黄土丘陵沟壑区坡面径流侵蚀试验研究

Experimental Study of Soil Erosion by Overland Runoff in the Rolling Gullied Loess Region

黄土丘陵沟壑区的水土流失主要由汛期一两次中大强侵蚀性暴雨引起。采用径流侵蚀模拟试验的结果表明,在农地、林地、草地、荒坡条件下,侵蚀率随时间的增加而逐渐减少;径流冲刷侵蚀量在坡度10°～26°之间是随着坡度的增加而增大的,坡度大于26°后趋于减小;径流侵蚀量随坡长的增加而增大。

Soil loss in the rolling gullied loess region is majorly caused by one or two large or medium intensity erosive rainstorms. Results reached by runoff-erosion simulating experiment indicated that: toe runoff erosion rate in farmland, forest land and grass land decreases with time; the amount of soil eroded by runoff raises with increase of slope grade on slopes between 10°-26° while tending to reduce when slope is more than 26°; the amount of runoff erosion raises with increase of slope length.