罗玉沟流域坡面土壤侵蚀的研究

本文介绍了罗玉沟流域土壤侵蚀的基本特征,将流域坡面土壤侵蚀划分为梯田平台微度侵蚀、荒坡轻度侵蚀、农田缓坡侵蚀等7种侵蚀类型,采用定位观测和典型调查相结合的方法,测算了1987年流域坡面土壤侵蚀量,并用美国通用土壤流失方程式的推算值对测算的结果进行了验证。1987年罗玉沟流域坡面土壤侵蚀量约32.5万吨,其中农田层状侵蚀量约占总侵蚀量的42.6％,林草地鳞片状侵蚀量约占16.9％,细沟侵蚀量约占36.7％,浅沟侵蚀量约占4％。

Study on surface erosion of stones in Luoyugou watershed

Luoyugou watershed is typical in gullied rolling area in loess plateau,covering an area of 72.79 km2,in which the area of various slopes above gully bed is 63.14 km2,accounting for 86.8% of total watershed area.This paper introduces the characteristics of soil erosion in Louyugou watershed which is classified into seven types such as slight erosion on terraced land,waste slope and erosion on gentle slope of farmland.The soil loss of slope in 1987 is measured by observing on defined points and investigating on tapical places, the result was verified by the estimated value of USLE.The soil loss of slope in Louyugou watershed was about32.5×104 t in 1987, among which sheet erosion on farmland accounted for 42.6% of the total, 16.9% for sheel-shaped erosion in wood-grass-land, 36.7% for the rill erosion,and 4 % for shallow gullies.