利用 X 射线 CT 扫描量化带有草本植物根系的细粒土壤在冻融条件下的剪切行为

IF 6.1 1区 农林科学 Q1 SOIL SCIENCE
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引用次数: 0

摘要

本研究以日本北海道地区为重点,调查了肯塔基蓝草根在冻融条件下对边坡土壤的加固作用。通过直接剪切试验和 X 射线 CT 扫描,我们分析了根系参数(如根系质量和体积)对根系-土壤复合材料剪切强度的影响。结果表明,与非冻融条件相比,冻融循环不会导致根系明显断裂,也不会削弱根系稳定土壤的能力。根系-土壤样本在剪切变形过程中表现出明显的延展性,剪切应力在达到峰值后继续增加。相比之下,土壤样本在达到剪切应力峰值后会趋于稳定,不会继续增加。虽然在剪切初始阶段,根土样本和土壤样本的剪切行为没有明显差异,但冻融循环导致根土样本出现一定程度的固结,从而降低了它们对弹性变形的抵抗力。此外,根系生长时间越长,剪切应力增加越明显。通过 CT 扫描图像重建,我们可以量化根系参数,如根的体积和在剪切面附近的分布,这些参数与最大剪切应力有很强的相关性。我们的研究结果证明了草本植物根系,尤其是肯塔基蓝草,在冻融条件下保持土壤稳定性的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Quantifying the shear behavior of fine-grained soil with herbaceous plant roots under freeze-thaw conditions using X-ray CT scan
This study investigates the reinforcement effect of Kentucky bluegrass roots on slope soil under freeze-thaw conditions, with a focus on the Hokkaido region of Japan. Using direct shear tests combined with X-ray CT scanning, we analyzed the impact of root parameters (such as root mass and volume) on the shear strength of root-soil composites. The results revealed that freeze-thaw cycle did not cause significant root breakage or diminish the root system's ability to stabilize the soil compared to non-freeze-thaw conditions. Root-soil samples demonstrated notable ductility during shear deformation, with shear stress continuing to increase after reaching peak values. In contrast, soil samples stabilized after reaching peak shear stress without further increase. Although no significant differences in shear behavior were observed between root-soil and soil samples in the initial shearing stage, the freeze-thaw cycle led to some consolidation in root-soil samples, reducing their resistance to elastic deformation. Moreover, longer root growth periods resulted in a more pronounced increase in shear stress. CT scan image reconstruction allowed us to quantify root system parameters, such as root volume and distribution near the shear plane, which showed a strong correlation with maximum shear stress. Our findings demonstrate the effectiveness of herbaceous plant roots, particularly Kentucky bluegrass, in maintaining soil stability under freeze-thaw conditions.
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来源期刊
Soil & Tillage Research
Soil & Tillage Research 农林科学-土壤科学
CiteScore
13.00
自引率
6.20%
发文量
266
审稿时长
5 months
期刊介绍: Soil & Tillage Research examines the physical, chemical and biological changes in the soil caused by tillage and field traffic. Manuscripts will be considered on aspects of soil science, physics, technology, mechanization and applied engineering for a sustainable balance among productivity, environmental quality and profitability. The following are examples of suitable topics within the scope of the journal of Soil and Tillage Research: The agricultural and biosystems engineering associated with tillage (including no-tillage, reduced-tillage and direct drilling), irrigation and drainage, crops and crop rotations, fertilization, rehabilitation of mine spoils and processes used to modify soils. Soil change effects on establishment and yield of crops, growth of plants and roots, structure and erosion of soil, cycling of carbon and nutrients, greenhouse gas emissions, leaching, runoff and other processes that affect environmental quality. Characterization or modeling of tillage and field traffic responses, soil, climate, or topographic effects, soil deformation processes, tillage tools, traction devices, energy requirements, economics, surface and subsurface water quality effects, tillage effects on weed, pest and disease control, and their interactions.
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