四川德阳地区土壤侵蚀因子与敏感性分析

德阳市地处长江上游生态屏障的最前沿,水土流失不但与本市防汛安全和未来的经济、生态、社会发展密切相关,而且极大地影响着长江中下游各地的可持续发展和相关的重大工程建设.以通用土壤流失方程(USLE)为基础,选择降雨侵蚀力、地形起伏度、土壤质地和植被覆盖等自然因子作为水土流失敏感性的评价指标,根据德阳地区自然环境特征制定评价指标的分级标准,在GIS和RS技术支持下,通过多因子叠加计算得到德阳地区土壤侵蚀敏感性评价的结果,指出了德阳地区极敏感区、高度敏感区、中度敏感区、轻度敏感区和一般敏感区等不同土壤侵蚀敏感区的空间分布,提出了有效控制该地区土壤侵蚀的建议.

Factors and Sensitivity Analysis of Soil Erosion in Deyang Sichuan Province

Deyang City lies in the best front of Ecological Protective Screen of the upper reaches of the Yangtze River,water and soil loss not only relates closely to Deyang city's flood control security and future economy,ecologyc,social development,but also affects seriously sustainable development and relative significant engineer construction of the middle and upper reaches of the Yangtze River.Based on USLE,the authors used the rainfall erosion force,topographic relief,soil texture,percentage of forestry area and so on as the evaluation index of water and soil loss sensitivity.According to features of natural environment of Deyang area,grade scales of evaluation index are developed.By right of GIS and RS techniques,calculating the results of erosion sensitivity evaluation of Deyang area through multiple factors superposition.It not only indicates the spatial distribution in Deyang area: extremely sensitive area,highly sensitive area,moderate sensitive area,lightly sensitive area;generally sensitive area,but also proposes to control effectively soil erosion.