塔里木河下游土地利用动态变化分析

Analysis of the Land Use/Cover Dynamic Degree at the Lower Reaches of Tarim River

利用1990年，1999年TM影像及2002年CBERS影像的4、3、2（RGB）波段合成影像解译结果，运用分类结果比较法求得研究区土地利用／覆盖变化转移矩阵，结合塔里木河下游土地利用／覆盖动态指数进行分析。结果表明．1990-1999年塔里木河下游大部分土地利用／覆盖动态变化处于一种动态均衡状态,只有耕地、其他林地、湖泊、水库坑塘、农村居民地处于非均衡或极不均衡状态。转入面积远大于转出面积。1999-2002年只有其他林地、河渠处于非均衡状态。从总体分析．塔里木河下游自然植被面积持续减少，沙漠化面积继续增加，生态环境日趋恶化。

Based on remote sensing imagine in 1990, 1999 and 2002, taking Landsat 5 TM （thematic mapper） images and CBERS of band 4,3 and 2 as the data sources. The classification result comparative method is applied and the land use / cover change matrix is obtained with the index of the land use/cover dynamic degree at the lower reaches of Tarim River to analyse. Result shows,in 1990- 1999, the most land use/cover dynamic degree to be in dynamic equalization condition, only infield, woodland,lakes,countryside inhabitant is in the non-equalization condition. 1999- 2002,only woodland, the rivers and canals are in the non-equalization condition. In the general,the natural vegetation area of the lower reaches of Tarim River continues decrease,the desertifieation area goes on increasing,the ecological environment deteriorates gradually.