科尔沁沙地沙漠化动态研究——以科尔沁左翼中旗为例

A Study on Desertification Dynamics of Keerqin Sandy Land

以1995年和2000年的TM影像为信息源,划分土地利用类型并建立目视解译标志,利用GIS的图像、数据处理功能对沙漠化动态进行监测.结果表明研究区的沙漠化现象严重,各种沙漠化土地总面积37.4万hm2,占总土地面积的39.1%,植被盖度小于30%的较严重的沙漠化土地从1995年到2000年以61hm2/年的速度扩展,表明沙漠化有不断加剧的趋势.

Land-use types in Keerqin Sandy land areas were classified and visual interpretation remarks were established by taking TM images in 1995 and 2000 as information source.Then desertification dynamics is monitored with the help of images and data processing function of GIS.The results showed that desertification is more and more serious in this area.The total desertification area is 37.4×10~4 hm,accounted for 39.1% of total land areas.The more serious desertification areas where the vegetation cover is lower than 30% has been enlarging at the rate of 61.0 hm a year from 1995 to 2000.It indicated that the desertification in this area will be speeded up in future.