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降雨侵蚀力反映由降雨引起的土壤侵蚀的潜在能力。利用广东省25个站点48年(1960—2007年)的日雨量资料计算了广东省的降雨侵蚀力,并采用线性倾向估计、M-K突变分析和小波分析等方法对广东省降雨侵蚀力进行趋势、突变和周期的诊断分析。结果表明48年来广东省年降雨侵蚀力呈增加趋势,春、夏、冬三季降雨侵蚀力呈上升趋势,秋季降雨侵蚀力呈下降趋势,但变化趋势均不显著。广东省年降雨侵蚀力在48年内未出现明显的突变现象,夏秋两季在1980年代末—1990年代初发生了突变,而春冬两季则无突变现象发生;年降雨侵蚀力和四季降雨侵蚀力均存在4个左右的周期变化。
Rainfall Erosivity reflects the potential of soil erosion caused by rainfall. The rainfall erosivity of Guangdong Province was calculated based on the daily rainfall data of 25 stations in Guangdong Province from 1960 to 2007 (1960-2007). The trend of rainfall erosivity in Guangdong Province was analyzed by linear tendency estimation, MK mutation analysis and wavelet analysis. Mutation and cycle diagnostic analysis. The results showed that the annual rainfall erosivity of Guangdong Province increased in the past 48 years, and the rainfall erosivity in spring, summer and winter tended to increase. The rainfall erosivity decreased in autumn, but the change trend was not significant. There was no obvious abrupt change of annual rainfall erosivity in Guangdong Province in 48 years. In summer and autumn, there was a sudden change in the late 1980s-early 1990s, but no sudden change in spring and winter seasons. Annual rainfall erosivity and seasonal rainfall erosion There are about 4 cycles of force variation.