基于IIDD的盐池县荒漠化动态变化研究

esertification is widely recognized as one of the most serious global environmental threats occurring in ecological fragile areas.To assess desertification at a regional scale is of practical significance in understanding environmental change and strengthening ecosystem management.This paper take yanchi county as study area, with the same seasonal TM images of 1986、1989、1995、1999、2003、2006 and 2010 as foundation data sources, interpreted the TM Images using the method of human-computer interactive interpretation, acquired the desertification data of different period and different desertification degree of the study area. Constructed the model of Intergrated Index of desertification degree, studied the dynamic changes of desertification in 25 years. The results showed that from 1986 to 1995 years, desertification had development trend in study area, from 1995 to 2010 years, desertification had reversed trend.