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为了探求陕北黄土丘陵沟壑区坡面水土流失规律和植被蓄水保土效益,给防治水土流失提供依据。于1978年进行了不同植被类型的小区径流泥沙观测试验,测验结果整理分析如下: 一、试验区的自然条件 试验布设在安塞县水土保持实验区的县南沟流域,其侵蚀地貌属黄土丘陵沟壑区第二副区。流域面积50.6平方公里,沟壑密度4.4公里每平方公里。地面坡度从上向下分为四类:(1)梁峁顶部平缓,一般3—10°;(2)梁峁坡较陡,一般15—25°,有的30°;
In order to explore the slope soil erosion law and the benefits of vegetation water and soil conservation in the loess hilly and gully region of northern Shaanxi, provide basis for prevention and control of soil erosion. In 1978, different types of vegetation runoff sediment tests were conducted. The test results were analyzed as follows: 1. The natural conditions in the experimental area were distributed in Xiannangou watershed in the experimental area of Ansai County soil and water conservation. The erosion landscape was loess Hilly and gully area second vice district. The basin area of 50.6 square kilometers, gully density of 4.4 kilometers per square kilometer. The slope of the ground is divided into four categories from top to bottom: (1) The top of the beam is gentle, usually 3-10 °; (2) The beam is steep, generally 15-25 ° and some 30 °;