降雨与植被耦合关系对土壤侵蚀的影响分析——以密云水库上游为例

基于TRMM降雨降雨资料时间序列数据和MODIS-NDVI16d合成产品的时间序列数据,分析密云水库上游降雨与植被的耦合关系对侵蚀的影响。结果表明：（1）侵蚀将发生在降雨强度大,同时植被覆盖差的时段,而密云水库上游地区植被的年内生长曲线形态与降雨的分布形态相似性较大,表明研究区的植被具有较好的保护水土能力;（2）研究区侵蚀主要发生在7—8月,而在1—3月以及11—12月几乎不会发生侵蚀;（3）研究区侵蚀的发生与植被覆盖有很紧密的联系,大部分的侵蚀发生在植被覆盖差的＂其他＂类内。研究方法可以清楚地了解研究区内降雨与植被的耦合关系及对侵蚀的影响,研究的结果将为在年内选择具有代表性的时段分析侵蚀状况提供很好的参考资料。

Analysis of impact of correlation between rainfall time-series and vegetation time-series on water soil erosion: A study of Miyun reservoir upstream area

Impact of correlation between rainfall time-series and vegetation time-series on water soil erosion was analyzed based on TRMM rainfall and MODIS-NDVI in Miyun reservoir upstream area. The results show that （1） Much erosion will occur when high-intensity rainfall coincides with limited soil protection. The shape of rainfall distribution and vegetation changing curve are consistent, and their peak values almost appear in the same time. This combination mode is in favor of water and soil conservation. （2） The soil erosion mainly appears between July and August, while almost no erosion between January – March and November – December. （3） In the Miyun reservoir upstream area, soil erosion is closely correlative with vegetation cover. Most erosion appears on the land cover of ＂other type＂ with sparse vegetation. The approach presented in this paper can distinctly show the correlation between rainfall and vegetation in time dimension, which will benefit analysis of erosion status.