川西北地区土壤侵蚀敏感性评价

川西北地区地处青藏高原东缘,是长江、黄河水系重要的水源涵养地,也是我国重要生态系统服务功能区。基于通用土壤流失方程(USLE),综合运用GIS和RS技术,根据川西北地区实际情况建立了土壤侵蚀敏感性评价指标体系,并分别选择降雨侵蚀力、土壤可蚀性、地形起伏度、沟壑密度和植被覆盖度5个因子,综合评价了川西北地区2000年与2015年土壤侵蚀敏感性等级情况。从两期评价结果来看,通过实施一系列生态保护与建设工程,研究区土壤侵蚀敏感性状况总体有所改善。研究成果可为该区域进一步规划与实施生态工程提供借鉴。

Evaluation on soil erosion susceptibility in northwest Sichuan region

Northwest Sichuan region is situated at the eastern margin of the Qinghai-Tibet Plateau, which is a major water conserving area for Yangtze River and Yellow River. It is also an important area that features ecosystem service function in China. Using Universal Soil Loss Equation (USLE) and employing GIS and RS technology, a soil erosion susceptibility evaluation index system was established based on the practical situation of the region. Comprehensive evaluation was conducted on degrees of soil erosion in the region in 2000 and 2015 by selecting and analyzing five influencing factors, which are rainfall erosivity, soil erodibility, terrain relief, gully density and vegetation coverage. The results show that the soil erosion susceptibility of the region is improved by implementing a series of ecosystem protection and construction projects. The research results can be a reference for the further planning and implementing ecological engineering in the region.