晋西黄土区不同土地利用类型降雨-径流关系的研究

本文以北京林业大学山西吉县科研试验场蔡家川流域为研究对象,采用对比分析法,对降雨—径流关系进行了研究。分析得出在蔡家川流域雨强是影响地表径流的主要因素;由于整地等人工措施的影响,人工林水土保持效果好;对于农地、半牧半农等人为活动频繁的小流域,弱雨强时径流系数极小,大雨强时径流系数相对较大,尤其是半农半牧流域,水土流失严重;当雨量>20mm时,无林流域初损历时小于森林流域,小尺度流域的初损历时小于大尺度流域。

Research on Relationship Between Rainfall and Runoff in Different Land use Patterns on Loess Slope in West of Shanxi Province

This research was taken in the Caijiachuan watershed which is the scientific research field of Beijing Forestry University in the country of Ji in ShanXi province.The relationship between the rainfall and runoff was analyzed by the contrast method.It was concluded that the rainfall intensity was the main factor that influences the surface flow.The effect of water and soil conservation on artificial wool land was good because of the site preparation method.As for the land where were always affected by people's activities such as the farmland watershed and the agricultural and stock breeding watershed,the runoff coefficient was small when it rained slightly and big when it rained heavily.Especially in agricultural and stock breeding watershed,soil and water loss was severe.When the precipitation was more than 20 mm,the initial abstraction duration in watersheds with no forest vegetation is smaller than with forested watersheds,and the initial abstraction duration in small scale watersheds is smaller than that in bigger scale watersheds.