An analysis of soil moisture dynamics using multi-year data from a network of micrometeorological observation sites |
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| Authors: | Gretchen R Miller Dennis D Baldocchi Beverly E Law Tilden Meyers |
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| Institution: | 1. Department of Civil and Environmental Engineering, 760 Davis Hall, University of California–Berkeley, Berkeley, CA 94720-1710, United States;2. Department of Environmental Science, Policy, and Management, 137 Mulford Hall, University of California–Berkeley, Berkeley, CA 94720-3110, United States;3. College of Forestry, 328 Richardson Hall, Oregon State University, Corvallis, OR 97331, United States;4. Atmospheric Turbulence and Diffusion Division, National Oceanic and Atmospheric Administration, 456 S. Illinois Avenue, Oak Ridge, TN 37830, United States |
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| Abstract: | Soil moisture data, obtained from four AmeriFlux sites in the US, were examined using an ecohydrological framework. Sites were selected for the analysis to provide a range of plant functional type, climate, soil particle size distribution, and time series of data spanning a minimum of two growing seasons. Soil moisture trends revealed the importance of measuring water content at several depths throughout the rooting zone; soil moisture at the surface (0–10 cm) was approximately 20–30% less than that at 50–60 cm. A modified soil moisture dynamics model was used to generate soil moisture probability density functions at each site. Model calibration results demonstrated that the commonly used soil matric potential values for finding the vegetation stress point and field content may not be appropriate, particularly for vegetation adapted to a water-controlled environment. Projections of future soil moisture patterns suggest that two of the four sites will become severely stressed by climate change induced alterations to the precipitation regime. |
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| Keywords: | Soil&ndash plant&ndash atmosphere models Soil moisture AmeriFlux Ecohydrology Water stress Water balance Vadose zone Evapotranspiration |
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