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基于遥感融合影像和GIS技术,借助通用土壤流失方程计算土壤侵蚀量,采用情景分析法,评价黄土丘陵沟壑区清水沟流域实施不同水土保持和退耕还林(草)措施对土壤侵蚀的影响。结果表明:水土保持措施减少土壤侵蚀的效益显著,相对而言,生物措施减少土壤侵蚀的效益强于工程措施,不同退耕还林(草)方案对流域总体土壤侵蚀影响差异较大。组合情景对土壤侵蚀影响很大,部分组合情景的土壤侵蚀甚至可低于土壤侵蚀背景值。
Based on remote sensing fusion image and GIS technology, the soil erosion amount was calculated by using the universal soil loss equation and the scenario analysis method was used to evaluate the effects of different measures of soil and water conservation and returning farmland to forestland on soil erosion in Qingshuigou watershed in loess hilly and gully regions. The results showed that the benefits of soil and water conservation measures to reduce soil erosion were significant. Relatively speaking, biological measures to reduce soil erosion were more effective than engineering measures. Different returns to forests (grass) schemes had significant impacts on overall soil erosion. The combined scenarios have a great influence on soil erosion, and the soil erosion in some combined scenarios may even be lower than the background value of soil erosion.