Experiment Study on Single Root Tensile Mechanical Properties of Sod Layer in Alpine Grassland in Ngoring Lake Area

Xu Dezhong; Zhang Xu; Chen Yao; Li Hongjun; Guo Xiaodong

doi:10.13961/j.cnki.stbctb.2024.06.001

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Experiment Study on Single Root Tensile Mechanical Properties of Sod Layer in Alpine Grassland in Ngoring Lake Area

- Experiment Study on Single Root Tensile Mechanical Properties of Sod Layer in Alpine Grassland in Ngoring Lake Area
- Bulletin of Soiland Water Conservation Vol. 44, Issue 6, Pages: 1-11(2024)
- 作者机构：
  
  中国地质调查局西宁自然资源综合调查中心,青海,西宁,810000
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2024.06.001
  CLC： S157.9;TU432
- Published：2024
- 稿件说明：
移动端阅览
Xu Dezhong, Zhang Xu, Chen Yao, et al. Experiment Study on Single Root Tensile Mechanical Properties of Sod Layer in Alpine Grassland in Ngoring Lake Area[J]. Bulletin of Soiland Water Conservation, 2024, 44(6): 1-11.
DOI：

Xu Dezhong, Zhang Xu, Chen Yao, et al. Experiment Study on Single Root Tensile Mechanical Properties of Sod Layer in Alpine Grassland in Ngoring Lake Area[J]. Bulletin of Soiland Water Conservation, 2024, 44(6): 1-11. DOI： 10.13961/j.cnki.stbctb.2024.06.001.

摘要

[目的] 探究鄂陵湖区生物多样性和植物根系抗拉伸力学特性，为黄河源鄂陵湖区水土流失，高寒草地草毡层滑塌等地质灾害现象的有效防治提供数据支持，为草毡层滑塌破坏机理的研究提供理论依据。[方法] 以研究区样方调查结果为依据，对区内优势草本植物开展单根拉伸试验；对比分析不同草本植物在不同根径级别条件下，单根抗拉力、单根抗拉强度、单根极限延伸率及单根弹性模量的差异性及其与根径之间的关系。[结果] 研究区内优势草本植物为青藏薹草、多枝黄耆、冷蒿、早熟禾、弱小火绒草和短穗兔耳草。在根径范围为0.10~0.60 mm条件下，以上6种草本植物单根抗拉力和单根抗拉强度随着根径的增大分别呈幂函数增长和幂函数减小的趋势，单根极限延伸率和单根弹性模量与根径之间不存在显著性函数关系。综合考虑不同植物类型的单根抗拉力学特性指标、物种重要值与根系类型，在鄂陵湖地区，早熟禾的固土能力最好。[结论] 研究区6种优势草本植物的根系均具备较好的固土潜能，其中早熟禾的固土能力最强，该研究结果可以为鄂陵湖区水土保持工作提供一定依据。

Abstract

[Objective] The biological diversity and the anti-tensile mechanical properties of plant roots in the Ngoring Lake area were investigated

to provide data support for the effective prevention and control of geological disasters such as soil erosion and the sod layer slump of alpine grassland in the Ngoring Lake area

the source of the Yellow River

as well as a theoretical basis for the research on the failure mechanism of the sod layer. [Methods] Based on the sample survey results in the study area

single-root tensile tests were performed on the dominant herbaceous plants in the area; the differences in single-root tensile strength

single-root tensile intensity

single-root ultimate elongation and single-root modulus of elasticity of the different herbaceous plants and their relationship with the root diameter were comparatively analyzed in different root-diameter levels. [Results] The dominant herbaceous plants in the study area were Carex moorcroftii

Astragalus polycladus

Artemisia frigida

Poa annua

Leontopodium pusillum. and Lagotis brachystachya. Under the condition of root diameter range of 0.10—0.60 mm

the single root tensile strength and single root tensile intensity of the above six herbaceous plants exhibited the trend of power function growth and power function decrease

respectively

with the increase of root diameter. Furthermore

there was no significant functional relationship between the single-root ultimate elongation and single-root elastic modulus and root diameter. Considering the mechanical property indexes of single root tensile resistance

species importance value

and root type of different plant types

Poa annua exhibited the best soil fixation capacity in the Ngoring Lake area. [Conclusion] The root systems of the six dominant herbaceous plants in the study area have better soil-fixing potential

among which Poa annua has the strongest soil-fixing ability. This study’s results can provide a certain basis for the soil and water conservation work in the Ngoring Lake area.

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Keywords

references

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