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Monitoring the Cultivated Slope Land in the Three Gorges Reservoir Area Based on Remote Sensing and GIS

Wuhan University Journal of Natural sciences 2006年第4期11卷 915-921页

作者： zhou jieming1, zhou Qigang 2, {3.,{{3. zhiqin 2, {3. 4 1. The Faculty of Geography and Resources Science, sichuan Normal University, chengdu 610066, sichuan, china 2. institute of mountain {13. and environment, {1{3. academy of sciences, chengdu 610041, sichuan, china {3. Graduate University of the {1{3. academy of sciences, Beijing 100049, china 4. Information Center of Land and Resources Department of sichuan Province, chengdu 610041, sichuan, china The Faculty of Geography Resources Science Sichuan Normal University 610066 Chengdu Sichuan China institute of {1. hazards environment Chinese Academy of Sciences 610041 Chengdu Sichuan China Graduate University of the chinese {1. of sciences 100049 Beijing China Information Center of Land Resources Department of sichuan Province 610041 Chengdu Sichuan China

By means of combining auto-extraction with manual interpretation, the current distribution information about cultivated land is obtained. The distribution information of 1.92 is extracted from the dynamic polygons of 2002. The monitoring mini-system of the cultivated slope land is established. In the system, detailed surveys, focused on the resources of cultivated slope land, are carried out. The results indicate that the area of the cultivated slope land is very large. Meanwhile, there are lots of cultivated steep slopes with gradient above 3.°. The areas of steep land cultivated had been slowly reduced from 1.92 to 2002. At the same time, the pressures of returning farm land to forestry are great in all counties. The conflicts between population growth, insufficient grain supply and stagnant economic development sharpen increasingly. It is inevitable to improve the agricultural structure.

关键词： slope land cultivated remote sensing geography information system (GIS) the pressure of returning farm land to forestry Three Gorges Reservoir Area

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Land Use of the Three Gorges Reservoir Area and the Effect on Its Landscape Pattern in the Recent 50 Years

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Wuhan University Journal of Natural sciences 2006年第4期11卷 910-914页

作者： huang zhiqin 1,2,3., zhou wancun 1 ,{3.,{3., chinese academy of sciences , chengdu 610041, sichuan, china 2. Graduate University of chinese academy of sciences, Beijing 100049, china 3. sichuan {13. of Land Resource Management, chengdu 610041, sichuan , china 4. Department of Resources and environment Science, sichuan Normal University , chengdu 610061, sichuan, china 5. College of Information Engineering, chengdu University of Technology, chengdu 610059, sichuan, china institute of {1. hazards and {{3. Chinese Academy of Sciences Chengdu Sichuan China Graduate University of chinese {1. of sciences Beijing China sichuan {1. of Land Resource Management Chengdu Sichuan China Department of Resources and environment Science Sichuan Normal University Chengdu Sichuan China College of Information Engineering Chengdu University of Technology Chengdu Sichuan China

The paper makes detailed analysis on the changing processes of the main types of land use in Three Gorges Reservoir Area through the techniques of RS （Remote Sense） and GIS （Geography Information System）. Based on the theory of landscape ecology, many types of landscape pattern indexes are calculated and made correlation analysis. The results indicate that： in 1.95 the ecological environment of Three Gorges Reservoir Area was the most vulnerable in the recent 50 years, but resumed in 2002; the landscape pattern diversity index, fractal dimension index and fragmentation index has close correlation with the area of land use/cover change （LUCC）. The research also releases that the increase of the cultivated land, grassland and construction land deteriorates the landscape ecological pattern, while the increase of forest land area will help restore the landscape ecological pattern to its original state. The rapid change of grassland is an important index of the change of landscape pattern, because it has the most effect on change of landscape pattern index.

关键词： the Three Gorges Reservoir Area land use/cover change landscape pattern.

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