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在ARCGIS 9.3地理信息系统支持下,实现了土壤侵蚀潜在危险度的分级及其空间分析。以青藏高原东北部的共和盆地塔拉滩草原为研究对象,首先采用地球化学放射性同位素-137Cs侵蚀模型估算土壤侵蚀量,再由土壤年均侵蚀量、土层厚度和土壤容重得到抗蚀年限图。参照水利部标准将土壤侵蚀潜在危险度分为5级,同时分析了不同坡度和不同土地利用类型上的土壤侵蚀潜在危险度。研究表明:共和盆地塔拉滩的土壤侵蚀潜在危险度以轻险型为主,从土壤侵蚀潜在危险指数(SEPDI)来看,属于轻度危险区域。
With ARCGIS 9.3 geographic information system support, the classification of potential risk of soil erosion and its spatial analysis are realized. Taking Talatan grassland in the Republican Basin in the northeastern Qinghai-Tibet Plateau as the research object, the soil erosion amount was first estimated by using the geochemical radioactive isotope-137Cs erosion model, then the annual erosion resistance, the soil thickness and the bulk density of the soil were obtained. . According to the standards of Ministry of Water Resources, the potential risk of soil erosion is divided into five levels, and the potential risk of soil erosion on different slope and different land use types is analyzed. The results show that the potential risk of soil erosion in Tara Beach in the Republican Basin is mainly of low-risk type. According to the potential hazard index of soil erosion (SEPDI), it belongs to the slightly dangerous area.