| 基于RS和GIS的沙漠-黄土过渡带土地沙漠化分布与变化研究——以陕北榆林地区为例 |
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| 关键词:desertification desert-loess transitional zones RS and GIS |
| 基金项目:中国地质调查局项目(200112300004) |
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| A Dynamic Study of Land Desertification in Desert-Loess Transitional Zones Based on RS and GIS:A Case Study of Yulin Area |
| In this paper the land desertification of desert loess transitional zones in Yulin area is studied from TM images in a geographical system (GIS). It is found that the desertification in Yulin remains rather severe. The desertified land accounts for 67.7 percent of the total land area. The distribution of desertified land shows obvious spatial imbalance, with severe desertification in northwestern regions and weak desertification in southeastern regions. This imbalance is attributed to the differences in physical factors and land-use patterns. The process of desertification in Yulin area tended to become stable between 1987 and 1999 as a result of positive efforts. In the end the cause of desertification is discussed. It is believed that the interaction and contradiction between the natural process and the human activity may lead to the development of desertification. |
| ZHANG Li,WANG Fei-yue,YUE Le-ping,LI Zhi-pei,WANG Min,NIE Hao-gang.2004.A Dynamic Study of Land Desertification in Desert-Loess Transitional Zones Based on RS and GIS:A Case Study of Yulin Area[J].Acta Geoscientica Sinica,25(1):63-66. |
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