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BG | Volume 15, issue 21
Biogeosciences, 15, 6621–6635, 2018
https://doi.org/10.5194/bg-15-6621-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-15-6621-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Biogeosciences, 15, 6621–6635, 2018
https://doi.org/10.5194/bg-15-6621-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-15-6621-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article 08 Nov 2018
Research article | 08 Nov 2018
Impacts of temperature and soil characteristics on methane production and oxidation in Arctic tundra
Jianqiu Zheng et al.Related authors
Jianqiu Zheng, Peter E. Thornton, Scott L. Painter, Baohua Gu, Stan D. Wullschleger, and David E. Graham
Biogeosciences, 16, 663–680, https://doi.org/10.5194/bg-16-663-2019, https://doi.org/10.5194/bg-16-663-2019, 2019
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Arctic warming exposes soil carbon to increased degradation, increasing CO2 and CH4 emissions. Models underrepresent anaerobic decomposition that predominates wet soils. We simulated microbial growth, pH regulation, and anaerobic carbon decomposition in a new model, parameterized and validated with prior soil incubation data. The model accurately simulated CO2 production and strong influences of water content, pH, methanogen biomass, and competing electron acceptors on CH4 production.
Guoping Tang, Jianqiu Zheng, Xiaofeng Xu, Ziming Yang, David E. Graham, Baohua Gu, Scott L. Painter, and Peter E. Thornton
Biogeosciences, 13, 5021–5041, https://doi.org/10.5194/bg-13-5021-2016, https://doi.org/10.5194/bg-13-5021-2016, 2016
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We extend the Community Land Model coupled with carbon and nitrogen (CLM-CN) decomposition cascade to include simple organic substrate turnover, fermentation, Fe(III) reduction, and methanogenesis reactions, and assess the efficacy of various temperature and pH response functions. Incorporating the Windermere Humic Aqueous Model (WHAM) describes the observed pH evolution. Fe reduction can increase pH toward neutral pH to facilitate methanogenesis.
Jianqiu Zheng, Peter E. Thornton, Scott L. Painter, Baohua Gu, Stan D. Wullschleger, and David E. Graham
Biogeosciences, 16, 663–680, https://doi.org/10.5194/bg-16-663-2019, https://doi.org/10.5194/bg-16-663-2019, 2019
Short summary
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Arctic warming exposes soil carbon to increased degradation, increasing CO2 and CH4 emissions. Models underrepresent anaerobic decomposition that predominates wet soils. We simulated microbial growth, pH regulation, and anaerobic carbon decomposition in a new model, parameterized and validated with prior soil incubation data. The model accurately simulated CO2 production and strong influences of water content, pH, methanogen biomass, and competing electron acceptors on CH4 production.
Guoping Tang, Jianqiu Zheng, Xiaofeng Xu, Ziming Yang, David E. Graham, Baohua Gu, Scott L. Painter, and Peter E. Thornton
Biogeosciences, 13, 5021–5041, https://doi.org/10.5194/bg-13-5021-2016, https://doi.org/10.5194/bg-13-5021-2016, 2016
Short summary
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We extend the Community Land Model coupled with carbon and nitrogen (CLM-CN) decomposition cascade to include simple organic substrate turnover, fermentation, Fe(III) reduction, and methanogenesis reactions, and assess the efficacy of various temperature and pH response functions. Incorporating the Windermere Humic Aqueous Model (WHAM) describes the observed pH evolution. Fe reduction can increase pH toward neutral pH to facilitate methanogenesis.
Xiaofeng Xu, Fengming Yuan, Paul J. Hanson, Stan D. Wullschleger, Peter E. Thornton, William J. Riley, Xia Song, David E. Graham, Changchun Song, and Hanqin Tian
Biogeosciences, 13, 3735–3755, https://doi.org/10.5194/bg-13-3735-2016, https://doi.org/10.5194/bg-13-3735-2016, 2016
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Accurately projecting future climate change requires a good methane modeling. However, how good the current models are and what are the key improvements needed remain unclear. This paper reviews the 40 published methane models to characterize the strengths and weakness of current methane models and further lay out the roadmap for future model improvements.
A. A. Ali, C. Xu, A. Rogers, R. A. Fisher, S. D. Wullschleger, E. C. Massoud, J. A. Vrugt, J. D. Muss, N. G. McDowell, J. B. Fisher, P. B. Reich, and C. J. Wilson
Geosci. Model Dev., 9, 587–606, https://doi.org/10.5194/gmd-9-587-2016, https://doi.org/10.5194/gmd-9-587-2016, 2016
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We have developed a mechanistic model of leaf utilization of nitrogen for assimilation (LUNA V1.0) to predict the photosynthetic capacities at the global scale based on the optimization of key leaf-level metabolic processes. LUNA model predicts that future climatic changes would mostly affect plant photosynthetic capabilities in high-latitude regions and that Earth system models using fixed photosynthetic capabilities are likely to substantially overestimate future global photosynthesis.
Related subject area
Biogeochemistry: Soils
A novel isotope pool dilution approach to quantify gross rates of key abiotic and biological processes in the soil phosphorus cycle
Frequency and intensity of nitrogen addition alter soil inorganic sulfur fractions, but the effects vary with mowing management in a temperate steppe
Global soil–climate–biome diagram: linking surface soil properties to climate and biota
Shifting mineral and redox controls on carbon cycling in seasonally flooded mineral soils
Pedogenic and microbial interrelation in initial soils under semiarid climate on James Ross Island, Antarctic Peninsula region
Global satellite-driven estimates of heterotrophic respiration
Underestimation of denitrification rates from field application of the 15N gas flux method and its correction by gas diffusion modelling
Microbial biobanking – cyanobacteria-rich topsoil facilitates mine rehabilitation
Modeling soil organic carbon dynamics in temperate forests with Yasso07
The importance of mineral determinations to PROFILE base cation weathering release rates: a case study
Iron minerals inhibit the growth of Pseudomonas brassicacearum J12 via a free-radical mechanism: implications for soil carbon storage
Multidecadal persistence of organic matter in soils: multiscale investigations down to the submicron scale
On the role of soil water retention characteristic on aerobic microbial respiration
Fluvial sedimentary deposits as carbon sinks: organic carbon pools and stabilization mechanisms across a Mediterranean catchment
Biological enhancement of mineral weathering by Pinus sylvestris seedlings – effects of plants, ectomycorrhizal fungi, and elevated CO2
Large-scale predictions of salt-marsh carbon stock based on simple observations of plant community and soil type
Soil nitrogen response to shrub encroachment in a degrading semi-arid grassland
Plant functional traits determined the latitudinal variations in soil microbial functions: evidence from a forest transect in China
Alteration of nitrous oxide emissions from floodplain soils by aggregate size, litter accumulation and plant–soil interactions
Organic matter characteristics in yedoma and thermokarst deposits on Baldwin Peninsula, west Alaska
Dynamics of deep soil carbon – insights from 14C time-series across a climatic gradient
Modeling rhizosphere carbon and nitrogen cycling in Eucalyptus plantation soil
Environmental drivers of soil phosphorus composition in natural ecosystems
Patterns of longer-term climate change effects on CO2 efflux from biocrusted soils differ from those observed in the short term
Understory vegetation plays the key role in sustaining soil microbial biomass and extracellular enzyme activities
Fungi regulate the response of the N2O production process to warming and grazing in a Tibetan grassland
Soils rich in biological ice-nucleating particles abound in ice-nucleating macromolecules likely produced by fungi
Field-warmed soil carbon changes imply high 21st-century modeling uncertainty
The influence of soil properties and nutrients on conifer forest growth in Sweden, and the first steps in developing a nutrient availability metric
In situ evidence of mineral physical protection and carbon stabilization revealed by nanoscale 3-D tomography
Spatial variation and linkages of soil and vegetation in the Siberian Arctic tundra – coupling field observations with remote sensing data
A model based on Rock-Eval thermal analysis to quantify the size of the centennially persistent organic carbon pool in temperate soils
Massive carbon addition to an organic-rich Andosol increased the subsoil but not the topsoil carbon stock
Contribution of fine tree roots to the silicon cycle in a temperate forest ecosystem developed on three soil types
Flux balance modeling to predict bacterial survival during pulsed-activity events
Straw incorporation increases crop yield and soil organic carbon sequestration but varies under different natural conditions and farming practices in China: a system analysis
Soil properties determine the elevational patterns of base cations and micronutrients in the plant–soil system up to the upper limits of trees and shrubs
High-resolution digital mapping of soil organic carbon in permafrost terrain using machine learning: a case study in a sub-Arctic peatland environment
Carbon and nitrogen pools in thermokarst-affected permafrost landscapes in Arctic Siberia
Explaining CO2 fluctuations observed in snowpacks
Wet–dry cycles impact DOM retention in subsurface soils
Peat decomposability in managed organic soils in relation to land use, organic matter composition and temperature
The role of soil pH on soil carbonic anhydrase activity
Seasonal and interannual dynamics of soil microbial biomass and available nitrogen in an alpine meadow in the eastern part of Qinghai–Tibet Plateau, China
High organic inputs explain shallow and deep SOC storage in a long-term agroforestry system – combining experimental and modeling approaches
Soil solution phosphorus turnover: derivation, interpretation, and insights from a global compilation of isotope exchange kinetic studies
Organic matter dynamics along a salinity gradient in Siberian steppe soils
The effects of burning and grazing on soil carbon dynamics in managed Peruvian tropical montane grasslands
How big is the influence of biogenic silicon pools on short-term changes in water-soluble silicon in soils? Implications from a study of a 10-year-old soil–plant system
CO2 efflux from soils with seasonal water repellency
Wolfgang Wanek, David Zezula, Daniel Wasner, Maria Mooshammer, and Judith Prommer
Biogeosciences, 16, 3047–3068, https://doi.org/10.5194/bg-16-3047-2019, https://doi.org/10.5194/bg-16-3047-2019, 2019
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Efforts to understand the global phosphorus (P) cycle are limited by the scarcity of global data on rates of soil P processes, as well as on its environmental controls. Here, we present a novel approach using radiophosphorus labeling of soils, which allows for the measurement of fluxes of abiotic and biotic soil P processes. This approach is also suitable for strongly weathered and P-depleted soils. Biotic processes are corrected for abiotic processes by comparing live and sterile soils.
Tianpeng Li, Heyong Liu, Ruzhen Wang, Xiao-Tao Lü, Junjie Yang, Yunhai Zhang, Peng He, Zhirui Wang, Xingguo Han, and Yong Jiang
Biogeosciences, 16, 2891–2904, https://doi.org/10.5194/bg-16-2891-2019, https://doi.org/10.5194/bg-16-2891-2019, 2019
Xia Zhao, Yuanhe Yang, Haihua Shen, Xiaoqing Geng, and Jingyun Fang
Biogeosciences, 16, 2857–2871, https://doi.org/10.5194/bg-16-2857-2019, https://doi.org/10.5194/bg-16-2857-2019, 2019
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Surface soils interact strongly with both climate and biota and provide fundamental ecosystem services. However, the quantitative linkages between soil, climate, and biota remain unclear at a global scale. By compiling a large global soil database, we mapped eight major soil properties based on machine learning algorithms and developed a global soil–climate–biome diagram. Our results suggest shifts in soil properties under global climate and land cover change.
Rachelle E. LaCroix, Malak M. Tfaily, Menli McCreight, Morris E. Jones, Lesley Spokas, and Marco Keiluweit
Biogeosciences, 16, 2573–2589, https://doi.org/10.5194/bg-16-2573-2019, https://doi.org/10.5194/bg-16-2573-2019, 2019
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Organic carbon (C) stocks within seasonal wetlands are vulnerable to increased severity and duration of droughts in response to climate change. Here we examined the mechanistic controls on C cycling in seasonally flooded mineral wetland soils. We found that different mechanisms preserve C in surface layers (oxygen limitations) compared to subsurface layers (mineral protection and lack of root C inputs).
Lars A. Meier, Patryk Krauze, Isabel Prater, Fabian Horn, Carlos E. G. R. Schaefer, Thomas Scholten, Dirk Wagner, Carsten W. Mueller, and Peter Kühn
Biogeosciences, 16, 2481–2499, https://doi.org/10.5194/bg-16-2481-2019, https://doi.org/10.5194/bg-16-2481-2019, 2019
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James Ross Island offers the opportunity to study the undisturbed interplay of microbial activity and pedogenesis. Soils from two sites representing coastal and inland conditions were chosen and analyzed with a wide range of techniques to describe soil properties. We are able to show that coastal conditions go along with more intense weathering and therefore favor soil formation and that microbial communities are initially more affected by weathering and structure than by chemical parameters.
Alexandra G. Konings, A. Anthony Bloom, Junjie Liu, Nicholas C. Parazoo, David S. Schimel, and Kevin W. Bowman
Biogeosciences, 16, 2269–2284, https://doi.org/10.5194/bg-16-2269-2019, https://doi.org/10.5194/bg-16-2269-2019, 2019
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We estimate heterotrophic respiration (Rh) – the respiration from microbes in the soil – using satellite estimates of the net carbon flux and other quantities. Rh is an important carbon flux but is rarely studied by itself. Our method is the first to estimate how Rh varies in both space and time. The resulting new estimate of Rh is compared to the best currently available alternative, which is based on interpolating field measurements globally. The two estimates disagree and are both uncertain.
Reinhard Well, Martin Maier, Dominika Lewicka-Szczebak, Jan-Reent Köster, and Nicolas Ruoss
Biogeosciences, 16, 2233–2246, https://doi.org/10.5194/bg-16-2233-2019, https://doi.org/10.5194/bg-16-2233-2019, 2019
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Denitrification is a key process in the soil nitrogen cycle but poorly investigated due to methodical limitations. The 15N gas flux method is currently the only approach allowing field measurement of denitrification but was subject to bias due to unaccounted fluxes of 15N-labelled gaseous denitrification products to the subsoil. We used field flux experiments and diffusion–reaction modelling to estimate this source of error and developed an approach to correct denitrification rates.
Wendy Williams, Angela Chilton, Mel Schneemilch, Stephen Williams, Brett Neilan, and Colin Driscoll
Biogeosciences, 16, 2189–2204, https://doi.org/10.5194/bg-16-2189-2019, https://doi.org/10.5194/bg-16-2189-2019, 2019
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Rare earth mining processes require the removal of topsoil that is mechanically scraped off and relocated to topsoil stockpiles, which proved beneficial for microbial biobanking. But there appears to be a critical time frame for holding topsoil, and rainfall penetration into the stockpile may result in the demise of cyanobacteria. In the longer term, provided conditions are favourable, there may be adequate cyanobacterial survival, at least down to 50 cm, to recolonise the soil surfaces.
Zhun Mao, Delphine Derrien, Markus Didion, Jari Liski, Thomas Eglin, Manuel Nicolas, Mathieu Jonard, and Laurent Saint-André
Biogeosciences, 16, 1955–1973, https://doi.org/10.5194/bg-16-1955-2019, https://doi.org/10.5194/bg-16-1955-2019, 2019
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In a context of global changes, modeling and predicting the dynamics of soil carbon stocks in forest ecosystems are vital but challenging. Yasso07 is considered to be one of the most promising models for such a purpose. We examine the accuracy of its prediction of soil carbon dynamics over the whole French metropolitan territory at a decennial timescale. We revealed how the bottleneck in soil carbon modeling is linked with the lack of knowledge on soil carbon quality and fine-root litter.
Sophie Casetou-Gustafson, Cecilia Akselsson, Stephen Hillier, and Bengt A. Olsson
Biogeosciences, 16, 1903–1920, https://doi.org/10.5194/bg-16-1903-2019, https://doi.org/10.5194/bg-16-1903-2019, 2019
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PROFILE base cation weathering estimates using the directly measured XRPD mineralogy compared to different indirectly determined A2M mineralogies (regional versus site-specific) were overall similar. However, the underlying contribution from different minerals to the overall rates differed. Descriptions of the dissolution rate kinetics of the plagioclase mineral group as well as major K-bearing minerals (K feldspars and micas) should be improved for future soil and forest management studies.
Hai-Yan Du, Guang-Hui Yu, Fu-Sheng Sun, Muhammad Usman, Bernard A. Goodman, Wei Ran, and Qi-Rong Shen
Biogeosciences, 16, 1433–1445, https://doi.org/10.5194/bg-16-1433-2019, https://doi.org/10.5194/bg-16-1433-2019, 2019
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Mineral binding is a major mechanism for soil carbon (C) stabilization. However, soil minerals can also inhibit the growth of bacteria that protect organic C from decay. Here the findings indicate that reduced surface Fe(II) derived from Fe(III)-containing minerals inhibits the growth of bacteria via a free-radical mechanism, which may serve as an ubiquitous mechanism between iron minerals and all of the heterotrophic bacteria in view of bacteria as a vast source of superoxide.
Suzanne Lutfalla, Pierre Barré, Sylvain Bernard, Corentin Le Guillou, Julien Alléon, and Claire Chenu
Biogeosciences, 16, 1401–1410, https://doi.org/10.5194/bg-16-1401-2019, https://doi.org/10.5194/bg-16-1401-2019, 2019
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Soils store large amounts of carbon in soil organic matter, which comes from plant debris and roots. The mechanisms protecting it from biodegradation are not fully understood. Here, we carry out a size-fractionation of soil sampled on different dates in a field experiment. Using carbon and nitrogen content and spectroscopy and microscopy we conclude that organic matter enriched in nitrogen is preferentially protected from biodegradation and that clay minerals have differing protective abilities.
Teamrat A. Ghezzehei, Benjamin Sulman, Chelsea L. Arnold, Nathaniel A. Bogie, and Asmeret Asefaw Berhe
Biogeosciences, 16, 1187–1209, https://doi.org/10.5194/bg-16-1187-2019, https://doi.org/10.5194/bg-16-1187-2019, 2019
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Soil water is a medium from which microbes acquire resources and within which they are able to move. Occupancy and availability of water and oxygen gas in soils are mutually exclusive. In addition, as soil dries the remaining water is held with an increasing degree of adhesive energy, which restricts microbes' ability to extract resources from water. We introduce a mathematical model that describes these interacting effects and organic matter decomposition.
María Martínez-Mena, María Almagro, Noelia García-Franco, Joris de Vente, Eloisa García, and Carolina Boix-Fayos
Biogeosciences, 16, 1035–1051, https://doi.org/10.5194/bg-16-1035-2019, https://doi.org/10.5194/bg-16-1035-2019, 2019
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Understanding the mechanisms of OC stabilization within Mediterranean river systems could have important implications for the stability of soil carbon stocks affected by erosion. These results underline the importance of studying soil erosion, soil formation, and geomorphological processes together in semiarid and subhumid catchments, where intermittent fluvial courses are predominant. Good management of these environments will be a powerful tool for climate change mitigation.
Nicholas P. Rosenstock, Patrick A. W. van Hees, Petra M. A. Fransson, Roger D. Finlay, and Anna Rosling
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-46, https://doi.org/10.5194/bg-2019-46, 2019
Revised manuscript accepted for BG
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We examined the effects of elevated CO2, pine seedlings, and ectomycorrhizal fungi on mineral weathering. Seedlings significantly increased mineral weathering, while elevated CO2 increased plant growth and organic acid concentrations, but had no effect on weathering. Ectomycorrhial fungi showed some tendency to increase weathering. We conclude that nutrient uptake, which reduces transport limitation to weathering, is the primary mechanism by which plants enhanced weathering in this system.
Hilary Ford, Angus Garbutt, Mollie Duggan-Edwards, Jordi F. Pagès, Rachel Harvey, Cai Ladd, and Martin W. Skov
Biogeosciences, 16, 425–436, https://doi.org/10.5194/bg-16-425-2019, https://doi.org/10.5194/bg-16-425-2019, 2019
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Carbon stored in coastal wetlands is of global relevance to climate regulation, but broadscale inventories of this "blue carbon" are lacking. Sampling salt marshes in the UK, we developed a predictive tool with the capacity to predict up to 44 % of spatial variation in soil carbon from simple observations of plant community and soil type. Marsh-specific maps of soil carbon were also produced, demonstrating the application of this easy-to-use tool for landscape-scale predictions of blue carbon.
Thomas Turpin-Jelfs, Katerina Michaelides, Joel A. Biederman, and Alexandre M. Anesio
Biogeosciences, 16, 369–381, https://doi.org/10.5194/bg-16-369-2019, https://doi.org/10.5194/bg-16-369-2019, 2019
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Increasing shrub cover promotes land degradation in semi-arid grasslands and has the potential to impact the soil nitrogen pool, which is essential to primary production. Our study showed that increasing shrub cover concentrates soil nitrogen into localised patches beneath shrub canopies. Further, we determined that increasing shrub cover inhibits inputs of nitrogen by the soil microbial community. Thus, we conclude this phenomenon can perturb nitrogen cycling in these ecosystems.
Zhiwei Xu, Guirui Yu, Xinyu Zhang, Ruili Wang, Ning Zhao, Nianpeng He, and Qiufeng Wang
Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-499, https://doi.org/10.5194/bg-2018-499, 2019
Revised manuscript accepted for BG
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Plant functional traits have increasingly been studied as determinants of ecosystem propertie. While the relationships between biological community structures and ecological functions remain poorly understood at the large scale. We found that there was considerable variation in the profiles of different substrate use along the NSTEC. The soil silt content and plant functional traits together shaped the biogeographical pattern of the soil microbial substrate use.
Martin Ley, Moritz F. Lehmann, Pascal A. Niklaus, and Jörg Luster
Biogeosciences, 15, 7043–7057, https://doi.org/10.5194/bg-15-7043-2018, https://doi.org/10.5194/bg-15-7043-2018, 2018
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Our laboratory study shows how microhabitat formation linked to soil aggregates, litter accumulation and plant soil interactions affects conditions under which
hot momentsof enhanced N2O emissions from floodplain soils during the drying phase after saturation occur. Larger aggregate size led to higher integrated flux rates when soil was unamended or mixed with leaf litter, whereas planting with willow significantly reduced emissions. Also, emission time patterns differed among the treatments.
Loeka L. Jongejans, Jens Strauss, Josefine Lenz, Francien Peterse, Kai Mangelsdorf, Matthias Fuchs, and Guido Grosse
Biogeosciences, 15, 6033–6048, https://doi.org/10.5194/bg-15-6033-2018, https://doi.org/10.5194/bg-15-6033-2018, 2018
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Arctic warming mobilizes belowground organic matter in northern high latitudes. This study focused on the size of organic carbon pools and organic matter quality in ice-rich permafrost on the Baldwin Peninsula, West Alaska. We analyzed biogeochemistry and found that three-quarters of the carbon is stored in degraded permafrost deposits. Nonetheless, using biomarker analyses, we showed that the organic matter in undisturbed yedoma permafrost has a higher potential for decomposition.
Tessa Sophia van der Voort, Utsav Mannu, Frank Hagedorn, Cameron McIntyre, Lorenz Walthert, Patrick Schleppi, Negar Haghipour, and Timothy Ian Eglinton
Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-361, https://doi.org/10.5194/bg-2018-361, 2018
Revised manuscript accepted for BG
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The carbon stored in soils is the largest reservoir of organic carbon on land. In the context of greenhouse gas emissions and a changing climate, it is very important to understand how stable the carbon in the soil is and why. The deeper parts of the soil have often been overlooked even though they store a lot of carbon. In this paper, we discovered that although deep soil carbon is expected to be old in stable, there can be a significant young component that cycles much faster.
Rafael Vasconcelos Valadares, Júlio César Lima Neves, Maurício Dutra Costa, Philip James Smethurst, Luiz Alexandre Peternelli, Guilherme Luiz Jesus, Reinaldo Bertola Cantarutti, and Ivo Ribeiro Silva
Biogeosciences, 15, 4943–4954, https://doi.org/10.5194/bg-15-4943-2018, https://doi.org/10.5194/bg-15-4943-2018, 2018
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Eucalyptus plantations produce large extensions of fine roots that release energy-rich organic compounds into the soil, causing an increase in the number of microorganisms that degrade soil organic matter and release N to the trees, in the so-called rhizosphere priming effect. In order to estimate the quantitative importance of this phenomena, a mechanistic model was elaborated – the ForPRAN. It has been estimated that rhizosphere cycling can supply about 24.6 % of N accumulated in Eucalyptus.
Leonardo Deiss, Anibal de Moraes, and Vincent Maire
Biogeosciences, 15, 4575–4592, https://doi.org/10.5194/bg-15-4575-2018, https://doi.org/10.5194/bg-15-4575-2018, 2018
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Our results unraveled how soil inorganic and organic phosphorus compounds respond to edaphic variables, climatic variables, and soil weathering stages as a proxy for pedogenesis at an unprecedented geographical scale. Soil P composition is determined by distinctive drivers that regulate key ecological processes governing their presence, transformation, and persistence on terrestrial natural ecosystems.
Anthony Darrouzet-Nardi, Sasha C. Reed, Edmund E. Grote, and Jayne Belnap
Biogeosciences, 15, 4561–4573, https://doi.org/10.5194/bg-15-4561-2018, https://doi.org/10.5194/bg-15-4561-2018, 2018
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Biocrusts are photosynthetic communities on the surface of many desert soils. We investigated the response of biocrusts and the soil beneath them (including plant roots) to 9 years of simulated warming and changing precipitation patterns. We monitored the exchange of carbon between soil and atmosphere using automated chambers. As plants and biocrusts responded negatively to the treatments, we saw reduced photosynthesis in biocrusts but variable overall carbon exchange over 9 years.
Yang Yang, Xinyu Zhang, Chuang Zhang, Huimin Wang, Xiaoli Fu, Fusheng Chen, Songze Wan, Xiaomin Sun, Xuefa Wen, and Jifu Wang
Biogeosciences, 15, 4481–4494, https://doi.org/10.5194/bg-15-4481-2018, https://doi.org/10.5194/bg-15-4481-2018, 2018
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In this study, we established a long-term field experiment to assess how the soil abiotic properties, PLFAs, and enzyme activities in a Chinese fir plantation changed when the understory vegetation was removed. We found that understory vegetation plays a key role in sustaining soil carbon content, microbial biomass, and extracellular enzyme activities. We therefore proposed that, to sustain soil quality in subtropical Chinese fir plantations, understory vegetation should be maintained.
Lei Zhong, Shiping Wang, Xingliang Xu, Yanfen Wang, Yichao Rui, Xiaoqi Zhou, Qinhua Shen, Jinzhi Wang, Lili Jiang, Caiyun Luo, Tianbao Gu, Wenchao Ma, and Guanyi Chen
Biogeosciences, 15, 4447–4457, https://doi.org/10.5194/bg-15-4447-2018, https://doi.org/10.5194/bg-15-4447-2018, 2018
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Soil fungi could be the main source of N2O production potential in the Tibetan alpine grasslands. Warming and winter grazing may not affect the potential for soil N2O production potential, but climate warming can alter biotic pathways responsible for N2O production. These findings indicate that characterizing how fungal nitrification–denitrification contributes to N2O production, as well as how it responds to environmental and land use changes, can advance our understanding of N cycling.
Franz Conen and Mikhail V. Yakutin
Biogeosciences, 15, 4381–4385, https://doi.org/10.5194/bg-15-4381-2018, https://doi.org/10.5194/bg-15-4381-2018, 2018
Katherine Todd-Brown, Bin Zheng, and Thomas W. Crowther
Biogeosciences, 15, 3659–3671, https://doi.org/10.5194/bg-15-3659-2018, https://doi.org/10.5194/bg-15-3659-2018, 2018
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The temperature sensitivity of soil carbon loss is a critical parameter for projecting future CO2. Isolating soil temperature response in the field is challenging due to difficulties isolating root and microbial respiration. We use a database of direct-warming soil carbon changes to generate a new global temperature sensitivity. Incorporating this into Earth system models reduces projected soil carbon. But it also shows that variation due to this parameter is as high as all other causes.
Kevin Van Sundert, Joanna A. Horemans, Johan Stendahl, and Sara Vicca
Biogeosciences, 15, 3475–3496, https://doi.org/10.5194/bg-15-3475-2018, https://doi.org/10.5194/bg-15-3475-2018, 2018
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Nutrient availability regulates terrestrial ecosystem function and global change responses, and thus the capacity to buffer climate change by CO2 uptake. Large-scale studies allow generalizing on the role of nutrients, but comparing the nutrient status among sites poses a bottleneck. In this study, we adjust a nutrient availability metric for seminatural systems, using Swedish forest data. Future studies should evaluate metric performance outside boreal forests and provide further adjustments.
Yi-Tse Weng, Chun-Chieh Wang, Cheng-Cheng Chiang, Heng Tsai, Yen-Fang Song, Shiuh-Tsuen Huang, and Biqing Liang
Biogeosciences, 15, 3133–3142, https://doi.org/10.5194/bg-15-3133-2018, https://doi.org/10.5194/bg-15-3133-2018, 2018
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We have developed a high-resolution 3-D tomography approach and successfully applied it. We provided in situ evidence and reveal an abundance of mineral nanoparticles, in dense thin layers or nano-aggregates/clusters, instead of crystalline clay-sized minerals on or near OC surfaces. The key working minerals for C stabilization were reactive short-range-order (SRO) mineral nanoparticles and poorly crystalline submicron-sized clay minerals in a Fe oxyhydroxide-poor environment.
Juha Mikola, Tarmo Virtanen, Maiju Linkosalmi, Emmi Vähä, Johanna Nyman, Olga Postanogova, Aleksi Räsänen, D. Johan Kotze, Tuomas Laurila, Sari Juutinen, Vladimir Kondratyev, and Mika Aurela
Biogeosciences, 15, 2781–2801, https://doi.org/10.5194/bg-15-2781-2018, https://doi.org/10.5194/bg-15-2781-2018, 2018
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To support C exchange measurements, we examined plant and soil attributes in Siberian Arctic tundra. Our results illustrate a typical tundra ecosystem with great spatial variation. Mosses dominate plant biomass and control many soil attributes such as temperature, but variation in moss biomass is difficult to capture by remote sensing. This indicates challenges in spatial extrapolation of some of those plant and soil attributes that are relevant for regional ecosystem and global climate models.
Lauric Cécillon, François Baudin, Claire Chenu, Sabine Houot, Romain Jolivet, Thomas Kätterer, Suzanne Lutfalla, Andy Macdonald, Folkert van Oort, Alain F. Plante, Florence Savignac, Laure N. Soucémarianadin, and Pierre Barré
Biogeosciences, 15, 2835–2849, https://doi.org/10.5194/bg-15-2835-2018, https://doi.org/10.5194/bg-15-2835-2018, 2018
Antonia Zieger, Klaus Kaiser, Pedro Ríos Guayasamín, and Martin Kaupenjohann
Biogeosciences, 15, 2743–2760, https://doi.org/10.5194/bg-15-2743-2018, https://doi.org/10.5194/bg-15-2743-2018, 2018
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We tested a current theory, which proposes an upper limit for organic carbon (OC) stocks independent of increasing carbon input for a soil with already large OC stocks. The soil received a large additional carbon input as sawdust. In response, only the OC stock in 25–50 cm depth increased significantly. We assume, that due to saturation in 0–25 cm, added OC migrates downwards and becomes retained in 25–50 cm. This indicates the possibility to sustainably increase already large OC stocks further.
Marie-Pierre Turpault, Christophe Calvaruso, Gil Kirchen, Paul-Olivier Redon, and Carine Cochet
Biogeosciences, 15, 2231–2249, https://doi.org/10.5194/bg-15-2231-2018, https://doi.org/10.5194/bg-15-2231-2018, 2018
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Silicon (Si) plays an important role in soil processes. If the influence of forest vegetation in the Si cycle has been widely examined, no study has investigated the specific role of fine tree roots. This study reveals that biological processes play a predominant role in the Si cycle in temperate forest ecosystems, while the geochemical processes seems to be limited. About 99 % of the Si taken up by trees each year returns to the soil via the degradation of litterfall and fine dead roots.
Nicholas A. Jose, Rebecca Lau, Tami L. Swenson, Niels Klitgord, Ferran Garcia-Pichel, Benjamin P. Bowen, Richard Baran, and Trent R. Northen
Biogeosciences, 15, 2219–2229, https://doi.org/10.5194/bg-15-2219-2018, https://doi.org/10.5194/bg-15-2219-2018, 2018
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Microcoleus vaginatus, a filamentous cyanobacteria, is a primary producer and pioneer in desert biological soil crusts (BSCs). Previous studies have suggested that biopolymers play a central role in M. vaginatus' ability to survive in arid conditions. We have developed a genome-scale metabolic model with experimental validation to elucidate the mechanism of this phenomenon and predict survival during pulsed-activity events, providing a basis for future modeling of BSCs.
Xiao Han, Cong Xu, Jennifer A. J. Dungait, Roland Bol, Xiaojie Wang, Wenliang Wu, and Fanqiao Meng
Biogeosciences, 15, 1933–1946, https://doi.org/10.5194/bg-15-1933-2018, https://doi.org/10.5194/bg-15-1933-2018, 2018
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Straw incorporation increases soil organic carbon (SOC) stocks and crop yields in experimental trials across China, regardless of the climate or land use. This conclusion is based on a wide range of soils and climate conditions and suggests that farmers across the world may use this simple management tool to increase their outputs by improving the quality of their outputs by improving the quality of their soil, while mitigating climate change.
Ruzhen Wang, Xue Wang, Yong Jiang, Artemi Cerdà, Jinfei Yin, Heyong Liu, Xue Feng, Zhan Shi, Feike A. Dijkstra, and Mai-He Li
Biogeosciences, 15, 1763–1774, https://doi.org/10.5194/bg-15-1763-2018, https://doi.org/10.5194/bg-15-1763-2018, 2018
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Our results highlight the importance of soil physicochemical properties (mainly SOC, C : N, and pH) rather than elevation (i.e., canopy cover and environmental factors, especially temperature) in determining base cation and micronutrient availabilities in soils and subsequently their concentrations in plant tissues.
Matthias B. Siewert
Biogeosciences, 15, 1663–1682, https://doi.org/10.5194/bg-15-1663-2018, https://doi.org/10.5194/bg-15-1663-2018, 2018
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Large amounts of soil organic carbon are stored in the circumpolar permafrost region. This article aims to improve how we map this carbon. Typically the amount of soil organic carbon is estimated using soil or land cover maps. Here the amount of carbon is modeled using machine learning. This is done at a very fine spatial resolution of 1 × 1 m. This reveals a lot of small-scale landscape variability and underlines the importance of permafrost-related landforms vulnerable to a warming climate.
Matthias Fuchs, Guido Grosse, Jens Strauss, Frank Günther, Mikhail Grigoriev, Georgy M. Maximov, and Gustaf Hugelius
Biogeosciences, 15, 953–971, https://doi.org/10.5194/bg-15-953-2018, https://doi.org/10.5194/bg-15-953-2018, 2018
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Our paper investigates soil organic carbon and nitrogen in permafrost soils on Sobo-Sise Island and Bykovsky Peninsula in the north of eastern Siberia. We collected and analysed permafrost soil cores and upscaled carbon and nitrogen stocks to landscape level. We found large amounts of carbon and nitrogen stored in these frozen soils, reconstructed sedimentation rates and estimated the potential increase in organic carbon availability if permafrost continues to thaw and active layer deepens.
Laura Graham and David Risk
Biogeosciences, 15, 847–859, https://doi.org/10.5194/bg-15-847-2018, https://doi.org/10.5194/bg-15-847-2018, 2018
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Winter carbon dioxide (CO2) respiration from soils is a significant and understudied component of the global carbon (C) cycle. In this study, we were able to show with a field campaign and a model how windy (advective) conditions can affect the usually slow (diffusive) transport of CO2 from soils and out of snowpacks. This research is important to help with understanding winter CO2 dynamics, especially for continued accurate accounting of the annual global C cycle.
Yaniv Olshansky, Robert A. Root, and Jon Chorover
Biogeosciences, 15, 821–832, https://doi.org/10.5194/bg-15-821-2018, https://doi.org/10.5194/bg-15-821-2018, 2018
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Dissolved organic matter (DOM) fate in soils can be impacted by frequent wet–dry cycles that occur in the subsoil environment. This study provides direct evidence that wet–dry cycles altered both composition and spatial distribution of organic carbon on a complex soil matrix. Therefore transformation of soils with a wet environment to higher fluctuation in soil moisture, as predicted by climate models, may alter the interactions between DOM and soil surfaces.
Cédric Bader, Moritz Müller, Rainer Schulin, and Jens Leifeld
Biogeosciences, 15, 703–719, https://doi.org/10.5194/bg-15-703-2018, https://doi.org/10.5194/bg-15-703-2018, 2018
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When drained, peatlands degrade and release large quantities of CO2, thereby contributing to global warming. Do land use or the chemical composition of peat control the rate of that release? We studied 21 sites from the temperate climate zone managed as croplands, grasslands, or forests and found that the CO2 release was high, but only slightly influenced by land use or peat composition. Hence, only keeping peatlands in their natural state prevents them from becoming strong CO2 sources.
Joana Sauze, Sam P. Jones, Lisa Wingate, Steven Wohl, and Jérôme Ogée
Biogeosciences, 15, 597–612, https://doi.org/10.5194/bg-15-597-2018, https://doi.org/10.5194/bg-15-597-2018, 2018
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Previous studies have shown that differences in soil carbonic anhydrase (CA) activity are found in different biomes and seasons, but our understanding of the drivers responsible for those patterns is still limited. We artificially increased the soil CA concentration to test how soil pH affected the relationship between soil CA activity and concentration. We found that soil pH was the primary driver of soil CA activity.
Bo Xu, Jinniu Wang, Ning Wu, Yan Wu, and Fusun Shi
Biogeosciences, 15, 567–579, https://doi.org/10.5194/bg-15-567-2018, https://doi.org/10.5194/bg-15-567-2018, 2018
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The Qinghai–Tibet Plateau is sensitive to climate change. We documented seasonal and interannual dynamics of soil microbial and available N in an alpine meadow in this region. Consistently increasing trends of microbial biomass and available N pools were observed during the nongrowing season. Significant shifts in microbial communities largely contributed to microbial reduction during soil thaw. Divergent seasonal dynamics of different N forms showed a complementary nutrient supply pattern.
Rémi Cardinael, Bertrand Guenet, Tiphaine Chevallier, Christian Dupraz, Thomas Cozzi, and Claire Chenu
Biogeosciences, 15, 297–317, https://doi.org/10.5194/bg-15-297-2018, https://doi.org/10.5194/bg-15-297-2018, 2018
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The introduction of trees in an agricultural field modifies organic matter (OM) inputs to the soil (litterfall, root litter), the microclimate, and the stabilization and decomposition processes of OM. These changes could affect soil organic carbon (SOC) storage, but the importance of each process is not well known. In a long-term agroforestry trial, we showed that SOC storage could be explained by high OM inputs to the soil but that enhanced decomposition could also have reduced this potential.
Julian Helfenstein, Jannes Jegminat, Timothy I. McLaren, and Emmanuel Frossard
Biogeosciences, 15, 105–114, https://doi.org/10.5194/bg-15-105-2018, https://doi.org/10.5194/bg-15-105-2018, 2018
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Soil solution phosphorus (P) turnover is essential for describing the bioavailability of this important nutrient. Here, we provide a derivation of calculating soil solution P turnover using parameters obtained from isotope exchange kinetic experiments. We then calculated and analyzed soil solution P turnover for 217 soils and for 18 long-term P fertilizer field experiments worldwide. Our study thus provides important insights on P dynamics in soils.
Norbert Bischoff, Robert Mikutta, Olga Shibistova, Reiner Dohrmann, Daniel Herdtle, Lukas Gerhard, Franziska Fritzsche, Alexander Puzanov, Marina Silanteva, Anna Grebennikova, and Georg Guggenberger
Biogeosciences, 15, 13–29, https://doi.org/10.5194/bg-15-13-2018, https://doi.org/10.5194/bg-15-13-2018, 2018
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This study suggests that soil moisture significantly affects soil organic matter dynamics along a salinity gradient in semiarid steppe soils. The covarying moisture gradient along the salinity gradient serves as an explanatory factor for (i) the increasing soil organic carbon (OC) stocks with increasing salinity, (ii) the constant proportion and stability of particulate OC along the transect, and (iii) a similar fungi : bacteria ratio in the topsoils along the studied gradient.
Viktoria Oliver, Imma Oliveras, Jose Kala, Rebecca Lever, and Yit Arn Teh
Biogeosciences, 14, 5633–5646, https://doi.org/10.5194/bg-14-5633-2017, https://doi.org/10.5194/bg-14-5633-2017, 2017
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Fire occurrence in the Peruvian montane grasslands has increased due to climate change and agricultural expansion. This study aimed to investigate how anthropogenic activities affect soil carbon stocks in this ecosystem. Burn history (burnt 10 years ago) and grazing appeared to cause no significant change in total soil carbon, but there were significant losses to the labile carbon, suggesting a change in the soil carbon dynamics – findings that are relevant for future environmental policymakers.
Daniel Puppe, Axel Höhn, Danuta Kaczorek, Manfred Wanner, Marc Wehrhan, and Michael Sommer
Biogeosciences, 14, 5239–5252, https://doi.org/10.5194/bg-14-5239-2017, https://doi.org/10.5194/bg-14-5239-2017, 2017
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We quantified different biogenic Si pools in soils of a developing ecosystem and analyzed their influence on short-term changes of the water soluble Si fraction. From our results we concluded small (< 5 µm) and/or fragile phytogenic Si structures to have the biggest impact on short-term changes of water soluble Si. Analyses of these phytogenic Si structures are urgently needed in future as they seem to represent the most important driver of Si cycling in terrestrial biogeosystems in general.
Emilia Urbanek and Stefan H. Doerr
Biogeosciences, 14, 4781–4794, https://doi.org/10.5194/bg-14-4781-2017, https://doi.org/10.5194/bg-14-4781-2017, 2017
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We studied CO2 emissions from soils that are seasonally water-epellent, and the wetting and water movement is restricted. When CO2 emissions are low soil is consistently water-repellent after a long dry spells, but when water repellency and thus soil moisture are patchy CO2 emission rates are high. The presence of water repellency may therefore increase rather than reduce soil CO2 emissions, which may result in higher soil carbon losses than it was previously anticipated.
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Short summary
Arctic soils store vast amounts of frozen carbon that will thaw, fueling microbes that produce carbon dioxide and methane greenhouse gases. We compared methane producing and oxidizing activities in incubated soils and permafrost of Arctic tundra to improve estimates of net emissions. The methane oxidation profile in these soils differs from temperate ecosystems: maximum methane oxidation potential occurs in suboxic soils and permafrost layers, close to the methanogens that produce methane.
Arctic soils store vast amounts of frozen carbon that will thaw, fueling microbes that produce...
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