The challenges of measuring and estimating the soil erodibility factor (K) of the (R)USLE model in rangelands of arid regions

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Avizhgan Ayoub; Asadi Hossein; Arabkhedri Mahmood; Noor Hamzeh; Nazari Samani Ali Akbar

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Journal Paper

Paper Information

Journal: IRANIAN JOURNAL OF SOIL AND WATER RESEARCH Year:2025 | Volume:56 | Issue:2 Page(s): 351-371

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Title

The challenges of measuring and estimating the soil erodibility factor (K) of the (R)USLE model in rangelands of arid regions

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Keywords

Erosion modelling

Plot length

rainfall intensity

Soil loss

Abstract

This research aimed to determine the soil erodibility factor (K) of the Universal Soil Loss Equation (USLE) by direct measurement of soil loss at natural runoff plots (), and to compare it with the estimated K by the USLE-nomograph (). The research carried out at the Sanganeh Soil Conservation Research Site located in the northeast of Iran, in dry rangelands. The soil loss data were obtained from 19 plots with lengths of 20 and 25 m, and different conditions in terms of soil, slope, vegetation cover, and rock fragments under 20 natural rainfall events. The results showed that average intensity and the maximum 30-minute intensity had a greater correlation with soil loss compared to the. Based on the results obtained, is at least 24, 7, and 6 times of, obtained using the soil loss data of the long-term average, the year with the largest share, and the most intense event (), respectively. The main reasons likely for this overestimation are the low intensity of erosive events and the resulting uncertainties in the measurement of soil loss and other USLE model factors in dry rangelands. Therefore, based on the overestimation of the USLE nomograph, more research, especially with a longer statistical period or using a rainfall simulator with an intensity of 63 mm h-1 in field, is needed to develop appropriate relationships to estimate the K factor in rangelands in dry regions.

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