Scholarlink

<p>Soil erosion and shallow landslides in the upper reaches of the Yellow River, China, are increasing due to extreme climate events and human disturbances. The biomechanical properties of vegetation roots play an important role in soil stabilization and fixation, as they resist soil erosion and shallow landslides in this area. However, the biomechanical properties of the roots of dominant herbs and their influencing factors in this area remain poorly understood. Therefore, we selected two dominant herbs in this area, <i>Stipa aliena</i> Keng and <i>Poa crymophila</i> Keng, and carried out a series of uniaxial tensile tests on the roots of the two herbs under different treatments. Meanwhile, the effects of root diameter, plant species, gauge length, root water content, and loading rate on the biomechanical properties of the two herbs’ roots were analyzed. The results showed that root diameter was the most significant factor affecting the root biomechanical properties (<i>P</i>&lt;0.010), and root tensile force displayed a positive power law relationship with root diameter, whereas root tensile strength and Young’s modulus followed negative power law correlations with root diameter, and fracture strain increased linearly with root diameter. Root tensile force, tensile strength, and fracture strain of <i>S. aliena</i> were significantly greater than those of <i>P. crymophila</i> (<i>P</i>&lt;0.001), which was mainly due to the higher lignin content and lignin:cellulose ratio of <i>S. aliena</i> roots. During uniaxial tensile process, hydrated roots exhibited elastic-plastic-brittle behavior, whereas dried roots exhibited elastic-brittle behavior. Root fracture strain of the two herbs was significantly lower under 100 mm gauge length than under 50 mm gauge length (<i>P</i>&lt;0.001), and the Young’s modulus was significantly greater (<i>P</i>&lt;0.050). Tensile strength and fracture strain of hydrated roots of the two herbs were significantly greater than those of dried roots (<i>P</i>&lt;0.050), whereas the Young’s modulus was significantly lower (<i>P</i>&lt;0.001). Root tensile force, tensile strength, and fracture strain of <i>S. aliena</i> were significantly greater under 20 mm/min loading rate than under 200 mm/min loading rate (<i>P</i>&lt;0.050), whereas loading rate had no significant effect on the root biomechanical properties of <i>P. crymophila</i> (<i>P</i>&gt;0.050). Fibrous roots of the two herbs were well developed, with relatively high tensile strengths and Young’s moduli of 78.498 and 837.901 MPa for <i>S. aliena</i>, and 67.541 and 901.184 MPa for <i>P. crymophila</i>, respectively. The two herbs can stabilize soil and prevent soil erosion and can be used as pioneer species for ecological restoration in the upper reaches of the Yellow River. These results provide a theoretical basis for soil erosion and shallow landslide control in the giant landslide area of the upper reaches of the Yellow River.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Root biomechanical properties and influencing factors of two dominant herbs in the landslide area of the upper reaches of the Yellow River, China

  • 期刊论文

  • 发表日期：

    2025年12月18日

查看全文
  • Guangyan Xing,
  • Xiasong Hu,
  • Changyi Liu,
  • Jimei Zhao,
  • Haijing Lu,
  • Huatan Li,
  • Guorong Li,
  • Haili Zhu,
  • Yabin Liu

摘要

Soil erosion and shallow landslides in the upper reaches of the Yellow River, China, are increasing due to extreme climate events and human disturbances. The biomechanical properties of vegetation roots play an important role in soil stabilization and fixation, as they resist soil erosion and shallow landslides in this area. However, the biomechanical properties of the roots of dominant herbs and their influencing factors in this area remain poorly understood. Therefore, we selected two dominant herbs in this area, Stipa aliena Keng and Poa crymophila Keng, and carried out a series of uniaxial tensile tests on the roots of the two herbs under different treatments. Meanwhile, the effects of root diameter, plant species, gauge length, root water content, and loading rate on the biomechanical properties of the two herbs’ roots were analyzed. The results showed that root diameter was the most significant factor affecting the root biomechanical properties (P<0.010), and root tensile force displayed a positive power law relationship with root diameter, whereas root tensile strength and Young’s modulus followed negative power law correlations with root diameter, and fracture strain increased linearly with root diameter. Root tensile force, tensile strength, and fracture strain of S. aliena were significantly greater than those of P. crymophila (P<0.001), which was mainly due to the higher lignin content and lignin:cellulose ratio of S. aliena roots. During uniaxial tensile process, hydrated roots exhibited elastic-plastic-brittle behavior, whereas dried roots exhibited elastic-brittle behavior. Root fracture strain of the two herbs was significantly lower under 100 mm gauge length than under 50 mm gauge length (P<0.001), and the Young’s modulus was significantly greater (P<0.050). Tensile strength and fracture strain of hydrated roots of the two herbs were significantly greater than those of dried roots (P<0.050), whereas the Young’s modulus was significantly lower (P<0.001). Root tensile force, tensile strength, and fracture strain of S. aliena were significantly greater under 20 mm/min loading rate than under 200 mm/min loading rate (P<0.050), whereas loading rate had no significant effect on the root biomechanical properties of P. crymophila (P>0.050). Fibrous roots of the two herbs were well developed, with relatively high tensile strengths and Young’s moduli of 78.498 and 837.901 MPa for S. aliena, and 67.541 and 901.184 MPa for P. crymophila, respectively. The two herbs can stabilize soil and prevent soil erosion and can be used as pioneer species for ecological restoration in the upper reaches of the Yellow River. These results provide a theoretical basis for soil erosion and shallow landslide control in the giant landslide area of the upper reaches of the Yellow River.