Water Movement from the Soil to the Atmosphere via Plants in an Evergreen Forest in Kampong Thom, Central Cambodia: The Important Role of Tall, Emergent Trees pp. 69-86
Authors: (Koji Tamai, Forestry and Forest Products Research Institute, Japan)
Abstract: The Indochinese peninsula was once dominated by an evergreen broad-leaved forest; now, only a small area of the original forest remains in Cambodia. Hydrological observations made in an evergreen forest in central Cambodia since 2003 indicate that seasonal variation in evapotranspiration is greater even in the late dry season than in the rainy season, corresponding to the seasonal course of the vapor pressure deficit. In this forest, the deep soil stayed wet and tall trees are thought to use deep soil moisture for transpiration even in the late dry season. Moreover, this forest had a smaller decoupling factor compared to other forests, suggesting that the imposed evapotranspiration related to the vapor pressure deficit has a greater effect on evapotranspiration in the region. Thus, evapotranspiration might be greater even in the late dry season than in the rainy season. The emergent trees were discussed to be cause the small decoupling factor in this forest.