Transformation Dynamics of Desertification in Horqin Sandy Land at the Beginning of the 21st Century
21世纪初科尔沁沙地沙漠化土地变化趋势

Visual interpretation remarks were established by taking TM images in 2000 and 2005 as information source. Then desertification dynamic in Horqin Sandy Land in recent five years is monitored with the help of images and data processing function of GIS. The results showed that desertified land changed from 22423.1 km2 in 2000 to 22422.4 km2 in 2005, only at a reducing rate of 0.14 km2·a-1. This indicated that the constant aggravation of the desertification trend in the study area has been basically controlled and tends to be in a relatively stable state. The degree of transformation dynamics of desertification is different for different types of land, desertification degree has been mitigated evidently for the primary desertified land, and the difference is 958.9 km2 between reversal area and deteriorative area. At the same time, there are 113.3 km2 of non-desertified land desertification at a rate of 22.7 km2·a-1. Therefore, great attention should be paid to this phenomenon.