Preprints
https://doi.org/10.5194/nhess-2018-310
https://doi.org/10.5194/nhess-2018-310
30 Oct 2018
 | 30 Oct 2018
Status: this preprint was under review for the journal NHESS but the revision was not accepted.

Estimation of soil erosion considering soil loss tolerance in karst area

Yue Cao, Shijie Wang, Xiaoyong Bai, Huiwen Li, Cheng Zeng, Yichao Tian, Fei Chen, Luhua Wu, and Mingming Wang

Abstract. The prediction of soil erosion is critical to regional ecological assessment and sustainable development. However, due to the geological background of the karst area, the soil holding capacity is very limited, so it is necessary to consider the allowable loss of soil. Here we took thermodynamic dissolution model of carbonate rocks and the lithological characteristics to estimate soil loss tolerance, and corrected and quantitatively evaluated the soil erosion. Major findings are as follows: (1) The soil loss tolerance of homogenous carbonate rocks is 31.10 t · ha · yr−1, carbonate rock intercalated with clastic rocks is 120.81 t · ha · yr−1, carbonate/clastic rock alternations is 282.55 t · h · yr−1, and clastic rock is 500 t · ha · yr−1. (2) After the correction of the soil loss tolerance, the average annual amount of soil loss in the study area is 3.08 t · ha · yr−1, which is 41.12 % of the model. The predicted value of soil erosion is nearly the same as the observed value after modification. (3) It is necessary to reconsider the risk assessment model of soil erosion applicable to karst areas. This paper proposes an idea to estimate soil erosion based on the allowable loss of soil, which is more scientifically and accurately to reflect the soil erosion status of the study area compared with the traditional way. This study provides a corresponding reference for the formulation of soil and water conservation policies in China and the world's karst regions.

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Yue Cao, Shijie Wang, Xiaoyong Bai, Huiwen Li, Cheng Zeng, Yichao Tian, Fei Chen, Luhua Wu, and Mingming Wang
 
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Yue Cao, Shijie Wang, Xiaoyong Bai, Huiwen Li, Cheng Zeng, Yichao Tian, Fei Chen, Luhua Wu, and Mingming Wang
Yue Cao, Shijie Wang, Xiaoyong Bai, Huiwen Li, Cheng Zeng, Yichao Tian, Fei Chen, Luhua Wu, and Mingming Wang

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Latest update: 13 Jun 2024
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Short summary
Due to the soil holding capacity is very limited in karst area, it is necessary to consider the allowable loss of soil. Here we took thermodynamic dissolution model of carbonate rocks and the lithological characteristics to estimate soil loss tolerance, then corrected and quantitatively evaluated the soil erosion. We identified the spatial pattern of soil loss tolerance in karst area, found RUSLE overestimated soil erosion in karst area and proposed an idea for evaluating soil erosion in karst.
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