鄂尔多斯高原乡土植物杨柴根系固土生物力学特性  

Biomechanical Properties of the Root System of Corethrodendron fruticosum var.mongolicum for Soil Stabilization on the Ordos Plateau

作　　者：田金兰 格日乐 卢亚慧 志辉 邵杰 Tian Jinlan;Gerile;Lu Yahui;Zhi Hui;Shao Jie(College of Desert Management,Inner Mongolia Agricultural University,Hohhot 010018,Inner Mongolia,China)

机构地区：[1]内蒙古农业大学沙漠治理学院,内蒙古呼和浩特010018

出　　处：《绿色科技》2025年第2期61-68,共8页Journal of Green Science and Technology

基　　金：内蒙古自然科学基金项目(编号:2021MS04011);内蒙古自治区教育厅关于“加强我国北方重要生态安全屏障建设”研究专项(编号:STAQZX202309);国家自然科学基金项目(编号:41867011);内蒙古自治区教育科学研究“十四五”规划专项课题(编号:2023NGHZX-LD165)。

摘　　要：探究2个生长时期鄂尔多斯高原乡土植物杨柴(Corethrodendron fruticosum var.mongolicum)根系固土生物力学特性。以鄂尔多斯高原库布齐沙漠3龄人工杨柴的根系为研究对象,进行生长初期和末期单根瞬时极限拉伸试验、根-土复合体的单根拉拔摩阻试验及其根系化学组分与单根抗拉强度关系的研究,揭示生长初期、末期杨柴根系固土生物力学特性及其对时间变化的响应,并探究其生物学内在机理。结果表明:根系抗拉力学性质在生长初期和末期与根径间存在显著的尺寸效应。根径在0~4.5 mm,单根极限抗拉力随直径增大呈幂函数增加。根径≤1.5 mm时,生长初期的抗拉力大于末期;根径>1.5 mm时,末期的抗拉力明显大于初期。单根极限抗拉强度随着直径增加呈逐渐减小趋势,根径≤1.5 mm时,初期强度大于末期;根径>1.5 mm时,末期强度高于初期。根径在0~4.5 mm,单根抗阻拉力随根径增长而增大,生长季末期的摩阻强度大于初期,细根的抗拉拔能力强于粗根。根径增粗时,纤维素含量减少,半纤维素和木质素含量增加,三者在不同生长时期的差异显著(P<0.01)。纤维素含量与单根抗拉强度相关性大于0.8,而与半纤维素和木质素含量负相关,相关系数的绝对值大于0.5。杨柴根系在生长季不同阶段表现出明显的时间尺寸效应,生长末期的根系抗拉强度和拉拔摩阻强度优于初期。纤维素含量对根系的抗拉强度起关键作用,根系化学组分的变化影响其生物力学特性。This paper aims to investigate the soil stabilization biomechanical properties of the roots of Corethrodendron fruticosum var.mongolicum in two different growth periods on the Ordos Plateau.Roots of 3-year-old Corethrodendron fruticosum var.mongolicum from the Kubuqi Desert on the Ordos Plateau were used as subjects.Single-root instantaneous tensile tests and root-soil composite single-root pullout resistance tests were conducted at the early and late growth stages,along with an analysis of root chemical components and their relationship with single-root tensile strength.This study aimed to reveal the soil stabilization biomechanical characteristics of Corethrodendron fruticosum var.mongolicum roots at different growth stages and their temporal responses,and to explore the underlying biological mechanisms.The results show that the tensile mechanical properties of the roots showed significant size effects between the early and late growth stages.For root diameters ranging from 0 to 4.5 mm,the ultimate tensile strength of single roots increased as a power function of diameter at both growth stages.When root diameters were≤1.5 mm,the tensile strength at the early stage was greater than at the late stage;when diameters were>1.5 mm,the tensile strength at the late stage was significantly greater than at the early stage.The ultimate tensile strength of single roots decreased with increasing diameter,with initial strength being greater than late stage strength for roots≤1.5 mm,and late stage strength being higher than initial strength for roots>1.5 mm.In the 0~4.5 mm diameter range,root pullout resistance increased with diameter,with late stage values being greater than early stage values,and finer roots having stronger pullout resistance than coarser roots.As roots thickened,cellulose content decreased while hemicellulose and lignin contents increased,with significant differences between growth stages(P<0.01).Cellulose content was highly correlated with single-root tensile strength(correlation>0.8),while negatively

关 键 词：杨柴 单根 生长时期 抗拉强度 纤维素 

分 类 号：S157[农业科学—土壤学]