Abstract
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.
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Foundation item: Supported by the State Council Three Gorges Project Construction Comnittee Office (SX [2002] 004)
Biography: ZHOU Jieming (1956-), male, Professor, research direction: land use research
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Jieming, Z., Qigang, Z. & Zhiqin, H. Monitoring the cultivated slope land in the Three Gorges Reservoir Area based on remote sensing and GIS. Wuhan Univ. J. Nat. Sci. 11, 915–921 (2006). https://doi.org/10.1007/BF02830188
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DOI: https://doi.org/10.1007/BF02830188
Key words
- slope land cultivated
- remote sensing
- geography information system (GIS)
- the pressure of returning farm land to forestry
- Three Gorges Reservoir Area