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Background and aims <p>Plant roots in soil eco-engineering and in nature are susceptible to the combined effects of environmental stress and cyclic loading (e.g., wind blowing and runoff scouring). These effects may weaken the root reinforcement capacity and intensify soil erosion.</p> Methods <p>Using the roots of <i>Indigofera amblyantha</i> Craib as the object of study, we explored the changes in root tensile strength by conducting all-cross root tensile tests with three environmental conditions (natrual, drought, and waterlogging) and four loading modes (low, high, alternative magnitude cyclic loading and single loading). From the perspective of live material, we correlated root activity with tensile strength. In particular, root section and chemical composition determination were conducted to elucidate the deeper causes of changes in the root tensile strength and to assess the trends of root’s soil reinforcement capacity.</p> Results <p>The results demonstrated that the root diameter affected the root tensile strength by changing both the root lignin/cellulose ratio and the characteristics of the vessel pore distribution. Short-term waterlogging and drought stress reduced root tensile strength, with the lowest tensile strength under waterlogging stress. The application of both high-magnitude cyclic and alternating-magnitude cyclic loading resulted in an increase in the root tensile strength. The weakest root tensile strength was observed when waterlogging stress was combined with low-magnitude cyclic loading.</p> Conclusion <p>In conclusion, for slopes in soil eco-engineering where long-term rainfall is accompanied by runoff erosion, the soil reinforcement and erosion resistance capacity may be lower than the expected design.</p>

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Combined effects of cyclic loading and environmental stress on the tensile strength of Indigofera amblyantha Craib roots

  • 期刊论文

  • 发表日期：

    2025年8月6日

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  • Yueshu Yang,
  • Zhongkai Liu,
  • Qi Yang,
  • Jinshun Chen,
  • Yun Hu,
  • Hai Xiao,
  • Jian Wu,
  • Dong Xia,
  • Yang Lu,
  • Xudong Hu,
  • Zhenyao Xia,
  • Mingtao Zhou,
  • Wennian Xu,
  • Jiangang Chen,
  • Daxiang Liu

摘要

Background and aims

Plant roots in soil eco-engineering and in nature are susceptible to the combined effects of environmental stress and cyclic loading (e.g., wind blowing and runoff scouring). These effects may weaken the root reinforcement capacity and intensify soil erosion.

Methods

Using the roots of Indigofera amblyantha Craib as the object of study, we explored the changes in root tensile strength by conducting all-cross root tensile tests with three environmental conditions (natrual, drought, and waterlogging) and four loading modes (low, high, alternative magnitude cyclic loading and single loading). From the perspective of live material, we correlated root activity with tensile strength. In particular, root section and chemical composition determination were conducted to elucidate the deeper causes of changes in the root tensile strength and to assess the trends of root’s soil reinforcement capacity.

Results

The results demonstrated that the root diameter affected the root tensile strength by changing both the root lignin/cellulose ratio and the characteristics of the vessel pore distribution. Short-term waterlogging and drought stress reduced root tensile strength, with the lowest tensile strength under waterlogging stress. The application of both high-magnitude cyclic and alternating-magnitude cyclic loading resulted in an increase in the root tensile strength. The weakest root tensile strength was observed when waterlogging stress was combined with low-magnitude cyclic loading.

Conclusion

In conclusion, for slopes in soil eco-engineering where long-term rainfall is accompanied by runoff erosion, the soil reinforcement and erosion resistance capacity may be lower than the expected design.