青海省都兰县NDVI变化及影响因子研究  

Variations and Impact Factors of NDVI in Dulan County of Qinghai Province

作　　者：常进[1] 张克斌[1] 边振[1] 程中秋[1] 王黎黎[1] 肖红霞[1] 

机构地区：[1]北京林业大学水土保持学院水土保持与荒漠化防治教育部重点实验室,北京100083

出　　处：《水土保持通报》2011年第5期204-207,229,共5页Bulletin of Soil and Water Conservation

基　　金：国家"十一五"科技支撑项目"青海省高寒沙地退化植被恢复技术研究与试验示范(都兰)"(2006BAD26B1001)

摘　　要：研究植被覆盖的动态变化可以探知荒漠化的动态变化。利用青海省都兰县2000—2009年MO-DIS,NDVI数据对该区的植被动态变化进行了监测,并在此基础上对NDVI的变化与气温、降水的相关性进行了研究。结果表明,2000—2009年都兰县的NDVI总体上呈缓慢的上升趋势,上升率为0.002 9/a,NDVI值年内变化具有很强的季节性,NDVI值总体水平不高,最大值仅为0.22;全县39.71%的面积植被明显改善,主要位于查查河、察汗乌苏河以及柴达木河下游的大片区域,17.74%面积出现植被退化,主要位于柴达木河中上游河岸周围的广大区域,荒漠化治理有待进一步加强。气温和降雨是影响该区植被状况的主导自然因子,5—9月的气温与NDVI极显著相关(p<0.01),5—9月的降雨量与NDVI显著相关(p<0.05),气温对NDVI的影响强于降水。The knowledge of vegetation cover changes will provide considerable insights into the dynamic process of desertification.The study illustrated the vegetation dynamic changes in Dulan County,Qinghai Province using 2000—2009 MODIS NDVI data,and on this basis,the relationship between NDVI changes with temperature and rainfall variations were investigated,providing the basic data to land use planning in alpine areas and desertification prevention and control.The results indicate that the NDVI values of the area presented a slow ascendant trend from 2000 to 2009,at the rate of 0.002 9/a.The NDVI values had a strong seasonal changes in a year,but the overall NDVIs were not high for the county,with the maximum value of 0.22.The vegetation condition were improved significantly in 39.71% of the area of the entire county,which mainly located in basins of Chacha river and Chahanwusu river and a large area of Qaidam river downstream.However,the vegetation degeneration was found in the upper and middle reaches of Qaidam river,accounting for 17.74% of the entire county,suggesting that the desertification control should be further strengthened.The temperature and rainfall were the two main natural factors influencing the NDVI dynamics of the county;the NDVIs correlated strongly significantly with the temperature（p0.01）,and significantly with the rainfall amount（p0.05） from May to September annually.The impact of the temperature on the NDVI was stronger than that of the precipitation.

关 键 词：青海省都兰县 NDVI 降水 气温 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]