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Estimation of Vegetation Coverage and Analys is of Soil Erosio Using Remote Sensing Data for Guishuihe Drainage Basin |
TAN Bingxiang1, LI Zengyuan1, WANG Yanhui2,YU Pengtao2, LIU Libing3 |
(1. Inst of Forest Resources Information Technique, Chinese Academy of Forestry , Beijing 100091, China;2. Research Inst of Forest Ecology , Environment & Protection, Chinese Academy of Forestry ,Beijing 100091, China; 3. The Water Resources Administration of Yanqing County , Beijing 102100, China) |
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Abstract Vegetation coverage plays an important role in decreasing soil loss, protecting environment and improving the standard of living. Therefore. it is very necessary to dynamically estimate the soil erosion in large area for guiding the environment protection activities. As the main information resources, remote sensing data can be applied widely for soil erosion estimation. In this paper, the main study focus on the methods of extracting vegetation coverage and estimating soil erosion by using remote sensing data,combining with other investigation information, for Guishuihe Drainage Basin, Yanqing county, Beijing.Firstly, the land-use map and vegetation coverage map of this basin were obtained using TM image and vegetation index model. Secondly, slope map was created from DEM. Thirdly, based on the soil erosion intensity classification, soil erosion intensity map was obtained by overlaying the maps of land-use,vegetation coverage and slope. Finally, soil erosion modulus in this basin was calculated according to the erosion area and intensity. The soil erosion and its spatial distribution were quantitatively analyzed. The result shows that the soil erosion in Guishuihe Drainage Basin is mainly in the very slight and slight degree, the area percentage of these 2 erosion intensities occupies 74.88%; while the erosion of strong and very strong degree are very limited, with an area percentage of less than 2%. The soil erosion modulus for whole basin was estimated as 1 746.1 t/km2·a.
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Received: 12 July 2004
Published: 14 November 2011
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