根土复合体力学效应及其模型构建研究进展与展望
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1.云南农业大学水利学院;2.云南水务投资股份有限公司;3.云南农业大学资环与环境学院

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国家自然科学基金项目(32160304);自然资源部“西南多样性区域土地优化配置与生态整治科技创新团队”开放基金项目(YNTD2018KF05);云南省基础研究计划面上项目(202201AT070272);云南省农业基础研究联合专项面上项目(202301BD070001-033;202301BD070001-103);云南省科技厅计划项目青年项目(2019FD094);云南省水利科技重大专项(2023BG204001)


Research progress and prospect of mechanical effects and model construction of root-soil complex
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Yunnan Agricultural University Water Conservancy College

Fund Project:

National Natural Science Foundation Project (32160304); Open fund project of "Science and Technology Innovation Team for Optimal Land Allocation and Ecological Renovation in Southwest Diversified Regions" of the Ministry of Natural Resources (YTD 2018 KF05); General Project of Yunnan Basic Research Plan (202201 at 070272); Yunnan Province Agricultural Basic Research Joint Special General Project (202301BD070001-033;; 202301BD070001-103); Youth Project (2019FD 094), a planned project of Yunnan Science and Technology Department; Major Project of Water Conservancy Science and Technology in Yunnan Province (2023BG204001)

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    摘要:

    植物根系和土体的自身特性以及相互作用是生态护坡的关键。该文采用文献分析法和对比分析法,归纳分析根土复合体概念和内涵、根土复合体力学效应及力学模型的原理、优缺点以及适用范围。研究结果表明:(1)根土复合体是基于根土之间力学耦合效应关系下的一个复合稳定整体,根系在土体中交叉缠绕,起到类似纤维的加固作用;(2)根土之间力学关系实质上是根土复合体土力、水力和复合力学特性相互作用的一个结果,土力特性侧重于研究植物根系特征对土体的影响,水力特性侧重于研究土体中水分运动以及持水能力对土体结构、土体理化性质和根系特征的影响,复合特性侧重于通过土体自身特性对植物根系特征以及结构有直接影响,从而通过三者的相互作用使根系与土体的力学关系处于动态平衡之中;(3)根土复合体复合力学模型的研究较土力和水力学模型略少,土力学模型侧重于通过试验和公式来研究根系与土壤特性之间的关系以此来量化根系的增强,而水力特性模型则是通过数值模拟来量化水力特性参数,两者都是根据参数间的对比来衡量固土效果。但复合力学同时涉及土力特性和水力特性,考虑全面,应是未来重点研究的方向。今后在开展冻融循环、干湿交替、干热循环对不同地区根土相互作用的影响、多类型植物混种抗剪强度、化学作用和微生物作用对土水特性影响机理及复合模型构建等方面有待深入研究。该文可为生态脆弱区的植被恢复、水土保持和可持续发展等提供重要的理论价值和工程借鉴意义。

    Abstract:

    The characteristics and interaction between plant roots and soil are the key to ecological slope protection. In this paper, the concept and connotation of root-soil complex, the mechanical effect of root-soil complex and the principle, advantages and disadvantages and application scope of mechanical model are summarized and analyzed by literature analysis and comparative analysis. The results show that the root-soil complex is a complex and stable whole based on the coupling relationship of mechanical effects between roots and soil, and the roots are intertwined in the soil, which plays a similar role in strengthening fibers. The mechanical relationship between root and soil is essentially a result of the interaction of soil force, hydraulic force and composite mechanical characteristics of root-soil complex. The soil force characteristics focus on the influence of plant root characteristics on soil, the hydraulic characteristics focus on the influence of water movement and water holding capacity in soil on soil structure, soil physical and chemical properties and root characteristics, and the composite characteristics focus on the direct influence of soil characteristics on plant root characteristics and structure, so that the mechanical relationship between root and soil is in a dynamic balance through the interaction of the three. The research on the composite mechanical model of root-soil complex is slightly less than that of soil force and hydraulic model. The soil mechanical model focuses on the relationship between roots and soil characteristics through experiments and formulas to quantify the reinforcement of roots, while the hydraulic characteristic model quantifies the hydraulic characteristic parameters through numerical simulation, both of which measure the soil consolidation effect according to the comparison between parameters. However, composite mechanics involves both soil and hydraulic characteristics, so it should be the key research direction in the future. In the future, the effects of freeze-thaw cycle, dry-wet alternation and dry-hot cycle on root-soil interaction in different regions, the shear strength of multi-type plant mixtures, the influence mechanism of chemical and microbial effects on soil-water characteristics and the construction of composite models need to be further studied. This paper can provide important theoretical value and engineering reference for vegetation restoration, soil and water conservation and sustainable development in ecologically fragile areas.

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  • 收稿日期:2023-05-06
  • 最后修改日期:2023-06-20
  • 录用日期:2023-06-25
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