineralization and fluxes in soils, Glob. Change Biol., 15, 808–824,
https://doi.org/10.1111/j.1365-2486.2008.01681.x, 2009.
Butterbach-Bahl, K. and Dannenmann, M.: Soil Carbon and Nitrogen Interactions
and Biosphere-Atmosphere Exchange of Nitrous Oxide and Methane, in:
Recarbonization of the Biosphere, edited by: Lal, R., Lorenz, K., Hüttl,
R. F., Schneider, B. U., and von Brau, J., Springer, the Netherlands,
429–443, 2012.
Cernusak, L. A., Ubierna, N., Winter, K., Holtum, J. A. M., Marshall, J. D.,
and Farquhar, G. D.: Environmental and physiological determinants of carbon
isotope discrimination in terrestrial plants, New Phytol., 200, 950–965,
https://doi.org/10.1111/nph.12423, 2013.
Conen, F., Yakutin, M. V., Carle, N., and Alewell, C.: δ15N
natural abundance may directly disclose perturbed soil when related to
C : N ratio, Rapid Commun. Mass Sp., 27, 1101–1104, https://doi.org/10.1002/rcm.6552,
2013.
Craine, J. M., Brookshire, E. N. J., Cramer, M. D., Hasselquist, N. J., Koba,
K., Marin-Spiotta, E., and Wang, L.: Ecological interpretations of nitrogen
isotope ratios of terrestrial plants and soils, Plant Soil, 396, 1–26,
https://doi.org/10.1007/s11104-015-2542-1, 2015a.
Craine, J. M., Elmore, A. J., Wang, L., Augusto, L., Baisden, W. T.,
Brookshire, E. N. J., Cramer, M. D., Hasselquist, N. J., Hobbie, E. A.,
Kahmen, A., Koba, K., Kranabetter, J. M., Mack, M. C., Marin-Spiotta, E.,
Mayor, J. R., McLauchlan, K. K., Michelsen, A., Nardoto, G. B., Oliveira, R.
S., Perakis, S. S., Peri, P. L., Quesada, C. A., Richter, A., Schipper, L.
A., Stevenson, B. A., Turner, B. L., Viani, R. A. G., Wanek, W., and Zeller,
B.: Convergence of soil nitrogen isotopes across global climate gradients,
Sci. Rep.-UK, 5, 8280, https://doi.org/10.1038/srep08280, 2015b.
Dawson, T. E., Mambelli, S., Plamboeck, A. H., Templer, P. H., and Tu, K. P.:
Stable Isotopes in Plant Ecology, Annu. Rev. Ecol. Syst., 33, 507–559,
https://doi.org/10.1146/annurev.ecolsys.33.020602.095451, 2002.
de Freitas, A. D. S., de Sá Barretto Sampaio, E. V., de Souza Ramos, A.
P., de Vasconcellos Barbosa, M. R., Lyra, R. P., and Araújo, E. L.:
Nitrogen isotopic patterns in tropical forests along a rainfall gradient in
Northeast Brazil, Plant Soil, 391, 109–122, https://doi.org/10.1007/s11104-015-2417-5,
2015.
Denk, T. R. A., Mohn, J., Decock, C., Lewicka-Szczebak, D., Harris, E.,
Butterbach-Bahl, K., Kiese, R., and Wolf, B.: The nitrogen cycle: A review of
isotope effects and isotope modeling approaches, Soil Biol. Biochem., 105,
121–137, https://doi.org/10.1016/j.soilbio.2016.11.015, 2017.
Duane, W., Pepin, N., Losleben, M., and Hardy, D.: General Characteristics of
Temperature and Humidity Variability on Kilimanjaro, Tanzania, Arct. Antarct.
Alp. Res., 40, 323–334, 2008.
Ensslin, A., Rutten, G., Pommer, U., Zimmermann, R., Hemp, A., and Fischer,
M.: Effects of elevation and land use on the biomass of trees, shrubs and
herbs at Mount Kilimanjaro, Ecosphere, 6, 1–15, https://doi.org/10.1890/ES14-00492.1,
2015.
Eshetu, Z. and Högberg, P.: Effects of land use on 15N natural
abundance of soils in Ethiopian highlands, Plant Soil, 222, 109–117, 2000.
FAO and JRC: Global forest land-use change 1990–2005, in: FAO Forestry Paper
No. 16, edited by: Lindquist, E. J., D'Annunzio, R., Gerrand, A., MacDicken,
K., Achard, F., Beuchle, R., Brink, A., Eva, H. D., Mayaux, P.,
San-Miguel-Ayanz, J., and Stibig, H.-J., Food and Agriculture Organization of
the United Nations and European Comission Joint Research Centre, Rome, FAO,
2012.
Farquhar, G. D. and Sharkey, T. D.: Stomatal Conductance and Photosynthesis,
Annu. Rev. Plant Phys., 33, 317–345,
https://doi.org/10.1146/annurev.pp.33.060182.001533, 1982.
Farquhar, G. D., von Caemmerer, S., and Berry, J. A.: A biochemical model of
photosynthetic CO2 assimilation in leaves of C3 species,
Planta, 149, 78–90, https://doi.org/10.1007/BF00386231, 1980.
Garten, J. C., Hanson, P., Todd, J. D., Lu, B., and Brice, D.: Natural
15N and 13C abundance as indicators of forest N status
and soil C dynamics, in: Stable Isotopes in Ecology and Environmental
Science, second ed., edited by: Michener, R., Lajtha, K., Blackwell Science,
Oxford, 61–82, 2008.
Garten, C. T., Classen, A. T., and Norby, R. J.: Soil moisture surpasses
elevated CO2 and temperature as a control on soil carbon dynamics in
a multi-factor climate change experiment, Plant Soil, 319, 85–94,
https://doi.org/10.1007/s11104-008-9851-6, 2009.
Gerschlauer, F. and Kiese, R.: SP3_d15N/d13C natural abundance, TN, and SOC,
https://www.kilimanjaro.biozentrum.uni-wuerzburg.de/Data/Data.aspx,
last access: 31 August 2016.
Gerschlauer, F., Dannenmann, M., Kühnel, A., Meier, R., Kolar, A.,
Butterbach-Bahl, K., and Kiese, R.: Gross Nitrogen Turnover of Natural and
Managed Tropical Ecosystems at Mt. Kilimanjaro, Tanzania, Ecosystems, 19,
1–18, https://doi.org/10.1007/s10021-016-0001-3, 2016.
Gruber, N. and Galloway, J. N.: An Earth-system perspective of the global
nitrogen cycle, Nature, 451, 293–296, https://doi.org/10.1038/nature06592, 2008.
Gütlein, A., Zistl-Schlingmann, M., Becker, J. N., Cornejo, N. S.,
Detsch, F., Dannenmann, M., Appelhans, T., Hertel, D., Kuzyakov, Y., and
Kiese, R.: Nitrogen turnover and greenhouse gas emissions in a tropical
alpine ecosystem, Mt. Kilimanjaro, Tanzania, Plant Soil, 411, 243–259,
https://doi.org/10.1007/s11104-016-3029-4, 2017.
Gütlein, A., Gerschlauer, F., Kikoti, I., and Kiese, R.: Impacts of
climate and land use on N2O and CH4 fluxes from tropical
ecosystems in the Mt. Kilimanjaro region, Tanzania, Glob. Change Biol., 24,
1239–1255, https://doi.org/10.1111/gcb.13944, 2018.
Hedin, L. O., Brookshire, E. N. J., Menge, D. N. L., and Barron, A. R.: The
Nitrogen Paradox in Tropical Forest Ecosystems, Annu. Rev. Ecol. Evol. S.,
40, 613–635, https://doi.org/10.1146/annurev.ecolsys.37.091305.110246, 2009.
Hemp, A.: Climate change-driven forest fires marginalize the impact of ice
cap wasting on Kilimanjaro, Glob. Change Biol., 11, 1013–1023,
https://doi.org/10.1111/j.1365-2486.2005.00968.x, 2005.
Hickman, J. E., Palm, C. A., Mutuo, P., Melillo, J. M., and Tang, J.: Nitrous
oxide (N2O) emissions in response to increasing fertilizer addition
in maize (Zea mays L.) agriculture in western Kenya, Nutr. Cycl. Agroecosys.,
100, 177–187, https://doi.org/10.1007/s10705-014-9636-7, 2014.
Högberg, P.: 15N natural abundance in soil-plant systems,
Tansley Review No. 95, New Phytol., 137, 179–203,
https://doi.org/10.1046/j.1469-8137.1997.00808.x, 1997.
Houlton, B. Z. and Bai, E.: Imprint of denitrifying bacteria on the global
terrestrial biosphere, P. Natl. Acad. Sci. USA, 106, 21713–21716,
https://doi.org/10.1073/pnas.0912111106, 2009.
Kirschbaum, M. U. F.: The temperature dependence of soil organic matter
decomposition, and the effect of global warming on soil organic C storage,
Soil Biol. Biochem., 27, 753–760, https://doi.org/10.1016/0038-0717(94)00242-S, 1995.
Kohn, M. J.: Carbon isotope compositions of terrestrial C3 plants as
indicators of (paleo)ecology and (paleo)climate, P. Natl. Acad. Sci. USA,
107, 19691–19695, https://doi.org/10.1073/pnas.1004933107, 2010.
Körner, C., Farquhar, G. D., and Wong, S. C.: Carbon Isotope
Discrimination by Plants Follows Latitudinal and Altitudinal Trends,
Oecologia, 88, 30–40, 1991.
Leirós, M. C., Trasar-Cepeda, C., Seoane, S., and Gil-Sotres, F.:
Dependence of mineralization of soil organic matter on temperature and
moisture, Soil Biol. Biochem., 31, 327–335,
https://doi.org/10.1016/S0038-0717(98)00129-1, 1999.
Lewis, S. L., Lloyd, J., Sitch, S., Mitchard, E. T. A., and Laurance, W. F.:
Changing Ecology of Tropical Forests: Evidence and Drivers, Annu. Rev. Ecol.
Evol. S., 40, 529–549, https://doi.org/10.1146/annurev.ecolsys.39.110707.173345, 2009.
Ma, J.-Y., Sun, W., Liu, X.-N., and Chen, F.-H.: Variation in the Stable
Carbon and Nitrogen Isotope Composition of Plants and Soil along a
Precipitation Gradient in Northern China, PLOS ONE, 7, e51894,
https://doi.org/10.1371/journal.pone.0051894, 2012.
Majule, A. E.: Impacts of Land Use/Land Cover Changes on Soil Degradation and
Biodiversity on the Slopes of Mount Kilimanjaro, Tanzania, LUCID Project,
International Livestock Research Institute, 2003.
Mariotti, A., Germon, J. C., Hubert, P., Kaiser, P., Letolle, R., Tardieux,
A., and Tardieux, P.: Experimental determination of nitrogen kinetic isotope
fractionation: some principles; illustration for the denitrification and
nitrification processes, Plant Soil, 62, 413–430, 1981.
Martinelli, L. A., Piccolo, M. C., Townsend, A. R., Vitousek, P. M., Cuevas,
E., McDowell, W., Robertson, G. P., Santos, O. C., and Treseder, K.: Nitrogen
stable isotopic composition of leaves and soil: Tropical versus temperate
forests, Biogeochemistry, 46, 45–65, https://doi.org/10.1007/BF01007573, 1999.
Mganga, K. Z. and Kuzyakov, Y.: Glucose decomposition and its incorporation
into soil microbial biomass depending on land use in Mt. Kilimanjaro
ecosystems, Eur. J. Soil Biol., 62, 74–82, 2014.
Michener, R. H. and Lajtha, K. (Eds.): Stable isotopes in ecology and
environmental science, 2nd ed., Ecological methods and concepts series,
Blackwell Pub, Malden, MA, 2007.
Nardoto, G. B., Quesada, C. A., Patiño, S., Saiz, G., Baker, T. R.,
Schwarz, M., Schrodt, F., Feldpausch, T. R., Domingues, T. F., Marimon, B.
S., Junior, B.-H. M., Vieira, I. C. G., Silveira, M., Bird, M. I., Phillips,
O. L., Lloyd, J., and Martinelli, L. A.: Basin-wide variations in Amazon
forest nitrogen-cycling characteristics as inferred from plant and soil
15N :14N measurements, Plant Ecol. Divers., 7, 173–187,
https://doi.org/10.1080/17550874.2013.807524, 2014.
Ometto, J. P. H. B., Ehleringer, J. R., Domingues, T. F., Berry, J. A.,
Ishida, F. Y., Mazzi, E., Higuchi, N., Flanagan, L. B., Nardoto, G. B., and
Martinelli, L. A.: The stable carbon and nitrogen isotopic composition of
vegetation in tropical forests of the Amazon Basin, Brazil, Biogeochemistry,
79, 251–274, https://doi.org/10.1007/s10533-006-9008-8, 2006.
Ortiz, C., Vázquez, E., Rubio, A., Benito, M., Schindlbacher, A., Jandl,
R., Butterbach-Bahl, K., and Díaz-Pinés, E.: Soil organic matter
dynamics after afforestation of mountain grasslands in both a Mediterranean
and a temperate climate, Biogeochemistry, 131, 267–280,
https://doi.org/10.1007/s10533-016-0278-5, 2016.
Pan, Y., Birdsey, R. A., Fang, J., Houghton, R., Kauppi, P. E., Kurz, W. A.,
Phillips, O. L., Shvidenko, A., Lewis, S. L., Canadell, J. G., Ciais, P.,
Jackson, R. B., Pacala, S. W., McGuire, A. D., Piao, S., Rautiainen, A.,
Sitch, S., and Hayes, D.: A Large and Persistent Carbon Sink in the World's
Forests, Science, 333, 988–993, https://doi.org/10.1126/science.1201609, 2011.
Panettieri, M., Rumpel, C., Dignac, M. F., and Chabbi, A.: Does grassland
introduction into cropping cycles affect carbon dynamics through changes of
allocation of soil organic matter within aggregate fractions?, Sci. Total
Environ., 576, 251–263, 2017.
Pardo, L. H. and Nadelhoffer, K. J.: Using Nitrogen Isotope Ratios to Assess
Terrestrial Ecosystems at Regional and Global Scales, in: Isoscapes, edited
by: West, J. B., Bowen, G. J., Dawson, T. E., and Tu, K. P., Springer, the
Netherlands, Dordrecht, 221–249, 2010.
Peterson, B. J. and Fry, B.: Stable Isotopes in Ecosystem Studies, Annu. Rev.
Ecol. Syst., 18, 293–320, https://doi.org/10.1146/annurev.es.18.110187.001453, 1987.
Piccolo, M. C., Neill, C., Melillo, J. M., Cerri, C. C., and Steudler, P. A.:
15N natural abundance in forest and pasture soils of the Brazilian
Amazon Basin, Plant Soil, 182, 249–258, https://doi.org/10.1007/BF00029056, 1996.
R Core Team: R: A language and environment for statistical computing, R
Foundation for Statistical Computing, Vienna, Austria, 2015.
Robinson, D.: δ15N as an integrator of the nitrogen cycle,
Trends Ecol. Evol., 16, 153–162, https://doi.org/10.1016/S0169-5347(00)02098-X, 2001.
Saiz, G. and Albrecht, A.: Methods for smallholder quantification of soil
carbon stocks and stock changes, in: Measurement methods Standard
Assessment Of Agricultural Mitigation Potential And Livelihoods (SAMPLES),
edited by: Rosenstock, T. S., Rufino, M. C., Butterbach-Bahl, K., Wollenberg,
E., and Richards, M., ISBN 978-3-319-29792-7, CGIAR Research Program on
Climate Change, Agriculture and Food Security, 135–162, 2016.
Saiz, G., Bird, M., Domingues, T., Schrodt, F., Schwarz, M., Feldpausch, T.,
Veenendaal, E., Djagbletey, G., Hien, F., Compaore, H., Diallo, A., and
Lloyd, J.: Variation in soil carbon stocks and their determinants across a
precipitation gradient in West Africa, Glob. Change Biol., 18, 1670–1683,
https://doi.org/10.1111/j.1365-2486.2012.02657.x, 2012.
Saiz, G., Bird, M., Wurster, C., Quesada, C. A., Ascough, P., Domingues, T.,
Schrodt, F., Schwarz, M., Feldpausch, T. R., Veenendaal, E., Djagbletey, G.,
Jacobsen, G., Hien, F., Compaore, H., Diallo, A., and Lloyd, J.: The
influence of C3 and C4 vegetation on soil organic matter dynamics
in contrasting semi-natural tropical ecosystems, Biogeosciences, 12,
5041–5059, https://doi.org/10.5194/bg-12-5041-2015, 2015a.
Saiz, G., Wynn, J. G., Wurster, C. M., Goodrick, I., Nelson, P. N., and Bird,
M. I.: Pyrogenic carbon from tropical savanna burning: production and stable
isotope composition, Biogeosciences, 12, 1849–1863,
https://doi.org/10.5194/bg-12-1849-2015, 2015b.
Saiz, G., Wandera, F. M., Pelster, D. E., Ngetich, W., Okalebo, J. R.,
Rufino, M. C., and Butterbach-Bahl, K.: Long-term assessment of soil and
water conservation measures (Fanya-juu terraces) on soil organic matter in
South Eastern Kenya, Geoderma, 274, 1–9, https://doi.org/10.1016/j.geoderma.2016.03.022,
2016.
Saiz, G., Goodrick, I., Wurster, C., Nelson, P. N., Wynn, J., and Bird, M.:
Preferential Production and Transport of Grass-Derived Pyrogenic Carbon in
NE-Australian Savanna Ecosystems, Front. Earth Sci., 5, 115,
https://doi.org/10.3389/feart.2017.00115, 2018.
Schellenberger Costa, D., Gerschlauer, F., Pabst, H., Kühnel, A., Huwe,
B., Kiese, R., Kuzyakov, Y., Kleyer, M., and Kühn, I.: Community-weighted
means and functional dispersion of plant functional traits along
environmental gradients on Mount Kilimanjaro, J. Veg. Sci., 28, 684–695,
https://doi.org/10.1111/jvs.12542, 2017.
Smith, P., Clark, H., Dong, H., Elsiddig, E.A., Haberl, H., Harper, R.,
House, J., Jafari, M., Masera, O., Mbow, C., Ravindranath, N. H., Rice, C.
W., Roble do Abad, C., Romanovskaya, A., Sperling, F., and Tubiello, F.:
Chapter 11 – Agriculture, forestry and other land use (AFOLU), in: Climate
Change 2014: Mitigation of Climate Change, IPCC Working Group III
Contribution to AR5, Cambridge University Press, 2014.
Soini, E.: Land use change patterns and livelihood dynamics on the slopes of
Mt. Kilimanjaro, Tanzania, Agric. Syst., 85, 306–323,
https://doi.org/10.1016/j.agsy.2005.06.013, 2005.
Sotta, E. D., Corre, M. D., and Veldkamp, E.: Differing N status and N
retention processes of soils under old-growth lowland forest in Eastern
Amazonia, Caxiuanã, Brazil, Soil Biol. Biochem., 40, 740–750,
https://doi.org/10.1016/j.soilbio.2007.10.009, 2008.
Stevenson, B. A., Parfitt, R. L., Schipper, L. A., Baisden, W. T., and Mudge,
P.: Relationship between soil δ15N, C∕N and N
losses across land uses in New Zealand, Agr. Ecosyst. Environ., 139,
736–741, https://doi.org/10.1016/j.agee.2010.10.020, 2010.
Swap, R. J., Aranibar, J. N., Dowty, P. R., Gilhooly, W. P., and Macko, S.
A.: Natural abundance of 13C and 15N in C3 and
C4 vegetation of southern Africa: patterns and implications, Glob.
Change Biol., 10, 350–358, https://doi.org/10.1111/j.1365-2486.2003.00702.x, 2004.
Tieszen, L. L., Senyimba, M. M., Imbamba, S. K., and Troughton, J. H.: The
distribution of C3 and C4 grasses and carbon isotope discrimination
along an altitudinal and moisture gradient in Kenya, Oecologia, 37, 337–350,
https://doi.org/10.1007/BF00347910, 1979.
Townsend, A. R., Cleveland, C. C., Houlton, B. Z., Alden, C. B., and White,
J. W.: Multi-element regulation of the tropical forest carbon cycle, Front.
Ecol. Environ., 9, 9–17, https://doi.org/10.1890/100047, 2011.
Traoré, S., Ouattara, K., Ilstedt, U., Schmidt, M., Thiombiano, A.,
Malmer, A., and Nyberg, G.: Effect of land degradation on carbon and nitrogen
pools in two soil types of a semi-arid landscape in West Africa, Geoderma,
241–242, 330–338, https://doi.org/10.1016/j.geoderma.2014.11.027, 2015.
van der Merwe, N. J. and Medina, E.: Photosynthesis and 13C12C
ratios in Amazonian rain forests, Geochim. Cosmochim. Ac., 53, 1091–1094,
https://doi.org/10.1016/0016-7037(89)90213-5, 1989.
van Reeuwijk, L. (Ed.): Procedures for Soil Analysis 9, Technical Paper,
International Soil Reference and Information Centre, Wageningen, 2002.
Vitousek, P. M.: Litterfall, Nutrient Cycling, and Nutrient Limitation in
Tropical Forests, Ecology, 65, 285–298, https://doi.org/10.2307/1939481, 1984.
Wang, C., Houlton, B. Z., Liu, D., Hou, J., Cheng, W., and Bai, E.: Stable
isotopic constraints on global soil organic carbon turnover, Biogeosciences,
15, 987–995, https://doi.org/10.5194/bg-15-987-2018, 2018.
Wang, L., D'Odorico, P., Ries, L., and Macko, S. A.: Patterns and
implications of plant-soil δ13C and δ15N values
in African savanna ecosystems, Quaternary Res., 73, 77–83,
https://doi.org/10.1016/j.yqres.2008.11.004, 2010.
Wynn, J. G. and Bird, M. I.: C4-derived soil organic carbon decomposes
faster than its C3 counterpart in mixed C3∕C4 soils, Glob.
Change Biol., 13, 2206–2217, https://doi.org/10.1111/j.1365-2486.2007.01435.x, 2007.
Zaehle, S.: Terrestrial nitrogen–carbon cycle interactions at the global
scale, Philos. T. R. Soc. B, 368, 20130125, https://doi.org/10.1098/rstb.2013.0125, 2013.
Zech, M., Bimüller, C., Hemp, A., Samimi, C., Broesike, C., Hörold,
C., and Zech, W.: Human and climate impact on 15N natural abundance
of plants and soils in high-mountain ecosystems: a short review and two
examples from the Eastern Pamirs and Mt. Kilimanjaro, Isotopes Environ.
Health Stud., 47, 286–296, https://doi.org/10.1080/10256016.2011.596277, 2011.
Zhou, Y., Fan, J., Zhang, W., Harris, W., Zhong, H., Hu, Z., and Song, L.:
Factors influencing altitudinal patterns of C3 plant foliar carbon
isotope composition of grasslands on the Qinghai-Tibet Plateau, China, Alpine
Bot., 121, 79, https://doi.org/10.1007/s00035-011-0093-5, 2011.
Zhu, Y., Jiang, Y., Liu, Q., Kang, M., Spehn, E. M., and Körner, C.:
Elevational Trends of Biodiversity and Plant Traits Do Not Converge – A Test
in the Helan Range, NW China, Plant Ecol., 205, 273–283, 2009.
Short summary
Mount Kilimanjaro is an iconic environmental asset under serious threat due to increasing human pressures and climate change constraints. We studied variations in the stable isotopic composition of carbon and nitrogen in plant, litter, and soil material sampled along a strong land-use and altitudinal gradient. Our results show that, besides management, increasing temperatures in a changing climate may promote carbon and nitrogen losses, thus altering the stability of Kilimanjaro ecosystems.
Mount Kilimanjaro is an iconic environmental asset under serious threat due to increasing human...
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