A study of forest evapotranspiration restraint due to the soil water content

Abstract

The forest evapotranspiration is estimated using the short-term period water-budget method with correction of the amount of forest soil-water storage calculated by “exponential tank model”. Forest evapotranspiration is also calculated using heat balance method in which seasonal variation of evaporation efficiency β is assumed. With comparing the both values of evapotranspiration, it is found that forest evaporation efficiency in Japan is rarely restrained by the forest soil-water content.