南京林业大学学报（自然科学版）2025，Vol.49Issue(3)：181-189,9.DOI:10.12302/j.issn.1000-2006.202404028
火棘与紫穗槐根表皮特征对根系拉拔摩擦力的影响
Effect of Pyracantha fortuneana and Amorpha fruticosa root epidermis on root pulling friction
摘要
Abstract
[Objective]The epidermal morphology of plant roots critically determines their anti-pullout performance through root-soil interface friction modulation.Elucidating how root bark topography influences pullout resistance is fundamental for understanding vegetation-mediated slope stabilization mechanisms.[Method]Using Pyracantha fortuneana and Amorpha fruticosa as model slope-protection shrubs,we conducted single-root pullout tests to quantify frictional resistance.Fractal dimension(D)and contour arithmetic mean roughness(Ra)parameters were utilized to characterize root epidermis morphology,with subsequent correlation analysis between these descriptors and pulling resistance.[Result]P. fortuneana demonstrated significantly higher pullout resistance than A. fruticosa.The pulling resistance of P. fortuneana increased progressively with root diameter,whereas A. fruticosa exhibited no significant correlation between pulling resistance increment and root diameter,except for the highest resistance increase observed within the(3,4]mm diameter range.Microscopic analysis revealed distinct root bark morphologies:P. fortuneana displayed prominent undulating contours,while A. fruticosa maintained a relatively smooth surface.The morphological parameters Ra and D effectively characterized epidermal features.For P. fortuneana,fissured root bark morphology was optimally quantified by Ra values,which showed a strong positive correlation with pullout resistance-higher Ra values corresponded to greater resistance.In contrast,A. fruticosa's serrated root bark morphology was best described by D values,with pullout resistance increment demonstrating a strong positive correlation with increasingD. Mechanistic divergence was evident:P. fortuneana generated resistance through a particle-embedded friction mechanism,while A. fruticosa relied on direct root-soil interface contact.The interlocked soil particles within P. fortuneana's root bark contributed substantially to enhanced frictional resistance during pullout processes.[Conclusion]This study establishes quantitative relationships between root epidermal morphology and pullout resistance mechanisms,providing critical insights for optimizing slope-protection species selection based on root-surface architectural features.关键词
拉拔摩擦力/根皮微观特征/轮廓算术平均偏差/分形维数Key words
pulling friction/root bark microscopic character/contour arithmetic mean deviation(Ra)/the fractal dimension分类
农业科技引用本文复制引用
王子杰,郭欢,唐丽霞,吴文丽,廖拉拉..火棘与紫穗槐根表皮特征对根系拉拔摩擦力的影响[J].南京林业大学学报（自然科学版）,2025,49(3):181-189,9.基金项目
国家自然科学基金项目(31960332). （31960332）
