甘肃黄土丘陵沟壑区水土流失及控制技术与效益研究

甘肃黄土丘陵沟壑区治理程度较高的流域 ,前期坝库拦蓄的泥沙主要来源于坝库区沟岸的重力侵蚀 ,其泥沙量占坝库拦蓄泥沙总量的 83 63 % ,坡面侵蚀仅占 16 3 7%。水土保持措施数量的增加与流域产沙量的减少多为非线性关系 ,荒坡、坡耕地是主要产流区 ,梯田是坡面主要的拦蓄措施。治理措施分布的时空顺序不同 ,所形成的治理模式也不同 ,在治理程度相近的情况下水保效益差异显著。水土保持是生态环境建设的基础 ,是农业和农村经济持续发展的生命线

Beneficial Study on Soil and Water Loss and Controlling Technology for Gullied Rolling Loess Area in Gansu Province

The sediment retained by dams at early stage in the watersheds where the treatment degree is higher in the gullied rolling loess area of Gansu is mainly gravity erosion coming from gullies and banks of reservoir areas. The amount of sediment makes up 83.63% of the total sediment retained by dams and slope erosion only occupies 16.37%? The increase of soil and water conservation measures and the reduction of basin sediment production usually are shown as non linear relationship. Waste slopes and sloped lands are the main yield areas and terraced fields are the main retention measure for slopes. The different temporal and spatial distribution of treatment measures forms different treatment modes and results in remarkable difference in the benefits of soil and water conservation even under the similar conditions. Soil and water conservation is the basis for ecological environment construction and also the lifeline for sustainable development of agriculture and rural economy.