黄土高原水土保持减沙效益的尺度效应初步分析

Study of Scale Dependence of Sediment Yield Reduction by Soil Conservation Practices

收集了黄土高原64个不同大小流域的水土保持措施减沙效益的资料和研究成果,利用这些资料分析了随着流域尺度的变化黄土高原水土保持措施减沙效益的变化。统计分析结果显示,水土保持措施减沙模数随流域面积没有明显的变化趋势,单位治理面积减沙比与流域面积之间也不存在明显关系。

For investigating the changes of sediment yield reduction by soil conservation with spatial scale, this study collected data of the areas implementing soil conservation measures and the amounts of sediment yield reduction associated with soil conservation measures for 64 eatehments with different sizes in the middle Yellow River. The soil conservation measures in discussion include land terracing, tree and grass planting, land creating behind sediment-checking dams. Results show that the reduction of specific sediment yield due to implementation of soil conservation measures does not present a significant trend of increase or decrease with the increase of catchment size.