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为探讨黄土高原地区土壤侵蚀危险度,本文以甘肃省定西市安定区为研究对象。借助GIS的空间分析功能,运用通用土壤侵蚀方程(USLE),计算出土壤侵蚀量、编制出土层厚度图和土壤容重图,预测出该地区土壤的抗蚀年限。按水利部颁布的标准,将安定区土壤侵蚀潜在危险度分为无险型、轻险型、危险型、极险型、毁坏型5个级别。通过分析不同土地利用类型、不同坡度、不同坡向、不同侵蚀强度背景条件下的土壤侵蚀潜在危险度状况,探讨其空间分布特点,为水土保持规划治理提供科学依据。
In order to explore the risk of soil erosion in the Loess Plateau, this article takes Anding District, Dingxi City, Gansu Province as the research object. With the help of spatial analysis function of GIS, the general soil erosion equation (USLE) was used to calculate the amount of soil erosion, and the soil thickness map and soil bulk density map were prepared to predict the soil erosion duration in this region. According to the standards promulgated by the Ministry of Water Resources, the potential risk of soil erosion in the stability zone is divided into five levels: no risk type, light risk type, dangerous type, extreme danger type and destruction type. By analyzing the potential risk of soil erosion under different land use types, different slope, different aspect and different erosion intensity background conditions, the spatial distribution characteristics of soil erosion were discussed to provide a scientific basis for soil and water conservation planning and management.