Abstract:

Normal Difference Vegetation Index (NDVI) can represent the ground vegetation to some extent,which reflects the change of environment and global change.Currently,studies on vegetation change are mainly distributed in Shannxi Province,Gansu Province,Xinjiang Province etc.However,there are relatively few studies on temporal and spatial variation of vegetation and its impact factors in Jialing River Basin.Thus,with the support of GIS software,this study was to explore the temporal and spatial variation of vegetation and analyze the impact factors in Jialing River Basin using the GIMMS NDVI data and the linear correlation analysis method.The results are as follows:(1) In 1982~2006,the average NDVI in the whole basin gradually increased year by year.This was same with the other area,but their slope of linear regression equation was different.(2) The vegetation in Jialing River Basin was better than Loess Plateau and Northwest China.Spatial difference of vegetation was significant and NDVI in the southern district was less than northern district.(3) Spatial difference of vegetation variation was also significant.But slope of linear regression equation in the southern district was greater than northern district.(4) Spatial distribution of NDVI and its change in 1982~2006 was related to human activities and climate change.Based on these analyses,the results indicate that human activities such as soil and water conservation measures in the upper reach of the Yangtze River and climate change makes vegetation and environment better