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<p>Research on the spatial variability of loess permeability is important for revealing the uncertainty of groundwater flow in loess areas and improving water resource protection measures. The Jing River and Gan River watersheds in northwest China were selected as a typical study area in this study to explore the spatial variability of soil permeability in the loess areas. A total of 48 infiltration tests were performed within the study area and hydraulic conductivity coefficients were calculated at each point. Statistical and geostatistical methods were employed to analyse the spatial variability of hydraulic conductivity in the study area and the influencing factors such as irrigation activity, land use types, and topography. The IDW method was used for spatial interpolation of hydraulic conductivity. The results revealed that the hydraulic conductivity in the study area ranged from 0.16 to 5.93&#xa0;m/d and generally exhibited higher values in the northeast and lower values in the southwest. Irrigation had a weak impact on soil permeability, while land use type and topography had a more significant influence. Specifically, wild ground areas had the smallest mean hydraulic conductivity value of 0.786&#xa0;m/d, while grassland areas had the largest mean hydraulic conductivity value of 2.302&#xa0;m/d. Regarding topography, slope exhibited a positive correlation with hydraulic conductivity, with a Pearson correlation coefficient of 0.894, while elevation had no significant effect. The findings of this study can serve as a theoretical foundation for subsequent measures related to water environmental protection and management, as well as soil erosion prevention and control.</p>

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Spatial variability of soil permeability in a loess-covered area, China and its influencing factors

  • 期刊论文

  • 发表日期：

    2025年2月7日

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  • Jiahui Li,
  • Jianhua Wu,
  • Peiyue Li,
  • Yuanhang Wang,
  • Yinfu Chen

摘要

Research on the spatial variability of loess permeability is important for revealing the uncertainty of groundwater flow in loess areas and improving water resource protection measures. The Jing River and Gan River watersheds in northwest China were selected as a typical study area in this study to explore the spatial variability of soil permeability in the loess areas. A total of 48 infiltration tests were performed within the study area and hydraulic conductivity coefficients were calculated at each point. Statistical and geostatistical methods were employed to analyse the spatial variability of hydraulic conductivity in the study area and the influencing factors such as irrigation activity, land use types, and topography. The IDW method was used for spatial interpolation of hydraulic conductivity. The results revealed that the hydraulic conductivity in the study area ranged from 0.16 to 5.93 m/d and generally exhibited higher values in the northeast and lower values in the southwest. Irrigation had a weak impact on soil permeability, while land use type and topography had a more significant influence. Specifically, wild ground areas had the smallest mean hydraulic conductivity value of 0.786 m/d, while grassland areas had the largest mean hydraulic conductivity value of 2.302 m/d. Regarding topography, slope exhibited a positive correlation with hydraulic conductivity, with a Pearson correlation coefficient of 0.894, while elevation had no significant effect. The findings of this study can serve as a theoretical foundation for subsequent measures related to water environmental protection and management, as well as soil erosion prevention and control.