Publications

Publications Found: 1230
Contrasting Carbon Dioxide Fluxes Between A Drying Shrub Wetland In Northern Wisconsin, USA, And Nearby Forests
Sulman, B.N.,  Desai, A.R., Cook, B.D., Saliendra, N., Mackay, D.S.

Wetland biogeochemistry is strongly influenced by water and temperature dynamics, and these interactions are currently poorly represented in ecosystem and climate models. A decline in water table of approximately 30 cm was observed at a wetland in Northern Wisconsin, USA over a period from 2001–2007, which was highly correlated …


Journal: Biogeosciences, Volume 6 (6): 1115-1126 (2009). DOI: 10.5194/bg-6-1115-2009 Sites: US-Los

Impact Of Reduced Tillage And Cover Cropping On The Greenhouse Gas Budget Of A Maize/Soybean Rotation Ecosystem
Bavin, T., Griffis, T., Baker, J., Venterea, R.

Agricultural ecosystems have been viewed with the potential to sequester atmospheric carbon dioxide (CO2) by increasing soil organic carbon (SOC) through reduced tillage and cover cropping practices. There remains considerable uncertainty, however, regarding the …


Journal: Agriculture, Ecosystems & Environment, Volume 134 (3-4): 234-242 (2009). DOI: 10.1016/j.agee.2009.07.005 Sites: US-Ro1

Measuring Boreal Forest Evapotranspiration Using The Energy Balance Residual
Amiro, B.

The eddy covariance technique is the most common method of measuring forest evapotranspiration directly. Evapotranspiration can also be estimated by solving for the residual of the energy balance measurements of net radiation, sensible heat flux density and ground heat flux density. However, the lack of energy balance closure of …


Journal: Journal Of Hydrology, Volume 366 (1-4): 112-118 (2009). DOI: 10.1016/j.jhydrol.2008.12.021 Sites: CA-SF1, CA-SF2, CA-SF3

Comparison Of Carbon Dynamics And Water Use Efficiency Following Fire And Harvesting In Canadian Boreal Forests
Mkhabela, M., Amiro, B., Barr, A., Black, T., Hawthorne, I., Kidston, J., McCaughey, J., Orchansky, A., Nesic, Z., Sass, A., Shashkov, A., Zha, T.

Fire and harvesting are major forest renewal processes in the Canadian boreal forest. The eddy covariance method was used to compare ecosystem fluxes of carbon dioxide between harvested and burned boreal forest sites in Saskatchewan, Canada. The harvest chronosequence had …


Journal: Agricultural And Forest Meteorology, Volume 149 (5): 783-794 (2009). DOI: 10.1016/j.agrformet.2008.10.025 Sites: CA-SF1, CA-SF2, CA-SF3

Turbulence considerations for comparing ecosystem exchange over old-growth and clear-cut stands for limited fetch and complex canopy flow conditions
Wharton, S., Schroeder, M., Paw U, K.T., Falk, M., Bible, K.

Carbon dioxide, water vapor, and energy fluxes were measured using eddy covariance (EC) methodology over three adjacent evergreen forests in southern Washington State to identify stand-level age-effects on ecosystem exchange. The sites represent Douglas-fir forest ecosystems at two contrasting successional stages: old-growth (OG) …


Journal: Agricultural and Forest Meteorology, Volume 149: 1477-1490 (2009). DOI: Sites: US-Wrc

Soil Evaporation Response To Lehmann Lovegrass (Eragrostis Lehmanniana) Invasion In A Semiarid Watershed
Moran, M. S., Scott, R. L., Hamerlynck, E. P., Green, K. N., Emmerich, W. E., Holifield Collins, C. D.

Across the western United States, warm-season grasslands are being invaded by the exotic perennial grass, Eragrostis lehmanniana (Lehmann lovegrass). The objective of this study was to quantify the change in surface water balance, particularly the evaporation from bare soil, associated with E. lehmanniana invasion. …


Journal: Agricultural And Forest Meteorology, Volume 149 (12): 2133-2142 (2009). DOI: 10.1016/j.agrformet.2009.03.018 Sites: US-Wkg

Partitioning Evapotranspiration In Semiarid Grassland And Shrubland Ecosystems Using Time Series Of Soil Surface Temperature
Moran, M., Scott, R., Keefer, T., Emmerich, W., Hernandez, M., Nearing, G., Paige, G., Cosh, M., O’Neill, P.

Information about the ratio of transpiration (T) to total evapotranspiration (T/ET) is related to critical global change concerns, including shrub encroachment and non-native species invasion. In this study, a new approach was developed to partition measurements …


Journal: Agricultural And Forest Meteorology, Volume 149 (1): 59-72 (2009). DOI: 10.1016/j.agrformet.2008.07.004 Sites: US-Whs, US-Wkg

Soil Co2efflux In Contrasting Boreal Deciduous And Coniferous Stands And Its Contribution To The Ecosystem Carbon Balance
GAUMONT-GUAY, D., BLACK, T. A., MCCAUGHEY, H., BARR, A. G., KRISHNAN, P., JASSAL, R. S., NESIC, Z.

Similar nonsteady-state automated chamber systems were used to measure and partition
soil CO2 efflux in contrasting deciduous (trembling aspen) and coniferous (black spruce
and jack pine) stands located within 100km of each other near the southern edge of the
Boreal forest in Canada. The stands were exposed to similar climate …


Journal: Global Change Biology, Volume 15 (5): 1302-1319 (2009). DOI: 10.1111/j.1365-2486.2008.01830.x Sites: CA-Oas, CA-Obs, CA-Ojp

Strong links between teleconnections and ecosystem exchange found at a Pacific Northwest old-growth forest from flux tower and MODIS EVI data
Wharton, S., Chasmer, L., Falk, M., Paw U, K.T.

Variability in three Pacific teleconnection patterns are examined to see if net carbon exchange at a low-elevation, old-growth forest is affected by climatic changes associated with these periodicities. Examined are the Pacific Decadal Oscillation (PDO), Pacific/North American Oscillation (PNA) and El Niño-Southern Oscillation …


Journal: Global Change Biology, Volume 15: 2187-2205 (2009). DOI: 10.1111/j.1365-2486.2009.01952.x Sites: US-Wrc

Influence Of Clouds And Diffuse Radiation On Ecosystem-Atmosphere Co2and Co18o Exchanges
Still, C. J., Riley, W. J., Biraud, S. C., Noone, D. C., Buenning, N. H., Randerson, J. T., Torn, M. S., Welker, J., White, J. W., Vachon, R., Farquhar, G. D., Berry, J. A.

This study evaluates the potential impact of clouds on ecosystem CO2 and CO2 isotope fluxes (“isofluxes”) in two contrasting ecosystems (a broadleaf deciduous forest and a C4 grassland) in a region for which cloud cover, meteorological, and isotope data are available for driving the isotope‐enabled land surface model (ISOLSM). …


Journal: Journal Of Geophysical Research, Volume 114 (G1): (2009). DOI: http://doi.org/10.1029/2007JG000675 Sites: US-ARM