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南部山区发生的少数几次特大暴雨,致使典型薄层湿润风化土的土壤水蚀已经超过土壤流失允许值(T).一套I9年的流域资料是用来确定双季作物水保耕作对11次特大暴雨的抗蚀作用的.1972年6月～1991年6月间发生的那些大暴雨,其降雨量都超过100mm或侵蚀指数为1000MJmm/hm~2.h.加强水土保持耕作管理,能改善土壤的碳元素、水稳性团聚体及土壤保水性.早在20年前(1940年～1959年)就收集径流小区的资料,发展了通用土壤流失方程式,并验证了特大暴雨的发生次数和传统耕作措施对加速土壤侵蚀的作用.实践证明,水土保持耕作法成功地控制了南部山区由特大暴雨引起的土壤侵蚀.
A few heavy torrential rains in the southern mountainous areas have caused soil erosion in typical thin-layer wet weathered soils to exceed allowable soil loss values (T). A set of I9-year transmittable resources is provided for 11 times in defined dual- Heavy rainstorm, heavy rainstorm occurred between June 1972 and June 1991, with rainfall over 100mm or erosion index of 1000MJmm / hm ~ 2.h. Strengthening soil and water conservation tillage management can improve soil Carbon aggregates, water-stable aggregates and soil water retention. As early as 20 years ago (1940 ~ 1959) collected data on runoff plots, developed a common soil loss equation, and verified the occurrence of heavy rainfall and the traditional Tillage measures to speed up soil erosion. Practice has proved that soil and water conservation farming practices successfully control the southern mountainous area caused by heavy rainfall of soil erosion.