黄土沟壑区不同植被对产流产沙的影响

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。

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

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.