草业学报2025，Vol.34Issue(4)：82-92,11.DOI:10.11686/cyxb2024188
紫花苜蓿根系构型和力学特征对生长时间的响应
Changes in Medicago sativa root system architecture and mechanical characteristics during the growing period
摘要
Abstract
The aim of this study was to explore the variations in root system architecture and mechanical characteristics of Medicago sativa plants in a purple soil area during the growing season after sowing.The whole root system was collected from M.sativa plants at 60,90,120 and 150 days after sowing,and the morphological and topological parameters were measured.The root pull-out strength and tensile strength were determined by pull-out resistance tests and single root tensile tests,respectively.It was found that:1)The total root length,total root surface area,total root volume,and number of root tips of M.sativa increased significantly during the growing period.The greatest increase in root length and largest increase in the number of root tips was between 90 d and 120 d,whereas the largest increases in root surface area and root volume were between 120 d and 150 d.The fractal dimension and fractal abundance of M.sativa roots were significantly higher,by 7.50％and 28.63％,respectively,at 150 d than at 60 d.2)There was a negative power function relationship between root pull-out/tensile strength and root diameter,and the root pull-out/tensile strength of roots of the same diameter increased initially and then decreased during the growing period,with the highest values at 90 d and the lowest values at 120 d.3)Correlation analyses showed that the soil water content was significantly positively correlated with the pull-out or tensile strength of M.sativa roots(P＜0.01),and the proportion of＞0.25 mm water-stable aggregates was negatively correlated with the average link length(P＜0.05).The results of a redundancy analysis showed that the fractal abundance and fractal dimension of roots contributed significantly to the pull-out or tensile strength of M.sativa roots(P＜0.05),with respective contributions of 75.1％and 13.6％.The results of this study provide a theoretical basis for the use of M.sativa to control soil erosion in purple soil areas and to predict its effectiveness in this role.关键词
水土流失/草本植物/根系形态/分形丰度/抗拉强度Key words
soil and water loss/herbaceous plants/root morphology/fractal abundance/tensile strength引用本文复制引用
王光沛,魏艳,谌芸..紫花苜蓿根系构型和力学特征对生长时间的响应[J].草业学报,2025,34(4):82-92,11.基金项目
国家自然科学基金项目(42377324),西南大学教育教学改革研究项目(2022JY074)和重庆市教委科学技术研究项目(KJQN202100218)资助. （42377324）
