基于Sen+Mann-Kendall的北京植被变化趋势分析

摘要

基于1998年到2011年长时序SPOT VEGETATION归一化植被指数数据,采用一元线性回归斜率变化法和Sen+Mann-Kendall法对北京地区的植被变化趋势做了时空分析.实验结果表明:在1998年到2011年期间,北京市城区、延庆县、怀柔区和平谷区的植被变化趋势显著上升；而植被恶化区则集中在北京市城区北部、东部和南部,并以马蹄形包围北京市区.两种方法实验结果在植被上升(下降)区域具有一致性.同时,Sen+Mann-Kendall法以其良好的抗噪性和对数据分布无要求性可广泛应用到其他区域的植被变化趋势分析中.%The spatial distribution and dynamic change of vegetation cover in Beijing are analyzed based on SPOT VEGETATION' s NDVI data from 1998 to 2011 using the method of slope of linear regression and Sen+Mann-Kendallanalysis. Experimental results show that the vegetation's change is significantly increased in the following areas: the urban of Beijing city, Yanqing county, Huairou and Pinggu district. On the contrary, the vegetation' s decreasing areas locate at the north, east and south of the urban district in Beijing and surround like a Horseshoe-shaped. The two methods 'sresults have good spatial consistency in increasing (or decreasing) vegetation coverregions. Sen + Mann-Kendall analysis can be widely applied in other areas for detecting the trends of vegetation' s change thanks to its noise immunity and without requirements of data distribution.