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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 ,huang zhiqin 2, 3, 4.1. the faculty of geography and resources science, sichuan normal university, chengdu 610066, sichuan, china 2. Institute of Mountain Hazards and Environment, Chinese Academy of sciences, chengdu 610041, sichuan, china 3. Graduate university of the Chinese 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 and resources science Sichuan Normal University Chengdu Sichuan China Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu Sichuan China Graduate university of the Chinese Academy of sciences Beijing China Information Center of Land and resources Department of sichuan Province 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 1992 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 35°. The areas of steep land cultivated had been slowly reduced from 1992 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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