Soil bioengineering has been leveraged for controlling shallow landslides and soil erosion. Acacia mangium Willd. species is widely used for soil bioengineering, but its root properties have not been extensively investigated. This study aimed to measure the various properties (i.e., morphological traits, biomechanical properties, chemical composition and root reinforcement) for establishing roots of A. mangium Willd. species through a series of laboratory experiments (i.e., rhizobox observation, uniaxial tensile test, direct shear and volumetric water content and suction monitoring). The results underscored the rapid growth (i.e., 0.43 ± 0.01 cm/day) and highlighted variations in “side” root area ratios of A. mangium Willd. species with depth. Root orientation also demonstrated a significant correlation with root diameter following a linear model (p < 0.05, R ² = 0.39). At the early-stage establishment (28 weeks), A. mangium Willd. roots exhibited the tensile strength, Young's modulus and mechanical reinforcement of 10.18 ± 0.62 MPa, 325.18 ± 21.72 MPa and 3.15 kPa, respectively. The presence of roots was found to increase the soil suction, air-entry value and saturated water content of lateritic soil by improving the soil-water characteristic curve. This work elucidated the root properties of A. mangium Willd. during the early-stage establishment, raising caution for the design of slope-stabilisation projects using soil bioengineering, especially during the initial phase of projects.

中文翻译：

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对 Acacia mangium 幼根的全面研究 Willd。土壤生物工程物种


土壤生物工程已被用于控制浅层滑坡和土壤侵蚀。金合欢威尔德。物种被广泛用于土壤生物工程，但其根特性尚未得到广泛研究。本研究旨在测量 A. mangium Willd 建立根系的各种特性 （即形态性状、生物力学特性、化学成分和根加固）。物种通过一系列实验室实验（即 Rhizobox 观察、单轴拉伸试验、直接剪切和体积含水量以及吸力监测）。结果强调了快速生长（即 0.43 ± 0.01 厘米/天），并突出了 A. mangium Willd 的“侧面”根面积比率的变化。具有深度的物种。根取向也显示出与线性模型的根直径显著相关 （p < 0.05， R² = 0.39）。在早期建立（28 周），A. mangium Willd.根系的拉伸强度、杨氏模量和机械增强分别为 10.18 ± 0.62 MPa、325.18 ± 21.72 MPa 和 3.15 kPa。发现根系的存在通过改善土-水特征曲线来提高红土土壤的吸力、入气值和饱和含水量。这项工作阐明了 A. mangium Willd 的根特性。在建立初期阶段，特别是项目初期阶段，对使用土壤生物工程设计边坡稳定项目提出了谨慎的态度。