2003-2008年甘肃民勤绿洲土地荒漠化动态监测

干旱区研究 ›› 2011, Vol. 28 ›› Issue (4): 572-579.

2003-2008年甘肃民勤绿洲土地荒漠化动态监测

魏怀东, 周兰萍, 徐先英, 李亚, 丁峰, 常兆丰, 杨自辉

甘肃省荒漠化防治重点实验室甘肃民勤荒漠草地生态系统国家野外科学观测研究站甘肃省治沙研究所, 甘肃兰州 730070

收稿日期:2010-10-15 修回日期:2010-11-15 出版日期:2011-08-25 发布日期:2011-09-06
作者简介:魏怀东(1972-),男,甘肃景泰人,副研究员,主要从事荒漠化监测与治理工作.E-mail:weihdgs@126.com
基金资助:
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)

Monitoring of Dynamic Change of Land Desertification in the Minqin Oasis during the Period of 2003-2008

WEI Huai-dong, ZHOU Lan-ping, XU Xian-ying, LI Ya, DING Feng, CHANG Zhao-feng, YANG Zi-hui

Gansu Key Laboratory of Desertification Combating, Minqin National Station for Desert Steppe Ecosystem Research, Gansu Institute of Desertification Combating Research, Lanzhou 733070, China

Received:2010-10-15 Revised:2010-11-15 Published:2011-08-25 Online:2011-09-06

摘要/Abstract

摘要： 通过对2003年和2008年2期覆盖民勤的TM影像解译,对民勤绿洲及其外围20 km范围内8 355.20 km²土地进行荒漠化动态监测。结果表明:民勤绿洲土地荒漠化严重,荒漠化土地占到监测区的80%以上。荒漠化类型分为风蚀和盐渍荒漠化2种,呈带状分布在绿洲外围或镶嵌于绿洲内部。2003年监测区内共有荒漠化土地 671 333.08 hm²,占监测区总面积的80.35%;2008年监测区内共有荒漠化土地670 396.13 hm²,占监测区总面积的 80.24%。5年间荒漠化土地面积减少了936.95 hm²,占监测区总面积的0.11%,其中风蚀荒漠化土地减少了0.49 hm²,盐渍荒漠化土地减少了936.45 hm²。从荒漠化程度看,重度荒漠化土地减少了4 347.15 hm²,中度荒漠化土地增加了3 582.21 hm²,轻度荒漠化土地减少了172.00 hm²。减少面积主要分布在绿洲、绿洲外围0～2 km和4～6 km范围内,其中绿洲外围0～2 km范围内减少幅度最大,其次是绿洲,绿洲外围4～6 km范围内减幅最小;增加面积主要分布在绿洲外围2～4 km和6～20 km范围内,且增幅较小。2003年和2008年民勤的荒漠化指数分别为 2.256 5和2.249 3,荒漠化指数处于中度和重度之间,且偏向中度,荒漠化指数略有下降,整体的荒漠化发展得到了初步遏制。

关键词: 土地荒漠化, 评价, 荒漠化类型, 动态监测, 绿洲, 民勤

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.

Key words: land desertification, evaluate, desertification types, monitoring of dynamic change, Minqin, Oasis

中图分类号:

S157.1

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.

WEI Huai-dong, ZHOU Lan-ping, XU Xian-ying, LI Ya, DING Feng, CHANG Zhao-feng, YANG Zi-hui. Monitoring of Dynamic Change of Land Desertification in the Minqin Oasis during the Period of 2003-2008[J]. , 2011, 28(4): 572-579.

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