Predicting soil moisture depletion beneath trembling aspen

Abstract
Soil moisture and potential evapotranspiration were monitored in four stands of Populustremuloides Michx. during two growing seasons. Measured soil moisture was compared with soil moisture predicted by four models: THIRSTY, SOGGY, Zahner's, and a simple water budget. THIRSTY, an original model incorporating many soil layers, root density, and a variable resistance to moisture flux, generally gave the best fit. Water uptake was related to relative root density.

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