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Background and aims <p>Vegetation restoration duration and topographic position (erosion vs. deposition) influence soil detachment capacity (<i>Dc</i>) in karst trough valleys by altering hydraulic conditions, soil physicochemical properties, and root traits. This study evaluates the controlling and mitigating effects of vegetation restoration duration and topographic position on <i>Dc</i> in a karst trough valley environment.</p> Methods <p>We compared soil properties, root traits, and <i>Dc</i> across two grasslands restored for 5 (A5) and 10 (A10) years, using bare land (BL) as a control at both erosion and deposition sites. Relationships between <i>Dc</i> and its influencing factors were evaluated using Pearson correlation, regression analysis, and partial least squares path modeling.</p> Results <p>Key soil and root parameters, including water-stable aggregates (WSA), soil organic matter (SOM), root diameter (RD) and root volume density (RVD), increased with restoration duration and were consistently higher at deposition sites. <i>Dc</i> decreased significantly with increasing restoration time at all sites except on the bedding slope at the erosion site. There, the bedrock strata dip parallel to the slope, which limits the soil water storage capacity and renders it insufficient to counteract hydrodynamic erosion. Mean <i>Dc</i> at erosion sites was 3.56 times higher than that at deposition sites. Stream power was the strongest hydraulic predictor of <i>Dc</i>, which was also negatively correlated with bulk density (BD), WSA, SOM and RVD.</p> Conclusion <p>The results showed that SOM, WSA, root diameter, and RVD increased with restoration time. Stream power best predicted <i>Dc</i> among hydraulic parameters. Soil properties primarily controlled <i>Dc</i> at erosion sites, while hydraulic factors dominated at deposition sites.</p>

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Assessing soil detachment driven by root-soil interactions in karst trough valleys: influence of vegetation restoration on erosion–deposition contrasts

  • 期刊论文

  • 发表日期：

    2025年12月10日

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  • Yuanyue Xia,
  • Wuyi Li,
  • Lisha Jiang,
  • Fengling Gan,
  • Youjin Yan,
  • Yuchuan Fan,
  • Junbing Pu

摘要

Background and aims

Vegetation restoration duration and topographic position (erosion vs. deposition) influence soil detachment capacity (Dc) in karst trough valleys by altering hydraulic conditions, soil physicochemical properties, and root traits. This study evaluates the controlling and mitigating effects of vegetation restoration duration and topographic position on Dc in a karst trough valley environment.

Methods

We compared soil properties, root traits, and Dc across two grasslands restored for 5 (A5) and 10 (A10) years, using bare land (BL) as a control at both erosion and deposition sites. Relationships between Dc and its influencing factors were evaluated using Pearson correlation, regression analysis, and partial least squares path modeling.

Results

Key soil and root parameters, including water-stable aggregates (WSA), soil organic matter (SOM), root diameter (RD) and root volume density (RVD), increased with restoration duration and were consistently higher at deposition sites. Dc decreased significantly with increasing restoration time at all sites except on the bedding slope at the erosion site. There, the bedrock strata dip parallel to the slope, which limits the soil water storage capacity and renders it insufficient to counteract hydrodynamic erosion. Mean Dc at erosion sites was 3.56 times higher than that at deposition sites. Stream power was the strongest hydraulic predictor of Dc, which was also negatively correlated with bulk density (BD), WSA, SOM and RVD.

Conclusion

The results showed that SOM, WSA, root diameter, and RVD increased with restoration time. Stream power best predicted Dc among hydraulic parameters. Soil properties primarily controlled Dc at erosion sites, while hydraulic factors dominated at deposition sites.