Vegetation is a widely used eco‐friendly approach for slope reinforcement and ecological restoration. As a potential planting strategy, mixed planting of plants is often recommended to improve biodiversity, but the effects of mixed planting on soil reinforcement and slope stability are not yet clear. To address this issue, a study on two typical herbaceous slope protection plants, Chrysopogon zizanioides and Cynodon dactylon, were conducted. The biomechanical characteristics of different herbaceous plants were analyzed, and their root distribution and soil reinforcement performance under single and mixed planting were explored. Results show that mixed planting could significantly increase the number and root area ratio of root systems. At 0.1 cm depth after 42 days, the root number under mixed planting increased by 111.42% compared to vetiver grass monoculture and by 19.57% compared to bermuda grass monoculture. Mixed planting can provide stronger soil reinforcement by increasing apparent cohesion, with a maximum increase in apparent cohesion of 47.9%. The results of slope stability analysis showed that vegetation mainly relied on mechanical reinforcement in the root zone and hydrological reinforcement outside the root zone. After 42 days of growth, mixed planting at 0.1 m depth increased slope stability by 11.94% compared to vetiver grass monoculture and by 27.12% compared to bermuda grass monoculture, with both mechanical and hydrological effects of vegetation significantly enhanced. These findings suggest that mixed planting can promote plant development and growth, improve root production, and enhance plant–soil reinforcement and slope stability during the early establishment of vegetation. Therefore, in formulating slope reinforcement and ecological restoration strategies, more consideration can be given to mixed planting of plants, maximizing the utilization of competition characteristics between plants, and reducing the risk of shallow landslides while improving biodiversity.

中文翻译：

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混合草种可促进根系生产和植物-土壤加固


植被是一种广泛使用的生态友好型边坡加固和生态恢复方法。作为一种潜在的种植策略，植物混植通常被推荐用于改善生物多样性，但混植对土壤加固和边坡稳定性的影响尚不清楚。为了解决这个问题，对两种典型的草本护坡植物 Chrysopogon zizanioides 和 Cynodon dactylon 进行了研究。分析了不同草本植物的生物力学特性，探究了其单株和混植下的根系分布和土壤加固性能。结果表明：混作可显著提高根系数量和根面积比。42 天后，在 0.1 cm 深度，与香根草单一栽培相比，混植下的根数增加了 111.42%，与百慕大草单一栽培相比增加了 19.57%。混作可以通过增加表观黏聚力来提供更强的土壤加固，表观黏聚力最大增加 47.9%。边坡稳定性分析结果表明，植被主要依赖根区内的机械加固和根区外的水文加固。生长 42 天后，与香根草单一栽培相比，0.1 m 深度的混合种植使边坡稳定性提高了 11.94%，与百慕大草单一栽培相比提高了 27.12%，植被的机械和水文效应均显著增强。这些发现表明，混作种植可以促进植物发育和生长，提高根系产量，并在植被建立的早期增强植物-土壤加固和边坡稳定性。 因此，在制定边坡加固和生态恢复策略时，可以更多地考虑植物混植，最大限度地利用植物间的竞争特性，在提高生物多样性的同时降低浅层滑坡的风险。