A study of the mechanical properties of herbaceous roots and root-soil composite systems in the degraded alpine pasture artificially restored grassland

HE Weipeng; LIU Changyi; ZHOU Guoying; HU Xiasong; FU Jiangtao; LU Haijing; YAN Cong; YANG Fucheng; LI Guorong

doi:10.16030/j.cnki.issn.1000-3665.202108052

2022 Vol. 49, No. 2

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Article navigation > Hydrogeology & Engineering Geology > 2022 > 49(2): 207-218

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HE Weipeng, LIU Changyi, ZHOU Guoying, HU Xiasong, FU Jiangtao, LU Haijing, YAN Cong, YANG Fucheng, LI Guorong. A study of the mechanical properties of herbaceous roots and root-soil composite systems in the degraded alpine pasture artificially restored grassland[J]. Hydrogeology & Engineering Geology, 2022, 49(2): 207-218. doi: 10.16030/j.cnki.issn.1000-3665.202108052

Citation:

HE Weipeng, LIU Changyi, ZHOU Guoying, HU Xiasong, FU Jiangtao, LU Haijing, YAN Cong, YANG Fucheng, LI Guorong. A study of the mechanical properties of herbaceous roots and root-soil composite systems in the degraded alpine pasture artificially restored grassland[J]. Hydrogeology & Engineering Geology, 2022, 49(2): 207-218. doi: 10.16030/j.cnki.issn.1000-3665.202108052

A study of the mechanical properties of herbaceous roots and root-soil composite systems in the degraded alpine pasture artificially restored grassland

1.
Department of Geological Engineering, Qinghai University, Xining, Qinghai　810016, China
2.
Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, Qinghai　810008, China
3.
Academy of Agriculture and Forestry, Qinghai University, Xining, Qinghai　810016, China
4.
College of Agriculture and Animal Husbandry, Qinghai University, Xining, Qinghai　810016, China

More Information

Corresponding author: LIU Changyi, 1358128151@qq.com

Received Date: 25 August 2021

Revised Date: 15 December 2021

Accepted Date: 29 December 2021

Publish Date: 15 March 2022

Abstract

Abstract

To study the reinforcement to soil by herb roots along the Qinghai-Tibet railway, an artificially restored grassland along the Qinghai-Tibet railway is selected as test site. By conducting tensile tests to a single root and direct shear tests to the root-soil composite system with its growth period of one year, such mechanical indices as roots’ tensile strength and shear strength of root-soil composite system are quantitatively assessed. The results show that the values of the mean root diameter, tensile resistance and tensile strength for the combination I (Agropyron cristatum + Puccinellia distans + Poa crymophila) are greater than those for the other combinations. Moreover, a positive power function can be introduced to describe the relationship between the root diameter and its tensile resistance for the three species, while a negative power function is introduced to describe the relationship between the root diameter and its tensile strength. In addition, the cohesion of the root-soil composite system for the three species exhibits a decreasing trend with the increasing soil depth. Of the values for cohesion for the three species, the cohesion for the combination I is 32.62 kPa, greater than that of the other two combinations by 15.3 % and 57.7%, respectively, suggesting the excellent capacity in reinforcing soil. The results may provide a theoretical basis for the prevention and control of the alpine grassland degradation, soil erosion, shallow landslides and other geo-hazards and eco-hazards along the Qinghai-Tibet railway, and are of a practical guiding significance for ecological restoration by planting vegetation along the railway.
- Qinghai-Tibet railway /
- artificial restoration of grassland /
- tensile strength of single plant root /
- root-soil composite system /
- shear strength

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References

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