民勤县土地荒漠化遥感分析

民勤绿洲在河西走廊乃至全国具有重要的生态地位.运用遥感解译的方式对民勤自20世纪90年代至本世纪土地荒漠化进行分析,探讨造成这种结果的原因.结果表明：民勤绿洲的恢复速度赶不上沙漠的扩张速度,而且水体的减少和持续的大规模开发地下水使得绿洲的生存面临更大的威胁;民勤土地荒漠化发生发展是多种因素综合作用的结果,人口的急剧增加和人类活动的加剧是主要原因,而风的变化也起着主要作用,所以治沙首先要改变当地的种植结构,其次要治风;在民勤408 km的风沙线上有66个风沙口,如何解决此问题是解决民勤土地荒漠化的根本.

The remote sensing analysis of land desertification dynamic changes in Minqin

Minqin oasis has an important ecological position in hexi corridor and even the whole country. Remote sensing interpretation was used to study the desertification of land dynamic change characteristics from 1990s to the beginning of this century, and its causes were analyzed. The results indicate; the speed of desert expansion is faster than of oasis recovering speed, and water reduction and sustained large-scale exploitation of groundwater makes oasis faces a greater threat to survival; the development of land desertification in Minqin is the result of many factors, the wind play a major role, so first to rule the wind; there are 66 sandstorm mouths along the 408km sandstorm line in Minqin, how to solve this problem is the fundamental to solve desertification in Minqin.