A MONITORING ANALYSE OF DESERTIFICATION DEVELOPMENT IN WESTERN JILIN OF CHINA BY LANDSAT TM DATA

Based on Landsat TM data from August to October in 1996 and 1988,we interpret desertification and calculate its dynamical quantity change during the two periods by supervised classification,and contrast this result with TM or MSS image films in 1976 and 1981.The result indicates that ecosystem environment in western Jilin worse further,desertification development and extending eastward,spreading to Song-Liao Plain in central Jilin.Salinizalion area in Daan County.which is the most serious in Jilin,is over 50% of the whole county.In Qianan County,salinization area increasement (7.87% of the whole county) is 269.77 km2 from 1988 to 1996.