黄土沟壑区不同植被对产流产沙的影响

Influence of vegetation change on producing runoff and sediment in gully region of Loess Plateau

以甘肃西峰南小河沟小流域径流场为研究对象，采用横向对比分析的方法，在降雨量相同的条件下，对4种植被类型小区（农田、林地、人工草地和天然荒坡）进行了产流产沙、雨能和抗侵蚀能力的分析。结果表明，农田的径流系数最大，最高可达36．33％；林地的径流系数最小。基本在1％以下；农田的产沙量是林地的2～4倍，是天然荒坡的4～7倍；各种植被对雨能的影响不大；农田的抗侵蚀能力最差，其他3种植被小区相当。

The forms are studied It shows that the variety of runoff,sedi under the condition of runoff coefficient of f ment,power of rain and erosion resisting power of four vegetation the same rainfall in small watershed gully region of loess plateau. armland is the biggest 36.33%,the wooded land is the least,not more than 1%. The sediment yield of the farmland is 2-4 times more than that of the wooded land and 4- 7 times more than that of the natural wild land ;The influence of rain power in four vegetation forms is not obvious ;The effect of the farmland is worst in erosion resisting power,and the rest are almost the same.