Preprints
https://doi.org/10.5194/nhess-2018-310
https://doi.org/10.5194/nhess-2018-310

  30 Oct 2018

30 Oct 2018

Review 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 Cao1,2,3, Shijie Wang1,3, Xiaoyong Bai1,3, Huiwen Li1,2,3, Cheng Zeng1,3, Yichao Tian4, Fei Chen1,3, Luhua Wu1,2,3, and Mingming Wang1,2,3 Yue Cao et al.
  • 1State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 99 Lincheng West Road, Guiyang 550081, Guizhou Province, China
  • 2University of Chinese Academy of Sciences, Beijing 100049, China
  • 3Puding Karst Ecosystem Observation and Research Station, Chinese Academy of Sciences, Puding 562100, China
  • 4School of Resources and Environment of Qinzhou University, Qinzhou 535099, China

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.

Yue Cao et al.

 
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Yue Cao et al.

Yue Cao et al.

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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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