Analysis grassland dynamics and its environment background based on digital platform-in case of Inner Mongolia

Using 1980s and 2000 TM as a primary data source and processing by atmosphere and geometric correction, we get dynamic coverage by visual interpreting under MGE environment. Then we select Inner Mongolia grassland dynamic coverage. In GRID, this coverage is changed into 100 m*100 m as a mask. According to the conditions of study area, we choose slope, aridity, soil erosion etc as environment background factors. We get environment background coverage under mask coverage. Finally, we combine the grassland coverage and every environment background coverage under GRID. The shifting farmland and grassland is main change of grassland in Inner Mongolia, whereas the shifting urban less, moreover grassland degradation is becoming serious. Grassland change fastens on several degrees of environment index because of region law restrict and transition characteristic, which lies the change value getting its max at middle index and min at both of end. What the grassland change happens cover the good environment, which shows the nature limit. The most bigness change area of grassland is high cover grassland and the most smallness is low cover grassland. With the degree of grassland cover decreasing, the grassland degradation is getting more serious.