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<p>The strategic selection of plant species mixtures is crucial for enhancing slope stability and controlling soil erosion. However, the effect of mixed plants on soil reinforcement remains unclear.&#xa0;This study evaluated how interspecific interactions among alfalfa (<i>Medicago sativa</i>), ryegrass (<i>Lolium perenne</i>), and vetiver (<i>Chrysopogon zizanioides</i>) influence root morphology and soil reinforcement in remolded loess. Root morphological investigation and direct shear tests were conducted on loess cuboids with single or mixed species planting. Systematic comparisons were made between monoculture and polyculture groups through standardized laboratory experiments under controlled experimental conditions.&#xa0;A key finding was the identification of a highly synergistic ryegrass-vetiver mixture that provided superior soil reinforcement. Results demonstrated that ryegrass competitively suppressed the growth of alfalfa and vetiver in mixtures. In contrast, alfalfa and vetiver exhibited a mutually beneficial root complementarity. While all vegetated samples significantly increased soil shear strength compared to non-rooted loess, the ryegrass-vetiver mixture achieved the maximum reinforcement, highlighting a potent synergistic root-soil binding effect.&#xa0;Consequently, these findings provide direct technical references for optimizing species selection and combination strategies in ecological restoration and soil and water conservation projects within loess regions.</p>

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Interspecific Effects of Mixed Herbaceous Roots on the Shear Properties of Loess

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Shuqi Si,
  • Chaobo Zhang,
  • Peng Zhan,
  • Jing Jiang

摘要

The strategic selection of plant species mixtures is crucial for enhancing slope stability and controlling soil erosion. However, the effect of mixed plants on soil reinforcement remains unclear. This study evaluated how interspecific interactions among alfalfa (Medicago sativa), ryegrass (Lolium perenne), and vetiver (Chrysopogon zizanioides) influence root morphology and soil reinforcement in remolded loess. Root morphological investigation and direct shear tests were conducted on loess cuboids with single or mixed species planting. Systematic comparisons were made between monoculture and polyculture groups through standardized laboratory experiments under controlled experimental conditions. A key finding was the identification of a highly synergistic ryegrass-vetiver mixture that provided superior soil reinforcement. Results demonstrated that ryegrass competitively suppressed the growth of alfalfa and vetiver in mixtures. In contrast, alfalfa and vetiver exhibited a mutually beneficial root complementarity. While all vegetated samples significantly increased soil shear strength compared to non-rooted loess, the ryegrass-vetiver mixture achieved the maximum reinforcement, highlighting a potent synergistic root-soil binding effect. Consequently, these findings provide direct technical references for optimizing species selection and combination strategies in ecological restoration and soil and water conservation projects within loess regions.