Analysis on the Vegetation Change in Yanbian Area in Last Decade

Based on the MODIS/NDVI 250 m resolution data from 2000 to 2008,regional map and vegetation map,we analyzed the intra-annual and inter-annual variation of vegetation cover in Yanbian Area by using the HANTS,imagery processing methods and statistical methods.Then further analyses were carried into different sub-regions and different vegetation types.The results showed that the vegetation variation trends are increased in last decade,and the increase is particularly obvious in autumn.Zonal statistics showed that the vegetation covers in Yanji City and Longjing City are much better than Tumen City and other sub-regions.Apart from Antu County,the other regions had an NDVI increase trend and the trend in Wangqing County is the fastest.The vegetation covers of coniferous forests are the best in all five vegetation types.The NDVI of grassland and marshes are less than that of the coniferous forests,mixed forests and broadleaf forests.All types of vegetation cover are increasing,and grassland has a faster speed.