Effects of Different Plant Spacings on Preferential Flow Development Characteristics of Vetiver Plant Slopes

Yu Shi; Li Zhenyu; Wang Mengke; Jiang Xueliang; Ouyang Miao

doi:10.13961/j.cnki.stbctb.2022.03.008

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Effects of Different Plant Spacings on Preferential Flow Development Characteristics of Vetiver Plant Slopes

- Effects of Different Plant Spacings on Preferential Flow Development Characteristics of Vetiver Plant Slopes
- Bulletin of Soiland Water Conservation Vol. 42, Issue 3, Pages: 49-56(2022)
- 作者机构：
  
  中南林业科技大学土木工程学院,湖南,长沙,410004
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2022.03.008
  CLC： S152.7
- Published：2022
- 稿件说明：
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Yu Shi, Li Zhenyu, Wang Mengke, et al. Effects of Different Plant Spacings on Preferential Flow Development Characteristics of Vetiver Plant Slopes[J]. Bulletin of Soiland Water Conservation, 2022, 42(3): 49-56.
DOI：

Yu Shi, Li Zhenyu, Wang Mengke, et al. Effects of Different Plant Spacings on Preferential Flow Development Characteristics of Vetiver Plant Slopes[J]. Bulletin of Soiland Water Conservation, 2022, 42(3): 49-56. DOI： 10.13961/j.cnki.stbctb.2022.03.008.

摘要

[目的] 分析优先流在香根草边坡中的发育特征，研究植物根系与优先流之间的关系，为进一步研究降雨条件下植物根系对边坡土体稳定性的影响提供理论依据。[方法] 以种植间距为50 cm和10 cm的香根草为研究对象，模拟30 mm和50 mm两种不同的降雨量，采用示踪剂试验研究了香根草边坡土壤的优先流发育特征。[结果] 香根草种植间距从50 cm减少到10 cm会增大边坡的水力响应。在50 mm的降雨量作用下，10 cm种植间距的香根草边坡土壤的染色面积比率和优先流比分别是50 cm的1.55，1.76倍。表层土0—10 cm土层深度范围内染色路径数量变化不明显，在10—35 cm深度土层范围，10 cm种植间距的染色路径数量多于50 cm种植间距的香根草边坡土壤。当降雨量由30 mm增加至50 mm时，水流会通过优势通道更迅速迁移到边坡土壤中。降雨量为30 mm土壤的染色面积比率（36.11%）和优先流比（67.25%）小于50 mm土壤的染色面积比率（49.68%）和优先流比（79.96%），并且染色路径数量随着降雨量的增加而增多。[结论] 香根草根系特征与优先流关系密切。选择植物护坡时，应合理选择植物的种植间距，使根系护坡在力学效应和水文效应上最大化。

Abstract

[Objective] The development characteristics of preferential flow for a vetiver slope and the relationship between vetiver roots and preferential flow were analyzed in order to provide a theoretical basis for further study on the influence of plant roots on slope soil stability under varying rainfall conditions.[Methods] Preferential flow on a vetiver slope was studied by using a dye tracer test with simulated rainfall amounts of 30 mm and 50 mm

and plant spacings of 50 cm and 10 cm.[Results] The hydraulic response of the slope soil was greatly increased when vetiver plant spacing was reduced from 50 cm to 10 cm. Under the action of 50 mm of rainfall

the dyeing area ratio and preferential flow ratio for the 10 cm plant spacing were 1.55 and 1.76 times of those for the 50 cm plant spacing

respectively. There was no obvious change in the number of dyeing paths within the topsoil depth range of 0-10 cm. In the topsoil depth range of 10-35 cm

the number of dyeing paths with the 10 cm plant spacing was more than that of the vetiver slope soil with the 50 cm plant spacing. When rainfall was increased from 30 mm to 50 mm

the water flow migrated more quickly into the sloped soil through the dominant channel. The dyeing area ratio (36.11%) and preferential flow ratio (67.25%) with 30 mm rainfall was less than the dyeing area ratio (49.68%) and preferential flow ratio (79.96%) with 50 mm rainfall. The number of dyed paths increased with increasing rainfall.[Conclusion] The root characteristics of vetiver were closely related to preferential flow. When selecting plant slope protection

reasonable plant spacing should be selected to maximize the mechanical and hydrological effects of root slope protection.

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