Volume 43 Issue 1
Jan.  2024
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WANG Fa, NIE Yunpeng, CHEN Hongsong, FU Zhiyong, LIAN Jinjiao. Spatial heterogeneity characteristics of soil-epikarst thickness in a typical karst dolomite small watershed[J]. Bulletin of Geological Science and Technology, 2024, 43(1): 306-314. doi: 10.19509/j.cnki.dzkq.tb20220399
Citation: WANG Fa, NIE Yunpeng, CHEN Hongsong, FU Zhiyong, LIAN Jinjiao. Spatial heterogeneity characteristics of soil-epikarst thickness in a typical karst dolomite small watershed[J]. Bulletin of Geological Science and Technology, 2024, 43(1): 306-314. doi: 10.19509/j.cnki.dzkq.tb20220399

Spatial heterogeneity characteristics of soil-epikarst thickness in a typical karst dolomite small watershed

doi: 10.19509/j.cnki.dzkq.tb20220399
More Information
  • Author Bio:

    WANG Fa, E-mail: wangfa110@126.com

  • Corresponding author: LIAN Jinjiao, E-mail: lianjinjiao@isa.ac.cn
  • Received Date: 24 Jul 2022
  • Accepted Date: 30 Aug 2022
  • Rev Recd Date: 24 Aug 2022
  • Objective

    The thickness of soilepikarst is an important index affecting the hydrological process of critical zones. The spatial heterogeneity is critical understanding the structural evolution mechanism of the key zones of the Earth and the water conservation function of the key zones of the Earth.

    Methods

    Based on the 1.4 km2 area of the Mulian catchment in Huanjiang, Guangxi, the 1 731 soil-epikarst thickness samples were obtained through electrical resistivity tomography (ERT) with 45 sampling lines.The spatial distribution pattern of soil and epikarst thickness and its influencing factors were investigated. The results showed that the average thickness of soil and epikarst was 1.15 m and 6.44 m with strong and medium variance, respectively.

    Results

    The results of geostatistical analysis indicated that the spherical model and exponential model could reflect the spatial structure characteristics of soil and epikarst thickness, respectively. Soil thickness showed moderate spatial autocorrelation, a long range and good spatial continuity. However, the epikarst presented strong spatial autocorrelation and spatial dependence with a short range. Soil thickness was affected by multiple environmental factors (topographic wetness index, vertical curvature, curvature, aspect, slope, elevation, coverage, outcrop ratio and NDVI), while the thickness of epikarst was more affected by soil thickness and vegetation type.

    Conclusion

    These results are helpful for understanding the evolution of the soil-epikarst zone and provide a scientific basis for the spatial prediction of soil-epikarst thickness in karst areas.

     

  • The authors declare that no competing interests exist.
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