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使用经验正交函数和非参数统计检验方法,对重庆市1960-2010年全年、季节降雨侵蚀力时空格局进行分析。结论如下:①年、季降雨侵蚀力均呈东北、东南偏大,西部偏小的空间格局。②受大尺度气候因素影响,年、季降雨侵蚀力表现为一致性异常分布特征,2000年后年、季降雨侵蚀力增大的年份偏多。③受山地地形影响,全年、秋季和冬季降雨侵蚀力存在反相变化模态,重庆市东北(集中在城口、开县区域)降雨侵蚀力变化趋势与其他区域存在差异。
Using the empirical orthogonal function and nonparametric statistical test, the spatial and temporal patterns of rainfall erosivity in Chongqing from 1960 to 2010 were analyzed. The conclusions are as follows: ①The annual and seasonal rainfall erosions are all in the northeast, southeast, and western regions. (2) Influenced by the large-scale climatic factors, the annual and seasonal rainfall erosivities are characterized by anomalous distribution of anomaly. In the year 2000 after 2000, the season rainfall erosivity increases more. ③ Due to the influence of mountainous terrain, there exists an anti-phase change pattern of rainfall erosivity all the year round, autumn and winter. The trend of rainfall erosivity in the northeast of Chongqing (concentrated in Chengkou and Kai County) is different from other regions.