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Soil loss tolerance in calcareous soils of a semiarid region: evaluation, prediction, and influential parameters
Land Degradation & Development ( IF 4.7 ) Pub Date : 2020-03-06 , DOI: 10.1002/ldr.3597
Yaser Ostovari 1, 2 , Ali Akbar Moosavi 1 , Hamid Reza Pourghasemi 3
Affiliation  

Predicting soil loss tolerance (T‐value) as a first and crucial step in assessing soil erosion using pedotransfer functions (PTFs) could save time and cost. Therefore, this study aimed to evaluate T‐value and its influential parameters for calcareous soils of the Dorudzan Watershed, Fars Province, Iran, and to develop PTFs for its prediction using easily measureable soil properties. T‐value was determined in 60 soil profiles based on the soil thickness method. Various basic soil properties were used to develop five PTFs using stepwise multiple linear regression. T‐value varied from 3.5 to 22.5 with a mean value of 10.4 t ha−1 yr−1, which is approximately equal to the proposed value by US Department of Agriculture (11 t ha−1 yr−1). T‐value in Inceptisols located in the dam shore and agricultural lands was significantly higher than that of Entisols located in the forest and rangelands. Organic matter (OM) with a correlation coefficient of .77 with T‐value was the most influential variable in prediction of T‐value. The PTF 5, which used OM, soil aggregate stability, and permeability, with the highest R2 (0.72 and 0.79), the lowest mean error (−0.44 and 1.75 t ha−1 yr−1), the lowest root mean square error (2.98 and 2.75 t ha−1 yr−1) and the minimum Akaike information criterion (51.1 and 17.2) provided the best predictions for T‐value. However, when considering the acceptable indices and easier measureable soil properties (OM, soil erodibility, and pH) in PTF 3, we concluded that it was the best model to predict T‐value. Generally, the application of thickness method is recommended to determine T‐value in semiarid regions.

中文翻译:

半干旱地区石灰性土壤的土壤流失耐受性:评估,预测和影响参数

预测土壤流失耐受性(T值)是使用pedotransfer函数(PTF)评估土壤侵蚀的第一步也是至关重要的一步,可以节省时间和成本。因此,本研究旨在评估伊朗法尔斯省Dorudzan流域钙质土壤的T值及其影响参数,并利用易于测量的土壤特性开发用于预测的TTF。T值是根据土壤厚度方法在60个土壤剖面中确定的。使用逐步多元线性回归,将各种基本的土壤特性用于开发五个PTF。T值从3.5到22.5不等,平均值为10.4 t ha -1 yr -1,大约等于美国农业部的建议值(11 t ha -1 yr -1)。位于坝岸和农业用地上的恩蒂索尔的T值显着高于位于森林和牧场上的恩替索尔的T值。与T值相关系数为0.77的有机物(OM)是预测T值影响最大的变量。PTF 5使用OM,土壤团聚体稳定性和渗透性,具有最高的R 2(0.72和0.79),最低的平均误差(-0.44和1.75 t ha -1 yr -1),最低的均方根误差(2.98和2.75吨-1yr -1)和最小的Akaike信息标准(51.1和17.2)提供了T值的最佳预测。但是,考虑到PTF 3中可接受的指标和更容易测量的土壤性质(OM,土壤易蚀性和pH),我们得出结论,它是预测T值的最佳模型。通常,建议使用厚度法来确定半干旱地区的T值。
更新日期:2020-03-06
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