Articles | Volume 12, issue 1
https://doi.org/10.5194/bg-12-49-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/bg-12-49-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article
| 
06 Jan 2015
Research article |
| 06 Jan 2015
A novel reflectance-based model for evaluating chlorophyll concentrations of fresh and water-stressed leaves
Department of Forestry and Natural Resources, National Chiayi University, Chiayi, Taiwan
S. C. Popescu
Department of Ecosystem Science and Management, Texas A&M University, College Station, Texas, USA
S. C. Huang
Department of Forestry and Natural Resources, National Chiayi University, Chiayi, Taiwan
P. T. Chang
Department of Horticultural Science, National Chiayi University, Chiayi, Taiwan
H. L. Wen
Department of Forestry and Natural Resources, National Chiayi University, Chiayi, Taiwan
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Spring blooms in the Baltic Sea have weakened but lengthened from 2000 to 2014
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Biogeosciences, 18, 6077–6091, https://doi.org/10.5194/bg-18-6077-2021, https://doi.org/10.5194/bg-18-6077-2021, 2021
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Remote sensing measurements of forest structure promise to improve monitoring of tropical forest health. We investigated drone-based vegetation measurements' abilities to capture different structural and functional elements of a tropical forest. We found that emerging vegetation indices captured greater variability than traditional indices and one new index trends with daily change in carbon flux. These new tools can help improve understanding of tropical forest structure and function.
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Biogeosciences, 16, 2937–2947, https://doi.org/10.5194/bg-16-2937-2019, https://doi.org/10.5194/bg-16-2937-2019, 2019
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Sofia Cerasoli, Manuel Campagnolo, Joana Faria, Carla Nogueira, and Maria da Conceição Caldeira
Biogeosciences, 15, 5455–5471, https://doi.org/10.5194/bg-15-5455-2018, https://doi.org/10.5194/bg-15-5455-2018, 2018
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We compared the ability of in situ spectral and satellite sensors to estimate the productivity of Mediterranean grasslands undergoing different fertilization treatments. The objective of the study was to identify the best set of spectral predictors. In situ CO gas exchange and vegetation reflectance measurements were used for this purpose. Our results show the potential of Sentinel 2 and Landsat 8 satellites to monitor grasslands in support of a sustainable agriculture management.
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Biogeosciences, 13, 4959–4973, https://doi.org/10.5194/bg-13-4959-2016, https://doi.org/10.5194/bg-13-4959-2016, 2016
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Phytoplankton spring bloom phenology was derived from a 15-year time series (2000–2014) of ship-of-opportunity chlorophyll a fluorescence observations in the Baltic Sea. Bloom peak concentrations have declined over the study period, while bloom duration has increased. It is concluded that nutrient reduction efforts led to decreasing bloom intensity, while changes in Baltic Sea environmental conditions associated with global change corresponded to a lengthening spring bloom period.
Rebecca N. Handcock, D. L. Gobbett, Luciano A. González, Greg J. Bishop-Hurley, and Sharon L. McGavin
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Proximal sensors can assist in managing feed in livestock production systems but raw data needs calibration to biophysical values such as biomass and ground cover. Our pilot project monitored tropical pastures for 18 months using digital cameras, multispectral sensors, soil moisture sensors, and field observations. We developed stringent data cleaning rules that are applicable to other sensor projects. Proximal sensors were found to deliver continual and timely pasture data.
T. Tagesson, R. Fensholt, S. Huber, S. Horion, I. Guiro, A. Ehammer, and J. Ardö
Biogeosciences, 12, 4621–4635, https://doi.org/10.5194/bg-12-4621-2015, https://doi.org/10.5194/bg-12-4621-2015, 2015
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Relationships between ecosystem properties of semi-arid savanna and reflected solar radiance between 35 and 1800nm were investigated. Normalised combinations of reflectance for the near infrared, shortwave infrared, and 600 to 700nm were strongly affected by solar and viewing angle effects. Ecosystem properties of savannas were strongly correlated with reflectance at 350-1800nm, and normalised combinations of reflectance were strong predictors of the savanna ecosystem properties.
M. Thyssen, S. Alvain, A. Lefèbvre, D. Dessailly, M. Rijkeboer, N. Guiselin, V. Creach, and L.-F. Artigas
Biogeosciences, 12, 4051–4066, https://doi.org/10.5194/bg-12-4051-2015, https://doi.org/10.5194/bg-12-4051-2015, 2015
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Phytoplankton community structure at a high spatial resolution (<3km) was studied in the North Sea during a cruise in May 2011. A first comparison with PHYSAT reflectance anomalies enables the extrapolation of the community structure rather than a dominant type at the North Sea scale and was interpreted with its hydrological characteristics. This will seriously improve our understanding of the influence of community structure on biogeochemical processes at the daily and basin scales.
L. Peperzak, H. J. van der Woerd, and K. R. Timmermans
Biogeosciences, 12, 1659–1670, https://doi.org/10.5194/bg-12-1659-2015, https://doi.org/10.5194/bg-12-1659-2015, 2015
T. Hakala, O. Nevalainen, S. Kaasalainen, and R. Mäkipää
Biogeosciences, 12, 1629–1634, https://doi.org/10.5194/bg-12-1629-2015, https://doi.org/10.5194/bg-12-1629-2015, 2015
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A hyperspectral lidar produces point clouds with multiple spectral channels (colours) for each point. We measured a pine and used the spectral content to estimate chlorophyll content. We validated these results using chemical laboratory analysis of needles taken from the pine. Our prototype has limitations, but still shows the great potential of coloured point clouds. Potential applications include forestry, security, archaeology and city modelling.
N. K. Ganju, J. L. Miselis, and A. L. Aretxabaleta
Biogeosciences, 11, 7193–7205, https://doi.org/10.5194/bg-11-7193-2014, https://doi.org/10.5194/bg-11-7193-2014, 2014
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Light availability to seagrass is an important factor in their success. We deployed instrumentation to measure light in Barnegat Bay, New Jersey, and found lower availability in the southern bay due to high turbidity (suspended sediment), while the northern bay has higher availability. In the northern bay, dissolved organic material and chlorophyll are most responsible for blocking light to the seagrass canopy. We also found that boat wakes do not have a large effect on sediment resuspension.
M. W. Matthews and S. Bernard
Biogeosciences, 10, 8139–8157, https://doi.org/10.5194/bg-10-8139-2013, https://doi.org/10.5194/bg-10-8139-2013, 2013
P. Chatzimpiros and S. Barles
Biogeosciences, 10, 471–481, https://doi.org/10.5194/bg-10-471-2013, https://doi.org/10.5194/bg-10-471-2013, 2013
M. Rossini, S. Cogliati, M. Meroni, M. Migliavacca, M. Galvagno, L. Busetto, E. Cremonese, T. Julitta, C. Siniscalco, U. Morra di Cella, and R. Colombo
Biogeosciences, 9, 2565–2584, https://doi.org/10.5194/bg-9-2565-2012, https://doi.org/10.5194/bg-9-2565-2012, 2012
A. Fujiwara, T. Hirawake, K. Suzuki, and S.-I. Saitoh
Biogeosciences, 8, 3567–3580, https://doi.org/10.5194/bg-8-3567-2011, https://doi.org/10.5194/bg-8-3567-2011, 2011
C. Höpfner and D. Scherer
Biogeosciences, 8, 3359–3373, https://doi.org/10.5194/bg-8-3359-2011, https://doi.org/10.5194/bg-8-3359-2011, 2011
F. Gao, S. Stanič, K. Bergant, T. Bolte, F. Coren, T.-Y. He, A. Hrabar, J. Jerman, A. Mladenovič, J. Turšič, D. Veberič, and M. Iršič Žibert
Biogeosciences, 8, 2351–2363, https://doi.org/10.5194/bg-8-2351-2011, https://doi.org/10.5194/bg-8-2351-2011, 2011
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