黄土高原典型退耕树种刺槐根－土复合体力学效应机制

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关键词：刺槐；根系；根－土复合体；抗拉强度；根－土摩擦系数；黄土高原中图分类号：S157．2 文献标志码：A doi：10．3969 ／ j．issn．1000－1379．2025．06．018引用格式：，等．黄土高原典型退耕树种刺槐根－土复合体力学效应机制［J］．人民黄河，2025，47（6）：117－122．

Mechanisms Underlying the Mechanical Effects of Root⁃Soil Composites in Robinia Pseudoacacia：A Typical Afforestation Tree Species in the Loess Plateau

BAI Xulong1， YANG Aoqiu1， CHEN Zhuo1， DUAN Jingui1， ZHENG Ziteng1， SUN Yuxiang1， TIAN Kanliang1，2 （1．Institute of Soil and Water Conservation， Northwest A＆F University， Yangling ， China； 2．Institute of Soil and Water Conservation， Chinese Academy of Sciences and Ministry of Water Resources， Yangling ， China） Abstract： In order to reveal the reinforcement mechanisms of plant roots on loess slopes and provide a foundation for advancing theoretical re⁃ search and practical applications of vegetative slope protection in the Loess Plateau region， this study focused on Robinia pseudoacacia， a prominent afforestation species in the area． Through the tensile testing of Robinia pseudoacacia roots and root⁃pull experiments on root⁃soil composites， we analyzed the tensile properties of roots of varying diameters and the factors influencing the root⁃soil friction coefficients． The findings indicate that a） the tensile strength of Robinia pseudoacacia roots exhibits a positive correlation with root diameter， whereas both the longitudinal ultimate elongation and elastic modulus demonstrate a negative correlation with increasing root diameter． b） Soil dry density sig⁃ nificantly influences the root⁃soil friction coefficient， which increases as soil dry density rises． This phenomenon is attributed to the enhanced interlocking between roots and soil at higher densities． c） Conversely， the root⁃soil friction coefficient decreases with increasing soil moisture content， primarily due to the thickening of the water film on soil particles， which diminish the roughness and adhesive strength between the soil and roots． d） No significant relationship is observed between the root⁃soil friction coefficient and the thickness of roots of the same spe⁃ cies， likely because the surface roughness of roots across different diameters does not vary substantially．

Key words： Robinia pseudoacacia； root system； root⁃soil composite； tensile strength； root⁃soil friction coefficient； Loess Plateau

黄土高原土质疏松、水土流失严重、干旱缺水、生态环境脆弱，制约着经济社会尤其农业的可持续发展。（剩余8884字）