【摘要】 应用1987年和2000年两期遥感数据,通过解译分析了解到古浪全县土地利用变化趋势是腾格里沙漠南缘的大面积土质戈壁、固定沙地因为调水工程的实施而被开垦为水浇地,南部山区和中部川旱地区大面积的山旱地、川旱地退耕还草,导致全县的耕地面积减少了45312.476hm2。全县荒漠化类型有风蚀、水蚀和沙化3种类型,荒漠化土地总面积减少了8910.84hm2,荒漠化指数S从1987年的2.209降低到了2.162,生态建设区荒漠化指数减少了0.118。在其所辖的25个行政区内,15个乡镇荒漠化指数降低,2个降低幅度超过了0.5,1个降到了1以下;10个乡镇荒漠化指数有不同程度升高,1个行政区超过了3,荒漠化局部得到了逆转,同时在无行政管理的腾格里沙漠公地等行政区荒漠化程度又有所加重。更多还原

【Abstract】 By interpreting the RS images of 1998 and 2000, this paper concluded the tendency of landuse in Gulang County which was that Gobi and sand were reclaimed into irrigated field in the south ridge of Tengeli Desert, hill dry and plain dry land were returned to grassland from farmland in the south mountain and plain dry area, and these changes caused the decrease of farmland area of 45 312.476 hm~2. The desertification type was classified into deflation, water erosion and sandy desertification. The area of desertified land decreased by 8 910.84 hm~2, and desertification index S decreased from 2.209 in 1987 to 2.162 in 2000 and 0.118 in the ecologically building zones. In the 25 districts of Gulang County, the desertification index of 15 small towns decreased; that of 10 small towns increased, and the state of desertification reversed locally. Meanwhile, the degree of desertification was aggravated in the districts that were not administered.更多还原