关键词: 毛乌素沙地, 沙漠化, 遥感监测

Abstract: Based on the analysis of the Landsat TM data(April 1987 and April 1993) and application of computer,we have carried out a project on the trends monitoring of desertified land in the Mu Us Sandy Land.The results indicate that the desertified land had decreased about 1 936 km² from 1987 to 1993 and kept a stable reversed situation in the overall statue,although there were some parts of the area had been suffered from a quick spread of desertification.Almost all of the reversed land come from those areas where the shifting dunes have been fixed by reforestation and fencing for vegetation protecting.But the reversed trend was not so clear to those desertified land which was used for cropping and grazing,so that the economic benefit of combating desertification was not so encouragement.By this project,we believe that to make full use of the remote sensing data for monitoring and assessing the desertification is one of the effective measure of quantitative research.

Key words: Remote sensing, Desertification, Mu Us Sandy Land