Publications

Publications Found: 1437

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

An Assessment Of Corrections For Eddy Covariance Measured Turbulent Fluxes Over Snow In Mountain Environments
Reba, M. L., Link, T. E., Marks, D., Pomeroy, J.


Journal: Water Resources Research, Volume 45 (4): (2009). DOI: 10.1029/2008WR007045 Sites: US-Rwe

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

Self-Correlation Between Assimilation And Respiration Resulting From Flux Partitioning Of Eddy-Covariance CO2 Fluxes
Vickers, D., Thomas, C. K., Martin, J. G., Law, B.

Self-correlation between estimates of assimilation and respiration of carbon is a consequence of the flux partitioning of eddy-covariance measurements, where the assimilation is computed as the difference between the measured net carbon dioxide flux (NEE) and an …


Journal: Agricultural And Forest Meteorology, Volume 149 (9): 1552-1555 (2009). DOI: 10.1016/j.agrformet.2009.03.009 Sites: US-Me2

Biological And Physical Influences On The Carbon Isotope Content Of Co2 In A Subalpine Forest Snowpack, Niwot Ridge, Colorado
Bowling, D. R., Massman, W. J., Schaeffer, S. M., Burns, S. P., Monson, R. K., Williams, M. W.

Considerable research has recently been devoted to understanding biogeochemical processes under winter snow cover, leading to enhanced appreciation of the importance of many winter ecological processes. In this study, a comprehensive investigation of the stable carbon isotope composition (δ13C) of CO2 within a high-elevation subalpine …


Journal: Biogeochemistry, Volume 95 (1): 37-59 (2009). DOI: 10.1007/s10533-008-9233-4 Sites: US-NR1

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

Seasonal Hydrology Explains Interannual And Seasonal Variation In Carbon And Water Exchange In A Semiarid Mature Ponderosa Pine Forest In Central Oregon
Thomas, C. K., Law, B. E., Irvine, J., Martin, J. G., Pettijohn, J. C., Davis, K. J.

We analyzed 7 years (2002–2008) of micrometeorological and concurrent biological observations of carbon and water fluxes at a mature ponderosa pine forest in central Oregon in a semiarid climate. We sought to evaluate the extent that gross primary productivity, net ecosystem exchange, ecosystem respiration, net primary productivity, …


Journal: Journal Of Geophysical Research: Biogeosciences, Volume 114 (G4): n/a-n/a (2009). DOI: 10.1029/2009jg001010 Sites: US-Me2

Debut Of A Flexible Model For Simulating Soil Respiration–Soil Temperature Relationship: Gamma Model
Khomik M., Arain A. M.: Liaw K. L., McCaughey H. J.

A number of empirical models are used in literature to simulate the response of soil respiration (Rs) to soil temperature (Ts). The most widely used ones are the exponential Q10 model and the sigmoid-shaped Lloyd-Taylor and logistic models. None of these models are applicable across a wide range of ecosystems or climates, and none …


Journal: Journal Of Geophysical Research, Volume 114 (G3): n/a-n/a (2009). DOI: 10.1029/2008jg000851 Sites: CA-TP2

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

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