甘肃省沙化土地监测研究

1999年度甘肃省沙化土地监测是以1994～1996年沙漠化土地普查为本底,用两期卫星TM影像(1994,1998)对比分析,进行了沙化土地动态监测。采用处理和分析信息结合的遥感综合监测与计算机信息管理的技术体系,结合地面监测及典型解剖调查,得出甘肃省沙化土地数据和动态演变趋势。结果表明:全省重点县沙化土地类型动态变化总体呈扩展趋势,同时沙化土地逆转变化也比较明显。表现在固定沙地、戈壁、风蚀残丘、潜在沙化土地增加,流动沙地、半固定沙地、闯田、非生物工程治沙地减少。各县市沙化土地类型发展与逆转并存。

Study on the monitering of sanded land in Gansu

Land sandification moritoring of Gansu province in 1999 was based on general investigation of desertification between 1994 and 1996 and TM images in 1994 and 1998. sandification datus and dynamic developing trend of Gansu were concluded by the method that synthesized supervision of remote sensing, technology system of computer information management and ground supervision technique were applied. The results showed that: in general, dynamic changes of land type of sandification in the key counties were expanding, simultaneously, reversing trend of sandification was obvious. The area of fixed sand land, Gobi and windy land was increasing, while drifting-land, semi-fixed land and non-biological projects were decreasingical.