土壤侵蚀的雨量标准研究初报

Initial Research Report on Rainfall Standard of Soil Erosion

拟定和建立土壤侵蚀的雨量标准 ,旨在区分发生和不发生土壤侵蚀的降雨事件 ,从而可以减少计算降雨侵蚀力的工作量 ,进而在此环节上 ,为提高土壤侵蚀预报精度提供可能和条件。选取位于皖南山区的歙县华源河流域内所设置的 3个径流小区的实测资料为分析样本 ,以此推求出其侵蚀性降雨雨量标准依次为 13 6、14 6和14 7mm。按此标准 ,可剔除降雨场次 5 0 %以上 ,而漏选的土壤流失量占总侵蚀量的比例在 3%以内。

To study out and establish rainfall standard of soil erosion aims at distinguishing happening soil erosion rainfall or not, which can reduce workload to compute rainfall erosion force and therefore the possibility and condition of increasing precision of soil erosion forecasting will be provided. Tested materials of three runoff plots of Huayuan river watershed in She county of southern mountainous area in Anhui are taken as samples that inquires into erosion rainfall amount standard which is 13.6mm 14.6mm and 14.7mm in turn. According to that standard, 50% of the number of rainfall can be eliminated and soil erosion volume which failed to choose takes up 3% of total erosion amount.