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| Dynamic changes of soil erosion in Three Georges Reservoir Area of Chongqing |
| Chen Guojian,Wu Detao,Wang Caixia,Wang Caijun,Li Yangbing |
| 1.School of Geographical Sciences,Chongqing Normal University;2.Key Laboratory of GIS Application of Chongqing:400047,Chongqing,China |
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Abstract This paper figures out Markov Transferred Rates Matrix of soil erosion in Three Gorges Reservoir Area of Chongqing and studies the translated relations between the different soil erosion intensities by overlapping the satellite images of soil erosion in 1995 and 2004 with GIS techniques,which discovered the characteristics of temporal-spatial change of soil erosion in Three Gorges Reservoir Area of Chongqing in past ten years.The results indicate the soil erosion intensities in Three Gorges Reservoir Area of Chongqing are very high because that the areas of moderate soil erosion and higher than 70.84 percent of the area of soil erosion in Three Gorges Reservoir Area of Chongqing and annual soil erosion modulus is 3 766 t/(km2·a) which is higher than that in Guizhou Province and Hubei Province;The area of soil erosion in Three Gorges Reservoir Area of Chongqing is 51.71 percent of the area of territory in Three Gorges Reservoir Area of Chongqing in 2004,this percentage is higher than the level of 37 percent of China and the level of 31.2 percent of Yangtze River basin,and much higher than that of neighboring Sichuan Province and Guizhou Province and Hubei Province.Between 1995 and 2004,the area of soil erosion in Three Gorges Reservoir Area of Chongqing reduced 22 percents and soil erosion intensities obviously descended,among which the area of moderate soil erosion is largest in soil erosion intensities and second in utmost soil erosion and intensity soil erosion.The improved degrees of soil erosion are positive correlation to soil erosion intensities in Three Gorges Reservoir Area of Chongqing.In overall terms,the soil erosion in Three Gorges Reservoir Area of Chongqing is basically under controlling and it ensured its ecological environment to evolve towards the sound development.
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Received: 02 December 2008
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