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Publications Found: 1373

Environmental And Vegetation Controls On The Spatial Variability Of CH4 Emission From Wet-Sedge And Tussock Tundra Ecosystems In The Arctic
McEwing, K. R., Fisher, J. P., Zona, D.

Aims

Despite multiple studies investigating the environmental controls on CH₄ fluxes from arctic tundra ecosystems, the high spatial variability of CH₄ emissions is not fully understood. This makes the upscaling of CH₄ …

Journal: Plant And Soil, Volume 388 (1-2): 37-52 (2015), ISBN . DOI: 10.1007/s11104-014-2377-1 Sites: US-Ivo

The Uncertain Climate Footprint Of Wetlands Under Human Pressure
Petrescu, A. M., Lohila, A., Tuovinen, J., Baldocchi, D. D., Desai, A. R., Roulet, N. T., Vesala, T., Dolman, A. J., Oechel, W. C., Marcolla, B., Friborg, T., Rinne, J., Matthes, J. H., Merbold, L., Meijide, A., Kiely, G., Sottocornola, M., Sachs, T., Zona, D., Varlagin, A., Lai, D. Y., Veenendaal, E., Parmentier, F. W., Skiba, U., Lund, M., Hensen, A., van Huissteden, J., Flanagan, L. B., Shurpali, N. J., Grünwald, T., Humphreys, E. R., Jackowicz-Korczyński, M., Aurela, M. A., Laurila, T., Grüning, C., Corradi, C. A., Schrier-Uijl, A. P., Christensen, T. R., Tamstorf, M. P., Mastepanov, M., Martikainen, P. J., Verma, S. B., Bernhofer, C., Cescatti, A.

Significant climate risks are associated with a positive carbon–temperature feedback in northern latitude carbon-rich ecosystems, making an accurate analysis of human impacts on the net greenhouse gas balance of wetlands a priority. Here, we provide a coherent assessment of the climate footprint of a network of wetland sites based …

Journal: Proceedings Of The National Academy Of Sciences, Volume 112 (15): 4594-4599 (2015), ISBN . DOI: 10.1073/pnas.1416267112 Sites: US-PFa

Vulnerability Of Crops And Native Grasses To Summer Drying In The U.S. Southern Great Plains
Raz-Yaseef, N., Billesbach, D. P., Fischer, M. L., Biraud, S. C., Gunter, S. A., Bradford, J. A., Torn, M. S.

The Southern Great Plains are characterized by a fine-scale mixture of different land-cover types, predominantly winter-wheat and grazed pasture, with relatively small areas of other crops, native prairie, and switchgrass. Recent droughts and predictions of increased …

Journal: Agriculture, Ecosystems & Environment, Volume 213: 209-218 (2015), ISBN . DOI: 10.1016/j.agee.2015.07.021 Sites: US-ARM

Extreme Drought Effects On Summer Evapotranspiration And Energy Balance Of A Grassland In The Southern Great Plains
Rajan, N., Maas, S. J., Cui, S.

We investigated the impact of the 2011 severe drought on summer evapotranspiration (ET) and energy partitioning of a managed Old World bluestem grassland in the Southern Great Plains and compared the results with those from 2010, a hydrologically wet year. Measurements of CO₂, latent heat (LE), and sensible heat (H) fluxes …

Journal: Ecohydrology, Volume 8 (7): 1194-1204 (2015), ISBN . DOI: 10.1002/eco.1574 Sites: US-LGr

Climatic Variability, Hydrologic Anomaly, And Methane Emission Can Turn Productive Freshwater Marshes Into Net Carbon Sources
Chu, H., Gottgens, J. F., Chen, J., Sun, G., Desai, A. R., Ouyang, Z., Shao, C., Czajkowski, K.

Freshwater marshes are well-known for their ecological functions in carbon sequestration, but complete carbon budgets that include both methane (CH₄) and lateral carbon fluxes for these ecosystems …

Journal: Global Change Biology, Volume 21 (3): 1165-1181 (2015), ISBN . DOI: 10.1111/gcb.12760 Sites: US-WPT

The Carbon Balance Pivot Point Of Southwestern U.S. Semiarid Ecosystems: Insights From The 21st Century Drought
Scott, R. L., Biederman, J. A., Hamerlynck, E. P., Barron-Gafford, G. A.

Global-scale studies indicate that semiarid regions strongly regulate the terrestrial carbon sink. However, we lack understanding of how climatic shifts, such as decadal drought, impact carbon sequestration across the wide range of structural diversity in semiarid ecosystems. Therefore, we used eddy covariance measurements to quantify …

Journal: Journal Of Geophysical Research: Biogeosciences, Volume 120 (12): 2612-2624 (2015), ISBN . DOI: 10.1002/2015JG003181 Sites: US-SRG, US-Whs, US-Wkg

Forest Ecosystem Respiration Estimated From Eddy Covariance And Chamber Measurements Under High Turbulence And Substantial Tree Mortality From Bark Beetles
Speckman, H. N., Frank, J. M., Bradford, J. B., Miles, B. L., Massman, W. J., Parton, W. J., Ryan, M. G.

Eddy covariance nighttime fluxes are uncertain due to potential measurement biases. Many studies report eddy covariance nighttime flux lower than flux from extrapolated chamber measurements, despite corrections …

Journal: Global Change Biology, Volume 21 (2): 708-721 (2015), ISBN . DOI: 10.1111/gcb.12731 Sites: US-GLE

Landscape-Level Terrestrial Methane Flux Observed From A Very Tall Tower
Desai, A. R., Xu, K., Tian, H., Weishampel, P., Thom, J., Baumann, D., Andrews, A. E., Cook, B. D., King, J. Y., Kolka, R.

Simulating the magnitude and variability of terrestrial methane sources and sinks poses a challenge to ecosystem models because the biophysical and biogeochemical processes that lead to methane emissions from terrestrial and freshwater ecosystems are, by their nature, episodic and spatially disjunct. As a consequence, model predictions …

Journal: Agricultural And Forest Meteorology, Volume 201: 61-75 (2015), ISBN . DOI: 10.1016/j.agrformet.2014.10.017 Sites: US-PFa

Divergence Of Actual And Reference Evapotranspiration Observations For Irrigated Sugarcane With Windy Tropical Conditions
Anderson, R. G., Wang, D., Tirado-Corbalá, R., Zhang, H., Ayars, J. E.

Standardized reference evapotranspiration (ET) and ecosystem-specific vegetation coefficients are frequently used to estimate actual ET. However, equations for calculating reference ET have not been well validated in tropical environments. We measured ET (ET_EC) using eddy covariance (EC) towers at two irrigated sugarcane …

Journal: Hydrology And Earth System Sciences, Volume 19 (1): 583-599 (2015), ISBN . DOI: 10.5194/hess-19-583-2015 Sites: US-SuS, US-SuW

Radiocarbon-based partitioning of soil respiration in an old-growth coniferous forest
Taylor, A.J., Lai, C.-T., Hopkins, F.M., Wharton, S., Bible, K., Xu, X., Phillips, C., Bush, S., Ehleringer, J.R.

Temperate forests play an important role in the global
carbon cycle, and are thought to currently be a sink for
atmospheric CO2. However,we lack understanding of
the drivers of forest carbon accumulation and loss,
hampering our ability to predict carbon cycle
responses to global change. In this study,we used CO2
flux and radiocarbon …

Journal: Ecosystems, Volume 18: 459-470 (2015), ISBN . DOI: Sites: US-Wrc

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