森林集水区水文效应的研究

对油松山杨林水区和经济过抚育间伐后的集水区进行了分析的结果表明：水文过程线主要取决于降雨过程，产流特点是径流系数小，洪水含沙量低。一方面两集水区的水文特片值均较小，充分体现了森林良好的水源涵养作用；另一方面，两集水区在洪水起伏量，水文响应，单位面积洪量方面差异不大，表明适量间伐对集水区水文状况的影响很小。本文针对森林集水区沟道洪水径流量与降雨量，降雨强度，前期降雨量，土壤水分条件关系密切的特点，建

Study of Hydrological Effect of Forest Catchment Areas

bservations and analyses of the Yousongshan popular batchment area and the tended/alternately deforested catchment area indicate that the hydrograph mainly depends upon the precipitation process.with a runoff producing feature of less runoff coefficient and lower sediment content. On the one hand, the hydrologic characteristic value of these two catchment areas is small which embodies the favorable moisture detention of the forest: on the other hand, these catchment areas have no significant difference in their flood fluctuation. hydrologic response and unit runoff yield, which implies that deforesting at proper intervals poses little impacts on the hydrology of the catchment area. Also. this paper provides a runoff reproducing empirical model in light of the stream runoff closely relating to precipitation amount and intensity. precipitation of the previous period, and .moisture of the soil.