| 玛曲县天然草地沙化动态及现状分析 |
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| 引用本文： | 袁宏波,王辉,李晓兵,陈智平.玛曲县天然草地沙化动态及现状分析[J].甘肃农业大学学报,2006,41(1):73-78. |
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| 作者姓名： | 袁宏波 王辉 李晓兵 陈智平 |
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| 作者单位： | 甘肃农业大学林学院,甘肃,兰州,730070,甘肃省林业调查规划院,甘肃,兰州,730020 |
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| 基金项目： | 国家林业局荒漠化监测专题项目资助 |
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| 摘 要： | 通过对玛曲县2003年TM影像的解译判读,综合地形图、土地利用图以及前3期沙化监测资料,运用GIS技术,对2003年玛曲县草地沙化现状进行野外调查和遥感动态监测,并与前3期监测结果进行对比.结果表明:玛曲县的沙化范围逐步扩展,沙化所涉及的黄河沿岸长度已达186.12 km,占县境内黄河总长的43%;1990年到2003年间,沙化土地面积呈指数形式增加,沙漠化总面积已增加到7 136.77 hm2;极重度和重度沙化草地面积已占到区域沙化面积的41.4%,中度、轻度沙化草地面积分别为31.4%和27.2%,另外还有潜在沙化土地3 616.11 hm2,区域沙化程度整体已达重度水平.
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| 关 键 词： | 草地 沙化 动态监测 地理信息系统 |
| 文章编号： | 1003-4315（2006）01-0073-06 |
| 收稿时间： | 2005-09-17 |
| 修稿时间： | 2005-09-17 |
Analysis on desertification dynamics and present situation of the natural grassland in Maqu County |
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| YUAN Hong-bo,WANG Hui,LI Xiao-bing,CHEN Zhi-ping.Analysis on desertification dynamics and present situation of the natural grassland in Maqu County[J].Journal of Gansu Agricultural University,2006,41(1):73-78. |
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| Authors: | YUAN Hong-bo WANG Hui LI Xiao-bing CHEN Zhi-ping |
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| Institution: | 1. College of Forestry,Gansu Agricultural University,Lanzhou 730070; 2. Forestry Investigation and Planning Institute of Gansu Province,Lanzhou 730020,China |
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| Abstract: | Based on the data of TM images in 2003, topographic maps, land-use maps, and other information from earlier desertification monitoring, the present situation of natural grassland desertification in Maqu County of Gansu Province was investigated and contrasted with the monitoring data of the last three periods in 1990,1994,1999 by means of GIS technology. The results showed that the ranges of desertification has been extending gradually. The river bank with desertified land reached 186.12 km long,which occupied 43 % overall length of the Yellow River across the county. The area of desertified land increased as power exponent and the total area increased to 7 136.77 hm^2 from 1990 to 2003. The areas of desertified grassland in severe and very severe degree occupied 41.4 % of the total desertification area. The slight degree and moderate degree occupied 31.4 % and 27.2 % ,respectively. The general desertification degree of the county has reached severe level. |
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| Keywords: | grassland desertification dynamic investigation GIS |
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