晋西黄土区森林植被对流域径流及产沙的影响

Effects of Forests on the Runoff of Small Watershed in Loess Plateau in Western Shanxi

本文以晋西黄土区吉县小流域为研究对象,通过利用MATLAB软件的系统聚类分析方法,对蔡家川嵌套流域中主沟道及6个小流域进行流域地形地貌属性相似性分析和分类的基础上,分析研究了在地形地貌特征相似流域类型中不同土地利用及森林覆盖率对流域径流过程的影响。分析结果表明,在流域地形地貌特征相似的条件下,森林植被具有减小流域雨季径流总量、增加流域枯水期径流的作用。通过对红旗林场的小流域对比分析表明,森林植被具有拦沙的作用。

Based on the quantitative analyzes on the similar topographical characteristics and classification of Caijiahuan watershed in the Loess Plateau in the western Shanxi province and its 6 branches by system clustering analyze of MATLAB , the effects of the forest coverage and land-use types on the runoff of small watersheds which have similar topographical characteristics are researched in this paper. Results show that the forests have the function of reducing the runoff in rain seasons and increasing the flow in low water season.