[1]Li Jiajing,Yang Jianying,Wang Xin,et al.Shear Strength of Typical Stand Root-soil Composites in Beichuan County[J].Research of Soil and Water Conservation,2024,31(05):93-101.[doi:10.13869/j.cnki.rswc.2024.05.001]
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Shear Strength of Typical Stand Root-soil Composites in Beichuan County
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
31
Number of periods:
2024 05
Page number:
93-101
Column:
Public date:
2024-08-10
- Title:
- Shear Strength of Typical Stand Root-soil Composites in Beichuan County
- CLC:
- S157; S718.5; S727
- DOI:
- 10.13869/j.cnki.rswc.2024.05.001
- Abstract:
- [Objective]The aims of this study are to explore the characteristics and disparities in shear strength of root-soil complexes in different forest stands, and to provide a theoretical basis for addressing local soil erosion issues more effectively. [Methods]This study focuses on Beichuan County, Sichuan Province. Direct shear tests were conducted on intact root-soil complexes of several typical forest stands in the area, measuring relevant indicators such as shear strength, soil properties, and root characteristics. Principal component analysis was utilized to analyze the influencing factors of shear strength. [Results](1)There were significant differences in shear strength among root-soil composites of different forest stands. The shear strength of 30-year-old Magnolia liliiflora forest(XY)was the highest, followed by Spotted bamboo Phyllostachys bambusoides forest(BZ), while the shear strength of 5-year-old Cryptomeria forest was the lowest.(2)The plant root system significantly contributed to soil stabilization, with an increase in shear strength of root-soil composites ranging from 0.13 kPa to 0.99 kPa, with an average increase of 350.0%. Additionally, the peak displacement, softening segment length, and residual shear strength of root-soil composites were enhanced, with average increases of 75.0%, 66.7%, and 262.5%, respectively. The total energy consumption of root-soil composites varied among different forest types but generally correlated with their shear strength.(3)Comprehensive analysis through principal component analysis revealed that, apart from soil bulk density and the dry and wet weights of 5～8 mm roots, all other indicators were closely related to shear strength. [Conclusion]Plant roots play a significant role in soil stabilization. The notable differences in shear strength of root-soil complexes were observed among different forest stands.
- References:
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Last Update:
2024-08-10