祁连山寺大隆林区水土流失状况的初步研究  

A Preliminary Study of Water and Soil Erosion Conditions In Sidalong Forest Region in the Qilian Mountain Areas

作　　者：贺红元 车克钧[1] 傅辉恩[1] 张学龙[1] 

机构地区：[1]甘肃省张掖祁连山水源林研究所,734000

出　　处：《水土保持学报》1992年第1期48-56,共9页Journal of Soil and Water Conservation

摘　　要：根据祁连山寺大隆林区内不同植被类的12个径流观测场5年的观测资料,研究了降雨对不同程度放牧草地水土流失的影响。结果发现:降雨强度是影响地表产流的首要因子;有林地各植被类型小区均不产生水土流失现象;与中轻度型放牧草地相比,在相同降雨条件下,过度放牧草地的径流系数变化最显著,其年径流量及土壤年流失量皆最大,是流域内水土流失的主要源地。Based on the 5 years' data from 12 runoff plots with different vegetation covers in sidalong forest region in the Qilian mountains, the paper deals with the effects of rainfall upon water and soil erosion in grazing rangeland to some extent. The findings show that rainfall inten- sity is the important factor affecting surface runoff. No water and soil erosion occurs in the forest lands with different types of vegetation covers. In comparison with the medium and slight grazing rangelands, runoff coefficient varies significantly in overgrazing rangeland, whose annual runoff and soil losses are the most in the case of same rainfall. The overgrazing rangeland is the main source land of water and soil ero- sion in the watershed.

关 键 词：地表径流 降雨强度 土壤侵蚀 

分 类 号：S157.1[农业科学—土壤学]