淤地坝在流域水土保持措施中的贡献研究

淤地坝既能拦截泥沙、保持水土、又能淤地造田、增产粮食，在黄土高原地区已经有上百年的历史。研究淤地坝在流域水土保持措施中的贡献，已成为泥沙研究和水土保持研究的一项重要课题。本次研究以黄土高原典型流域马家沟为例，分析淤地坝在水土保持措施中的的贡献，研究结果表明：1990~2007年年均减沙量最大的是淤地坝，其次是梯田，依次为林地和草地。坝地的减沙量贡献率在1990~2000年为41.51%，在2001~2007年平均达到了46.58%。

The Contribution of Silt Dam for Soil and Water Conservation Measures

Silt dams can not only intercept sediment, conserve soil and water, but also silt wasteland and increase food. Loess Plateau has a history of one hundred years for silt dam. It has been an important topic of sediment and soil and water conservation research to study contribution of silt dam in soil and water conservation measures. The study takes Majiagou of the Loess Plateau watershed as a typical example, and analyzes the contribution of silt dam in soil and water conservation measures. The results from 1990 to 2007 show that the silt dam is the largest for annual average reduction of sediment, followed by terraces, followed by woodland and grassland. Contribution of silt dams to sediment reduction is 41.51% from 1990 to 2000,and 46.58% from 2001 to 2007.