NDVI variation and its relation with main climatic factors in the watershed ofNujiang River in Tibetan Autonomous Region

The spatial and temporal variation of NDVI in the watershed of Nujiang River in Tibetan Autonomous Region was studied by using each ten day period maximization NDVI data set (S10) product from December 1998 to November 2008. The result indicated that vegetation was good and little change occurred. With the data of monthly mean temperature, precipitation and sunshine from December 1998 to November 2008 at 9 meteorological stations in this region, the relation between NDVI and the climate factors was studied and it was found that the temperature in April might influence the regreening in terms of accumulated temperature, and the temperature in May, June and July affected the grass growth.