湟水北岸坡耕地径流泥沙观测试验研究

Observe and Test on Runoff and Silt along Huangshui North-bank Slop Plough

总结分析了四年来对黄土丘陵沟壑区坡耕地径流泥沙的观测试验资料,结果表明,1、荒坡地的泥沙流失量大于作物地;2、作物的覆盖度低于30%以下则比荒坡地的泥沙流失量要大;3、大于25度以上的坡耕地,头两年产量虽然好,第三年后产量大幅度下降,造成大量的水土流失,故种多年生植物为佳。同时通过试验研究表明,在黄土丘陵区,泥沙流失量多数来源于坡耕地,因此,搞好坡耕地综合治理,是防治水土流失提高单位面积产量的关健措施。

Runoff and silt of slop cropland were summaried and analyzed along loess gull y region since 4 years . The results showed （ 1 ） silt wasteland is more than cropland. （ 2 ） Cropland sih will be more than wasteland if cropland cover degree is fewer 30%. （3） The first and the second year we can get good harvest in over 25° slop cropland, but the third year the yield will decreased greatly. And water and soil erosion will be strengthen. So that more perennial plant would be planted. Therefore, the key countermeasures of control water and soil erosion and get a good harvest is slop cropland control.