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Spatial variability of surface soil saturated hydraulic conductivity in a small karst catchment of southwest China

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Abstract

Soil saturated hydraulic conductivity (K s) is one of the most important parameters that determine soil water redistribution. However, it is little known in a karst area with thin, discontinuous, and rocky soils. The purpose of this paper was to investigate the spatial variability of K s and its influencing factors in a small karst catchment with high heterogeneity in southwest China. Undisturbed surface (0–10 cm) soil samples were collected with metal cylinders from an 80 m × 80 m grid for measuring K s, bulk density (ρb), non-capillary porosity (NCP), and capillary porosity (CP). Disturbed surface samples were taken with a shovel to measure soil organic carbon (SOC) and rock fragment content (RC). Environmental factors including topographical location (slope and depression), land-use type (forestland, shrubland, shrub-grassland, and farmland), slope gradient, slope exposure, and elevation were investigated for each sampling point. The results showed that K s value was relatively high (9.10 m/d) with a moderate variation, and had a strong spatial dependence (nugget/sill value = 0.06 %). NCP showed a very significantly (p < 0.01) positive correlation but ρb showed a very significantly negative correlation with K s. RC and SOC had significantly (p < 0.05) positive correlations but CP had no obvious effect on K s. This indicated that NCP and ρb were the dominant influencing factors of K s in a karst area. The effects of topographical locations and land-use types on K s were not significant (p > 0.05), but their interaction effects were significant. This suggested that the influencing factors were more complex and they should be considered together in a karst area. The mean K s value was the lowest in the forestland on the hillslope and in the farmland in the depression, indicating where the surface runoff may appear easily. Such results could help to better understand the soil hydrological processes and contribute to the building of hydrological models in small karst catchments.

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Acknowledgments

This research was supported by National Key Basic Research Program of China (2015CB452703), the Action Plan for the Development of Western China of Chinese Academy of Sciences (KZCX2-XB3-10), and the National Natural Science Foundation of China (41171187 and 51379205).

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Authors and Affiliations

  1. Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, 410125, Changsha, China

    Tonggang Fu, Hongsong Chen, Wei Zhang, Yunpeng Nie, Peng Gao & Kelin Wang

  2. Huanjiang Observation and Research Station for Karst Ecosystems, Chinese Academy of Sciences, 547100, Huanjiang, Guangxi, China

    Tonggang Fu, Hongsong Chen, Wei Zhang, Yunpeng Nie, Peng Gao & Kelin Wang

  3. University of Chinese Academy of Sciences, 100049, Beijing, China

    Tonggang Fu & Peng Gao

Authors
  1. Tonggang Fu
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  2. Hongsong Chen
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  3. Wei Zhang
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  4. Yunpeng Nie
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  5. Peng Gao
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  6. Kelin Wang
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Correspondence to Hongsong Chen.

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Fu, T., Chen, H., Zhang, W. et al. Spatial variability of surface soil saturated hydraulic conductivity in a small karst catchment of southwest China. Environ Earth Sci 74, 2381–2391 (2015). https://doi.org/10.1007/s12665-015-4238-5

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  • DOI: https://doi.org/10.1007/s12665-015-4238-5

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