干旱区研究2011，Vol.28Issue(4)：572-579,8.
2003-2008年甘肃民勤绿洲土地荒漠化动态监测
Monitoring of Dynamic Change of Land Desertification in the Minqin Oasis during the Period of 2003-2008
摘要
Abstract
On the basis of TM image interpretation,this study was to monitor the dynamic change of land desertification with an area of 8 355.20 km2 in Minin Oasis and its peripheral areas during the period from 2003 to 2008.The results show that land desertification was serious and its area accounted for more than 80% of the monitored area.The desertification land in Minqin Oasis was divided into two types,i.e.the wind-eroded desertification and salinized desertification,and it was distributed in the oasis and its peripheral areas in a zonal way.In 2003,the total area of land desertification in the monitoring area was 671 333.08 hm2.and accounted for 80.35% of the total area;in 2008,it was reduced to 670 396.13 hm2.and accounted for 80.24% of the total.During the period from 2003 to 2008,the area of land desertification was reduced by 936.95 hm2.and occupied 0.11% of the total in the monitoring area,in which the areas of wind-eroded desertification land and salinized desertification land were 0.49 hm2.and 936.45 hm2.respectively.Viewing from the desertification degree,the areas of serious desertification land and slight desertification land were reduced by 4 347.15 hm2.and 172.00 hm2.respectively,but the area of moderate desertification land was enlarged by 3 582.21 hm2.The reduced desertification land was mainly distributed in the oasis and its peripheral zonal regions of 0-2 km and 4-6 km in width,in which the area of reduced desertification land was the largest in the peripheral zonal region of 0-2 km,then in the oasis,and it was the smallest in the peripheral zonal region of 4-6 km;the enlarged desertification land was mainly distributed in the peripheral zonal region of 2-4 km and 6-20 km in width,and the enlarged extent was small.The desertification index of the Minqin Oasis was 2.256 5 in 2003 and 2.249 3 in 2008 respectively,it was between the moderate index and the serious one,and it was slightly decreased.Therefore,the development of land desertification was holistically kept within limits.关键词
土地荒漠化/评价/荒漠化类型/动态监测/绿洲/民勤Key words
land desertification/evaluate/desertification types/monitoring of dynamic change/Minqin/Oasis分类
农业科技引用本文复制引用
魏怀东,周兰萍,徐先英,李亚,丁峰,常兆丰,杨自辉..2003-2008年甘肃民勤绿洲土地荒漠化动态监测[J].干旱区研究,2011,28(4):572-579,8.基金项目
国家软科学研究计划项目内陆河流域水资源利用与区域协调发展(2007GXQ4D190) （2007GXQ4D190）
