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Purpose <p>Preferential infiltration is prevalent in low-hilly areas and has a significant influence on soil hydrological processes. Changes in land use are widely acknowledged as factors that affecting preferential infiltration. Nevertheless, the influence of prolonged vegetation restoration on soil permeability and the development of preferential flow remains inadequately understood.</p> Methods <p>In this study, the dye tracer method and laboratory experiments were adopted to quantitatively assess disparities in the physicochemical properties of soils and their effects on the development of preferential flow and soil permeability among the three land types in typical low-hilly areas.</p> Results <p>The findings suggest that (1) forest and dry land show a higher soil infiltrability than paddy fields, with stable-state infiltration rates at depths of 0–20&#xa0;cm and 20–40&#xa0;cm being elevated by 43.52–73.15% and 129.41–529.41%, respectively. (2) The development of preferential flow varies in accordance with land use patterns; in particular, forest land has the lowest stained area ratio (20%) and matrix flow depth (2.15&#xa0;cm), while demonstrating the highest preferential flow ratio (84.93%), length index (10.11), stained variation coefficient (0.91), and peak number (19.40) when compared to dry land and paddy fields. (3) Variance analysis revealed that soil bulk density and moisture content impede the development of preferential flow and infiltrability, whereas increased porosity and organic matter content facilitate infiltration and preferential flow.</p> Conclusions <p>Our findings indicate that long-term vegetation restoration markedly improves soil infiltrability and promotes preferential flow pathways. It is crucial to consider this effect when assessing the influence of vegetation restoration on seasonal water scarcity in low-hill regions.</p>

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Effects of Land-Use Change on Soil Infiltrability and Preferential Flow in Typical Low Hilly Area

  • 期刊论文

  • 发表日期：

    2025年7月21日

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  • Linlin Chu,
  • Rong Ma,
  • Yue Liu,
  • Yan Zhao,
  • Lidong Bi,
  • Chen Dan

摘要

Purpose

Preferential infiltration is prevalent in low-hilly areas and has a significant influence on soil hydrological processes. Changes in land use are widely acknowledged as factors that affecting preferential infiltration. Nevertheless, the influence of prolonged vegetation restoration on soil permeability and the development of preferential flow remains inadequately understood.

Methods

In this study, the dye tracer method and laboratory experiments were adopted to quantitatively assess disparities in the physicochemical properties of soils and their effects on the development of preferential flow and soil permeability among the three land types in typical low-hilly areas.

Results

The findings suggest that (1) forest and dry land show a higher soil infiltrability than paddy fields, with stable-state infiltration rates at depths of 0–20 cm and 20–40 cm being elevated by 43.52–73.15% and 129.41–529.41%, respectively. (2) The development of preferential flow varies in accordance with land use patterns; in particular, forest land has the lowest stained area ratio (20%) and matrix flow depth (2.15 cm), while demonstrating the highest preferential flow ratio (84.93%), length index (10.11), stained variation coefficient (0.91), and peak number (19.40) when compared to dry land and paddy fields. (3) Variance analysis revealed that soil bulk density and moisture content impede the development of preferential flow and infiltrability, whereas increased porosity and organic matter content facilitate infiltration and preferential flow.

Conclusions

Our findings indicate that long-term vegetation restoration markedly improves soil infiltrability and promotes preferential flow pathways. It is crucial to consider this effect when assessing the influence of vegetation restoration on seasonal water scarcity in low-hill regions.