GIS-Based Assessment On Region Soil Erosion Sensitivity Soil Erosion Sensitivity

This paper take Hancheng as study area, which located at the ecotone between the Weihe River plain water erosion area and the Loess Plateau gully erosion zone. In Geographical information system (GIS) software's support, according to the general soil erosion equation (USLE), has appraised the soil erosion sensitivity in Hancheng, and analyzes its sensitive rank in the geography space distributed condition, simultaneously has also analyzed the potential soil erosion sensitivity in Hancheng. In the basin regionalization's foundation, appraises various basins soil erosion sensitivity. May provides the beneficial reference of Prevention and government for soil erosion in Hancheng and provide the scientific basis for environment improvement in the entire ecotone between the Weihe River plain water erosion area and the Loess Plateau gully erosion zone, through this paper research.First, through to various soil erosion sensitive influence factor computation analysis, obtain the single-factor spatial distribution of soil erosion sensitivity; Then assignment for overlay operations for the sensitivity level of the single-factor, obtains distribution of various grades of sensitivity to soil and water loss in Hancheng. Simultaneously, in did not consider that the surface cover factor, calculate the sensitivity spatial distribution of the potential soil erosion sensitivity; Finally, through the hydrology analysis tool of ArcGIS, divided into four small basin of the study, according to the soil erosion sensitive value's computational method of Hancheng, obtain the various basins soil erosion sensitive value, and appraise various basins soil erosion's sensitivity.After the operation analysis, rainfall erosivity and soil erodibility are generally high level of single-factor sensitivity in Hancheng, more moderate level of sensitivity account for 60.3% of total area,78.46%; Terrain and land cover single factor sensitivity level single factor of soil erodibility generally lower sensitivity level, below moderate level account for the research area total area separately 65.88%,63.63%. On this basis, soil sensitivity by light-sensitive and insensitive level primarily, accounts for the research area separately 52.76%,45.81%. The sensitivity level of central shallow mountain area is higher than the mountain valley in northwest and eastern valley area, this is similar the potential soil erosion sensitivity level's spatial distribution. But the distribution area of above moderate sensitive level is enhanced of potential soil erosion of sensitivity in Hancheng, specially the moderate sensitive level's dispersal area increases 340.93km2. Moreover, the spatial distribution characteristic of various basins soil erosion sensitivity also presents as a whole with the soil erosion sensitivity similar of Hancheng.This paper evaluate the sensitivity of the regional soil erosion through the GIS technology, it can be more convenient, real-time extraction of the sensitivity factor, improves the timeliness and scientific of soil erosion sensitivity evaluation.