Abstract:

The Jinsha River Basin is the ecologyfragile region in the upper reaches of the Yangtze River.It is also the major areas of ecological construction projects such as the major control engineering of soil and water conservation in upper and middle Yangtze River,the protection project of natural forests and the returning cultivated land to forestry project.The effects of ecological construction projects on vegetation in the Jinsha River Basin is calculated by using the linear correlation analysis method with the support of GIS software based on the SPOT VEGETATION NDVI (Normalized Difference Vegetation Index) from 1999 to 2008.The results show that from 1999 to 2008,the dimensional distribution of annual mean NDVI was observably different.There was a significant increase trend in the annual mean NDVI.The NDVI of farmland vegetation increased fastest,and the NDVI of shrub vegetation increased most significantly.The dimensional distribution of seasonal means NDVI and seasonal variation was observably different,the pixels whose NDVI significantly increased occupied 165%,83%,117% and 1403%,respectively,in spring, summer,autumn and winter.In spring,summer and autumn,the increase trend in the annual mean NDVI were dominant by the increase of shrub vegetation NDVI,but it was dominant by the increase of grass NDVI in winter.Based on these analyses,the results indicate that the ecological construction projects and climate change makes vegetation and environment better in the Jinsha River Basin