Evaluation of soil loss tolerance and of erosion risk is vital to sustain agricultural productivity and to manage natural resources. In the present study, we attempted to evaluate soil erosion risk of the Dorudzan watershed in Southwest Iran by using the RUSLE model coupled with RS-GIS. The soil erosion risk was compared with the measured soil loss tolerance (T value). To derive the RUSLE factors, we used a digital elevation map with a 10-m resolution, a 10-year rainfall data set, and a digital land use map with soil data obtained from 60 profiles plus Landsat-8 images. The thickness method was employed for determining the T value. The results revealed that the average of the T value was 10.4 t ha⁻¹year⁻¹, ranging from 3.5 to 22.5 t ha⁻¹ year⁻¹. The T value in Inceptisols with significantly deeper soils and a higher SOM percentage was noticeably higher than that of in Entisols. Regarding the T value, the SOM and permeability with correlation coefficients of 0.77 and 0.59, respectively, were the best-correlated properties. The annual soil loss (24.6 t ha⁻¹ year⁻¹), varying from zero in the flat areas up to 153.5 t ha⁻¹ year⁻¹ in the hilly areas, was more than twice the T value. Erosion classes of very high, severe, and very severe cover 25.07% (6983.2 ha) of the site. The LS factor has been identified as the most influential linked to soil erosion.

评价土壤流失耐受性和侵蚀风险对于维持农业生产力和管理自然资源至关重要。在本研究中，我们试图通过使用RUSLE模型和RS-GIS评估伊朗西南部Dorudzan流域的土壤侵蚀风险。将土壤侵蚀风险与测得的土壤流失耐受性（T值）进行了比较。为了得出RUSLE因子，我们使用了分辨率为10 m的数字高程图，10年的降雨数据集，以及数字土地使用图，其中包含了从60个剖面和Landsat-8图像获得的土壤数据。厚度法用于确定T值。结果表明，T值的平均值为10.4 t ha - ¹年^-1，范围从3.5到22.5 t ha ^-1 year ^-1。土壤深得多，SOM百分比高的Inceptisols中的T值显着高于Entisols中的T值。关于T值，相关系数分别为0.77和0.59的SOM和磁导率是最佳相关特性。每年的土壤流失（24.6 t ha - ¹年^-1）从平坦地区的零变化到丘陵地区的153.5 t ha - ¹年^-1的变化，是T的两倍以上值。侵蚀级别非常高，严重和非常严重，覆盖了该地点的25.07％（6983.2公顷）。LS因子已被确定为与土壤侵蚀最相关的因素。