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Position: Home > Articles > Application of remote sensing in study of slope land use and soil erosion in subtropic region of China. Pedosphere 1997,7 (3)

Application of remote sensing in study of slope land use and soil erosion in subtropic region of China.

作  者：
Zeng ZhiYuan;Pan XianZhang;Zeng ZY;Pan XZ
单  位：
;Institute of Soil Science, Academia Sinica, P.O. Box 821, Nanjing 210008, China.
关键词：
land use;remote sensing;thematic mapper;multispectral imagery;erosion slopes sloping land;china guangxi
摘  要：
Two remote sensing case studies are described on land use in the subtropical region of China. The first was on slope land use in the Yangtze River Three Gorges area (60 497 km2). Geometric correction and supervised classification were conducted forten scenes of Landsat-5 thematic mapper (TM) or multiple spectral scanner (MSS) images. The resolution of the processed images was 50 X 50 m on the ground. From the classification, land use/cover categories in this area were discriminated. Then the croplands, including rice fields and upland fields, were extracted from the land use/cover maps. Simultaneously, the slope grade maps were prepared based on the topographic maps. Overlaying the slope grade maps and the cropland maps, the area and percentage of the croplands in different slope grades were determined. This case study showed that 71.5% of the uplands had slopes of >15deg and 25% had slopes >25deg, on which urgent engineering works should be undertaken to prevent/reduce erosion. The second case study was on soil erosion in Linshan County of Guangxi Province. Aerial photograph interpretation and supervised classification of a Landsat TM image were carried out to discriminating land cover/use categories in an area of 3557.8 km2. Soil erosion intensity grades were determined according to the land cover/use maps and slope maps. It was shown that land suffering soil erosion accounted for 2404.0 km2 (67.6%) of the total area of the county. Necessary measures to control soil erosion are needed across this area.

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