我县位于晋西北黄河东岸,于晋、陕、蒙交界处,是一个典型的黄土丘陵沟壑区。全县水土流失面积162万亩,占总面积的81％。沟壑密度每平方公里为3.74条。一到雨季夹带大量泥沙的洪水顺沟流入黄河。据测定,南曲沟流域的洪水含泥沙量达48％,没有覆盖的坡地每年降低1厘米的表土,每年每亩流失表土6.6方,折合肥土11吨。农村实行生产责任制以后,调 My county is located in the northwestern coast of Yellow River in Shanxi Province, Shanxi, Shaanxi and Mongolia junction, is a typical loess hill gully area. The county soil erosion area of ​​162 mu, accounting for 81% of the total area. Gully density of 3.74 per square kilometer. Once into the rainy season, a large amount of sediment flows along the ditch into the Yellow River. It has been determined that the flood waters in the Nanquangu valley contain 48% of the sediment, and the topsoil, which is not covered by the slopes, is reduced by 1 cm per year. Each year, the topsoil is lost to 6.6 square meters per mu, equivalent to 11 tons of soil. After the implementation of the production responsibility system in rural areas, transfer