中文摘要：

基于RS和GIS技术，以2000年和2007年TM影像为信息源，建立目视解译标志，利用ER—DAS的图像和数据处理功能，对镶黄旗北部沙地2000年以来沙漠化动态变化进行了监测。结果表明，监测期内未沙漠化和轻度沙漠化土地面积增加262．7km^2，具有明显增加的趋势。中度、重度沙漠化土地面积均减少，减少面积分别为220．6km^2和42．1km^2。沙漠化土地逆转过程中，中度和重度沙漠化土地逆转较为明显；新增沙漠化土地中，轻度和中度沙漠化土地所占比例较大。从整体来看，沙漠化已呈逆转的趋势，整个区域的生态环境在改善。

英文摘要：

The dynamics of sand desertification degree in north Xianghuang Banner, Inner Mongolia since 9.000 were monitored with the help of images and data processing function of ERDAS. The results showed that during the monitoring period, none and slight desertification lands increased by 262.7 km^2, the moderate and serious desertification lands have decreased by 220. 6 km^2 and 42. 1 km^2 respectively. The reversed desertification lands mainly came from the moderate and serious desertification types; the newly increased desertifieation land mainly happened in the slight and moderate desertification lands. Overall, the trend of desertification has been reversed and the whole environment has been improved.