A Biomechanical Study of Potential Plants for Erosion Control and Slope Stabilization of Highland in Thailand

Sustainability Pub Date : 2024-07-25 DOI:10.3390/su16156374

W. Mairaing, A. Jotisankasa, Nisa Leksungnoen, Monir Hossain, C. Ngernsaengsaruay, Prem Rangsiwanichpong, J. Pilumwong, S. Pramusandi, Surat Semmad, A. Ahmmed

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Abstract

Soil bioengineering provides a sustainable method for erosion control and soil slope stabilization using vegetation with multiple co-benefits. This study evaluated ten plant species in Thailand’s highland regions for their soil bioengineering potential and additional benefits. Root architecture, tensile strength, and Young’s modulus were measured to compare biomechanical traits. G. sepium, F. griffithii, P. americana, B. asiatica, and C. arabica exhibited H-type roots with wide lateral spread, while M. denticulata and C. officinarum had VH-type roots with deep taproots and wide lateral extent. A. sutepensis showed M-type roots with most root matrix in the top 0.3 m, where C. cajan and C. sinensis had R-type roots with deep, oblique growth. Most species showed a negative power relationship between the root strength and Young’s modulus with the root diameter except C. cajan that showed a positive correlation. P. americana, F. griffithii, C. officinarum, and C. arabica showed relatively high values of 1 mm root tensile strength (exceeding 24 to 42 MPa), while M. denticulata, G. sepium, and B. asiatica exhibited intermediate root tensile strength (ranging from 8 to 19 MPa). A. sutepensis, C. cajan, and C. sinensis demonstrated the lowest root tensile strength, up to 7 MPa. It is advised to plan slope vegetation by selecting diverse plant species with varying root structures and benefits, addressing both engineering and socioeconomic needs of the sustainable nature-based solution.

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泰国高地潜在侵蚀控制和斜坡稳定植物的生物力学研究

土壤生物工程是一种利用植被控制侵蚀和稳定土坡的可持续方法，具有多重共同效益。这项研究对泰国高原地区的十种植物进行了评估，以了解其土壤生物工程的潜力和附加效益。测量了根系结构、抗拉强度和杨氏模量，以比较其生物力学特征。G.sepium、F.griffithii、P.americana、B.asiatica 和 C. arabica 的根系为 H 型，侧向分布较广，而 M. denticulata 和 C. officinarum 的根系为 VH 型，直根较深，侧向分布较广。A. sutepensis 表现为 M 型根，大部分根基质在顶部 0.3 米处，而 C. cajan 和 C. sinensis 则表现为 R 型根，根深而斜。除 C. cajan 外，大多数物种的根强度和杨氏模量与根直径呈负相关。P. americana、F. griffithii、C. officinarum 和 C. arabica 的 1 毫米根抗拉强度值相对较高（超过 24 至 42 兆帕），而 M. denticulata、G. sepium 和 B. asiatica 的根抗拉强度处于中等水平（8 至 19 兆帕）。A. sutepensis、C. cajan 和 C. sinensis 的根抗拉强度最低，仅为 7 兆帕。建议在规划边坡植被时，选择具有不同根系结构和效益的多种植物物种，以满足可持续自然解决方案的工程和社会经济需求。

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Sustainability

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