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[1]Zhihui,Gerile,Lu Yahui,et al.Research on shear characteristics and influencing factors of Hippophae Rhamnoides root-soil composites[J].Research of Soil and Water Conservation,2025,32(06):184-191.[doi:10.13869/j.cnki.rswc.2025.06.014]

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Research on shear characteristics and influencing factors of Hippophae Rhamnoides root-soil composites

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 32 Number of periods: 2025 06 Page number: 184-191 Column: Public date: 2025-10-20

Title:: Research on shear characteristics and influencing factors of Hippophae Rhamnoides root-soil composites

Author(s):: Zhihui,Gerile,Lu Yahui,Tian Jinlan,Shao Jie; (College of Desert Control Science and Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China)

Keywords:: Hippophae rhamnoides; root system; distribution characteristics; root-soil composite; cohesion

CLC:: S157.4

DOI:: 10.13869/j.cnki.rswc.2025.06.014

Abstract:: [Objective] To improve the biomechanical database of soil stabilization and erosion resistance by plants in arid and semi-arid regions, and to provide references for revealing their biomechanical response mechanisms. [Methods] First, the morphological and quantitative distribution indicators of 3-year-old Hippophae rhamnoides were analyzed by measuring root number, length, surface area and volume to reveal their distribution characteristics. On this basis, laboratory controlled direct shear tests were conducted on root-soil composites to investigate the variation patterns of shear strength and its related indicators under gradient changes in root number (2, 4, 6, and 10 roots). [Results] Hippophae rhamnoides roots with diameters ≤2 mm accounted for 72.86%, 71%, 76%, and 47% of the total root number, length, surface area, and volume, respectively, indicating a distribution pattern dominated by fine roots. This facilitated efficient nutrient and water uptake efficiency, which explained Hippophae rhamnoides's adaptability to arid and infertile environments. The direct shear tests revealed that in the root-concentrated soil layers, the shear strength of Hippophae rhamnoides root-soil composites increased by 35% and the cohesion increased by 27.55% compared to plain soil. The variations in cohesion and shear strength of root-soil composites showed consistency, whereas the internal friction angle exhibited an opposite pattern, which indicated that cohesion was the primary contributor to the improved shear strength of rootsoil composites. The shear strength and cohesion of Hippophae rhamnoides root-soil composites showed consistent variation trends with increasing root numbers, both following an initial increase followed by a decrease, and peaking at 4 roots. [Conclusion] The root system of 3-year-old Hippophae rhamnoides is dominated by fine roots, whose vigorous biological activity enhances root-soil interactions. Through mechanisms such as fine root network cementation and entanglement, the root-soil composites achieve higher shear strength, thereby improving soil stability and erosion resistance.

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Last Update: 2025-12-10