Quantitatively Analyzed Vegetation Coverage and Its Dynamic Changes of Mulan County in Heilongjiang Province Based on RS and GIS

Vegetation cover not only takes as an import parameter for monitoring the vegetation situation of land surface , but also is an important indicator indicates the quality of the ecological environment and its changes. Therefore, in this paper , The Landsat TM images of 1989 and 2011 was used to extract the normalized difference vegetation index (NDVI) , then, the vegetation cover was obtained by NDVI using RS software ERDAS IMAGE 9.2, the results shown that : the increasing area of NDVI (0.2~0.3) was greatest, which was 141.41 km, on the contrary, the reduced area of NDVI (0.4~0.5) was 340.29 km, the lower vegetation coverage region covered the greatest increasing area, while the reduced area of higher vegetation coverage was maximum. Keywords-NDVI, RS; Vegetation cover; Mulan county