从土壤侵蚀角度讨论华南降水特征

A Study on Rainfall in South China from the View of Soil Erosion

华南降雨强度大且雨季长,导致严重土壤侵蚀发生的潜在可能性极大。全省各地的最大降雨强度超过了花岗岩地区土壤的入渗率,显然,降雨不是华南土壤侵蚀的限制因素。就全省范围来说,降雨的地方性差异与侵蚀区分布之间,不存在明显的关系。但对于一定地区,降雨的时间和量值对土壤侵蚀也起着控制的作用。

In Guangdong Province, South China, the rainfall intensities can be rather high and rainy season can last long. These intense rainfall events provide very high potential for soil erosion. The intensities of rainfall usually exceed the infiltration rates for most soils in weathereogranitic areas, it may be seen that rainfall is nowhere a limiting factor for soil erosion. However, the distribution of eroded areas is not so much the result of rainfall variations. In certain area the timing and magnitude of rain controls the erosivity of the land.