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首页> 外文期刊>The Kasetsart Journal >Prediction of Soil Loss in the Northern Part of Somali Region of Ethiopia Using Empirical Soil Erosion Models
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Prediction of Soil Loss in the Northern Part of Somali Region of Ethiopia Using Empirical Soil Erosion Models

机译：利用经验性土壤侵蚀模型预测埃塞俄比亚索马里北部地区的土壤流失

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摘要

Two empirical soil loss models, namely Universal Soil Loss Equation (USLE) and Soil Loss Estimation Model for Southern Africa (SLEMSA) were applied to assess extent of erosion hazard at 12 selected sites in the northern part of Somali region of Ethiopia. The amount of estimated soil loss for 10 out of 12 sites by using the USLE is by two to three and half times greater than that estimated by SLEMSA. The difference between the values of soil loss estimated by the two models can be attributed to the difference in the sensitivity of the models to their input factors. In general, since SLEMSA under estimate the amount of soil loss from a given site, it is recommended to use USLE to estimate soil loss in the northern part of the Somali region of Ethiopia. The sensitivity of both models to their 20% increase or decrease in one of their input variable at a time while keeping other variables constant was analysed. The analysis indicated that USLE was highly sensitive to slope gradient factor (S), soil conservation practice factor (P) and rainfall erosivity factor (R) but less sensitive to slope length (L) and vegetal cover factor (C). Whereas, SLEMSA was highly sensitive to change in rainfall kinetic energy (E) and soil erodibility (F) and was less sensitive to slope gradient (S), slope length (L) and percent cover factor (C).
机译：应用了两种经验性土壤流失模型，即通用土壤流失方程（USLE）和南部非洲土壤流失估计模型（SLEMSA），以评估埃塞俄比亚北部索马里地区12个选定地点的侵蚀危害程度。使用USLE估算的12个地点中有10个的土壤流失量是SLEMSA估算的土壤流失量的2到3倍半。两种模型估算的土壤流失值之间的差异可以归因于模型对输入因子的敏感性差异。通常，由于SLEMSA估计了给定地点的土壤流失量，因此建议使用USLE来估计埃塞俄比亚索马里地区北部的土壤流失。分析了两个模型在输入变量之一每次增加或减少20％的同时保持其他变量不变的敏感性。分析表明，USLE对坡度梯度因子（S），土壤保护实践因子（P）和降雨侵蚀力因子（R）高度敏感，但对坡长（L）和植物覆盖因子（C）较不敏感。而SLEMSA对降雨动能（E）和土壤易蚀性（F）的变化高度敏感，对坡度梯度（S），坡度长度（L）和覆盖系数（C）较不敏感。

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