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Impacts of Soil Properties, Topography, and Environmental Features on Soil Water Holding Capacities (SWHCs) and Their Interrelationships

Author

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  • Hyunje Yang

    (Forest Restoration and Resource Management Division, National Institute of Forest Science, Seoul 02455, Korea)

  • Hyeonju Yoo

    (Forest Restoration and Resource Management Division, National Institute of Forest Science, Seoul 02455, Korea)

  • Honggeun Lim

    (Forest Restoration and Resource Management Division, National Institute of Forest Science, Seoul 02455, Korea)

  • Jaehoon Kim

    (Forest Restoration and Resource Management Division, National Institute of Forest Science, Seoul 02455, Korea)

  • Hyung Tae Choi

    (Forest Restoration and Resource Management Division, National Institute of Forest Science, Seoul 02455, Korea)

Abstract

Soil water holding capacities (SWHCs) are among the most important factors for understanding the water cycle in forested catchments because they control available plant water that supports evapotranspiration. The direct determination of SWHCs, however, is time consuming and expensive, so many pedotransfer functions (PTFs) and digital soil mapping (DSM) models have been developed for predicting SWHCs. Thus, it is important to select the correct soil properties, topographies, and environmental features when developing a prediction model, as well as to understand the interrelationships among variables. In this study, we collected soil samples at 971 forest sites and developed PTF and DSM models for predicting three kinds of SWHCs: saturated water content ( θ S ) and water content at pF1.8 and pF2.7 ( θ 1.8 and θ 2.7 ). Important explanatory variables for SWHC prediction were selected from two variable importance analyses. Correlation matrix and sensitivity analysis based on the developed models showed that, as the matric suction changed, the soil physical and chemical properties that influence the SWHCs changed, i.e., soil structure rather than soil particle distribution at θ S , coarse soil particles at θ 1.8 , and finer soil particle at θ 2.7 . In addition, organic matter had a considerable influence on all SWHCs. Among the topographic features, elevation was the most influential, and it was closely related to the geological variability of bedrock and soil properties. Aspect was highly related to vegetation, confirming that it was an important variable for DSM modeling. Information about important variables and their interrelationship can be used to strengthen PTFs and DSM models for future research.

Suggested Citation

  • Hyunje Yang & Hyeonju Yoo & Honggeun Lim & Jaehoon Kim & Hyung Tae Choi, 2021. "Impacts of Soil Properties, Topography, and Environmental Features on Soil Water Holding Capacities (SWHCs) and Their Interrelationships," Land, MDPI, vol. 10(12), pages 1-15, November.
  • Handle: RePEc:gam:jlands:v:10:y:2021:i:12:p:1290-:d:686970
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    References listed on IDEAS

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    1. Norikazu Matsuoka & Julian Murton, 2008. "Frost weathering: recent advances and future directions," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 19(2), pages 195-210, April.
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    Cited by:

    1. Hyunje Yang & Honggeun Lim & Haewon Moon & Qiwen Li & Sooyoun Nam & Jaehoon Kim & Hyung Tae Choi, 2022. "Simple Optimal Sampling Algorithm to Strengthen Digital Soil Mapping Using the Spatial Distribution of Machine Learning Predictive Uncertainty: A Case Study for Field Capacity Prediction," Land, MDPI, vol. 11(11), pages 1-18, November.

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