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), ISBN . DOI: 10.1016/j.agrformet.2009.03.009 Sites: US-Me2
Much of the 191.8 Pg C in the upper 1 m of Arctic soil of Arctic soil organic mater is, or is at risk of, being released to the atmosphere as CO2 and/or CH4. Global warming will further alter the rate of emission of these gases to the atmosphere. Here we quantify the effect of major environmental variables affected …
Journal: Global Biogeochemical Cycles, Volume 23 (2): n/a-n/a (2009), ISBN . DOI: 10.1029/2009GB003487 Sites: US-Bes
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), ISBN . DOI: 10.5194/bg-6-1115-2009 Sites: US-Los
Climate variability and human activities interact to increase the abundance of woody plants in arid and semi-arid ecosystems worldwide. How woody plants interact with rainfall …
Journal: Ecohydrology, Volume 3 (1): 20-27 (2009), ISBN . DOI: 10.1002/eco.91 Sites: US-SRM
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), ISBN . DOI: 10.1016/j.jhydrol.2008.12.021 Sites: CA-SF1, CA-SF2, CA-SF3
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), ISBN . DOI: 10.1029/2008jg000851 Sites: CA-TP2
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), ISBN . DOI: Sites: US-Wrc
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), ISBN . DOI: 10.1111/j.1365-2486.2009.01952.x Sites: US-Wrc
This study examines how stand age affects ecosystem mass and energy exchange response to seasonal drought in three adjacent Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) forests. The sites include two early seral (ES) stands (0-15 years old) and an old-growth (OG) (~ 450-500 years old) forest in the Wind River Experiment Forest, …
Journal: Tree Physiology, Volume 29: 959-974 (2009), ISBN . DOI: 10.1093/treephys/tpp039 Sites: US-Wrc
Journal: J. Agric. Meteorol., Volume 65: 47-60 (2009), ISBN . DOI: Sites: US-Uaf