Journal
AGRICULTURAL AND FOREST METEOROLOGY
Volume 151, Issue 5, Pages 544-553Publisher
ELSEVIER
DOI: 10.1016/j.agrformet.2010.12.012
Keywords
Heterogeneity; Advection; Populus fremontii; Flooding; Hydrology; Cottonwood
Categories
Funding
- John Muir Institute for the Environment
- CALFED
- Atmospheric Turbulence and Diffusion Division of NOAA
Ask authors/readers for more resources
The ecosystem fluxes of mass and energy were quantified for a riparian cottonwood (Populus fremontii S. Watson) stand, and the daily and seasonal courses of evapotranspiration, CO2 flux, and canopy conductance were described, using eddy covariance. The ecosystem-level evapotranspiration results are consistent with those of other riparian studies: high vapor pressure deficit and increased groundwater depth resulted in reduced canopy conductance, and the annual cumulative evapotranspiration of 1095 mm was more than double the magnitude of precipitation. In addition, the cottonwood forest was a strong sink of CO2, absorbing 310 g C m(-2) from the atmosphere in the first 365 days of the study. On weekly to annual time scales, hydrology was strongly linked with the net atmosphere-ecosystem exchange of CO2, with ecosystem productivity greatest when groundwater depth was similar to 2 m below the ground surface. Increases in groundwater depth beyond the depth of 2 m corresponded with decreased CO2 uptake and evapotranspiration. Saturated soils caused by flooding and shallow groundwater depths also resulted in reduced ecosystem fluxes of CO2 and water. (C) 2011 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available