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| Evolvement of gully erosion in village scale in the typical black soil area |
| Li hao1,2, Zhang Xingyi1, Liu Shuang1,2, Yury Kravchenko3, Kateryna Ivanova3, Li Xufeng1, Chen Qiang1, 2 |
| 1. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 150081, Harbin; 2. Graduate University of Chinese Academy of Sciences, 100049, Beijing: China； 3. National University of Life and Environment Sciences of Sciences of Ukraine, 03041, Kyiv, Ukraine |
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Abstract The aggravation of gully erosion represents the severity of water and soil loss in the typical black soil area in northeast China. Slope steepness and tillage are important natural and artificial factors that affect the evolution of gully erosion, respectively. Applying high spatial resolution remote sensing data is a useful method in the identification of the distribution and evolution of erosion gully. The distribution and density of erosion gully, ridge direction as well as land use of the village-scale in the year 1968 and 2009 were collected from two submeter remote sensing images by GIS and RS technologies, and the topographical data of corresponding areas such as contour, slope steepness, slope length and slope steepness along direction of ridge were extracted from the 1∶10000 relief map. The dynamic of erosion gully and its driving factors during the passed 41 years were analyzed by Arcgis spatial analysis function. The results showed: 1) the density of erosion gully markedly increased during the past 41 years. The density of erosion gully from remote sensing interpretation by submeter resolution was much higher than that on previous lower resolution remote sensing data; 2) The largest variation area of erosion gully density was found in the region of slope steepness between 0.25°and 1.5°, while the density of erosion gully decreased in the area of slope steepness more than 8°due to reforestation; 3) The highest density of erosion gully was found in the zone of slope length between 300m and 500m of the slope; 4) During the recent 41 years, the cultivated area increased in the region of gradient along the ridge between 0 and 0.25° after ridge direction was changed, whereas it decreased in the region of slope steepness larger than 0.25°.
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Received: 11 November 2011
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