抄録
This study explores preliminarily the effect of the two driving forces, gravity and matric potential, on the soil water movement and its regional characteristics. Three numerical experiments were conducted using a land surface model with the atmospheric forcing data at global scale. An experiment included both driving force, while the other included only a force out of the two. Our results show some important characteristics as follows. Global annual mean of water budget and that of heat one is almost same between the three experiments. Each driving force contributes to some percentile of total soil water storage but it has different characteristics at each region. Matric potential force has significant seasonal variation and contributes to some ten percentage of water content while gravity force has small variation and contirbutes to some percentage.
