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| 蒲河流域降雨侵蚀力时空分布规律分析
摘要：降雨侵蚀力时空分布规律是研究土壤侵蚀预报的基础，是反映流域降雨对土壤侵蚀程度的重要指标。根据蒲河流域9个水文气象站的日降雨量资料，分析蒲河流域的降雨侵蚀力时空分布规律。研究可知:蒲河流域在37年的长系列中，年降雨量与年降雨侵蚀力的变化趋势都呈逐步上升趋势，其变化趋势并不明显。全年降雨侵蚀力主要集中在6～9月，年内降雨侵蚀力的高峰值则主要出现在8月，年内降雨侵蚀力的分布呈明显的单峰型。蒲河流域多年平均降雨侵蚀力变化趋势大致由流域的东北部向西南部逐步降低。
关键词：降雨侵蚀力；日降雨量；时空分布规律；蒲河流域
Abstract：Rainfall erosivity is one of the comprehensive index reflect the ability of rainfall erosion,the research on the laws of the time and space distribution of rainfall erosivity is the foundation of soil erosion prediction. According to the nine hydrological stations daily rainfall data,the daily rainfall erosivity model was used to analysis PuHe basin rainfall erosivity of space and time distribution. Results show that during the past 37 years,the annual rainfall and rainfall erosivity in the Puhe River Basin showed a gradually increasing trend, but the changing trend was not obvious. The annual rainfall erosivity is mainly concentrated in June to September, and the annual rainfall erosivity peaks mainly in August. The distribution of rainfall erosivity in the year shows an obvious unimodal pattern.The trend of the average rainfall erosivity changes is gradually decreasing from northeast to southwest of the basin.
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