THEORETICAL ANALYSIS OF FOREST-HYDRORESOURCE SYSTEM
森林-水资源系统的理论分析

The relationship between forest and hydroresource is discussed in this paper. Author holds that whether or not forest can increase precipitation and runoff deponds on the behaviour of fopest-hydroresource system that includes six subsets, such as forest, hydrology, soil, geography, meteorology and climate. A model of producing runoff is suggested and pionts out that some area of forest can produce more runoff than that of on fourest on certain condition, and the optimal hydroresource system must meet four criteria: 1. .don't bring about flood; 2. don't bring about soil erosion; 3. don't disturb local natural ecosystem; 4; produce hydro-resource as much as possible. Then, the effect of forestoon precipitation is analyzed, forest can change space distribution of precipitation and increase possibility of regional precipitation, because of two characters of forest as boundary layer of atmosphere: 1. "soft"; 2. intense exchange between fored and atmosphere. These are two forms of increasing precipitation. At last, several suggestions on the method for research in forest-hydroresource system are made.