根系固土主要力学因子的主成分分析  

PRINCIPAL COMPONENT ANALYSIS ABOUT THE MAIN MECHANICAL FACTORS OF SOIL-REINFORCEMENT BY ROOTS

作　　者：格日乐[1] 刘艳琦[1] 左志严 乌仁图雅[1] 王祯仪 

机构地区：[1]内蒙古农业大学生态环境学院,呼和浩特010019

出　　处：《内蒙古农业大学学报（自然科学版）》2015年第6期39-47,共9页Journal of Inner Mongolia Agricultural University(Natural Science Edition)

基　　金：国家自然科学基金项目(41161046)

摘　　要：为了揭示根系固土的主导力学因素,本文在对内蒙古中西部6种乡土植物柠条(Caragana microphylla Lam.)、沙棘(Hippophae rhamnoides Linn.)、杨柴(Hedysarum mongolicum Turez.)、沙打旺(Astragalus adsurgens Pall.)、紫花苜蓿(Medicago sativa L.)和草木樨(Melilotus officinalis L.)等根系固土生物力学特性研究的基础上,选择春季土壤干旱时期土壤孔隙水不承压和夏季暴雨后土壤含水率很高土壤孔隙水承压两种自然条件下,从根系抗拉力学特性、根-土复合体抗剪特性以及根-土界面摩阻特性因素中选出10个指标变量进行主成分分析。结果表明:夏季暴雨后影响根系固土主导力学因子重要程度排序首先是根-土界面摩阻特性、其次是根-土复合体抗剪特性,最后是植物根系抗拉力学特性;春季土壤干旱时期影响根系固土主导力学因子首先是根-土界面摩阻特性、其次是植物根系抗拉力学特性,最后是根-土复合体抗剪特性。即自然条件不同则影响根系固土主导力学因素重要程度的排序不同。In order to reveal the leading mechanical factors of root solid soil,on the basis of research on the biomechanical properties about soil- reinforcement by roots,with 6 kinds of native plants in central and western Inner Mongolia,such as Caragana microphylla Lam. 、Hippophae rhamnoides Linn、Hedysarum mongolicum Turez、Melilotus officinalis L. 、Medicago sativa L. and Astragalus adsurgens Pall. We chosed two natural conditions are soil pore was pressured during the drought in the spring and after heavy rains in summer with high soil moisture soil pore water pressure. We selected 10 index to conduct variable principal component analysis from tensile properties of root system、shear characteristics of root soil composite and friction characteristics of root soil interface. The result show us that after the summer storms,the most imoprtant effect to mechanics dominant factor of Soil- reinforcement by roots is friction characteristics of root soil interface,the secondly is shear characteristics of root soil composite,and finally is tensile properties of root system; the mainly effect for mechanics dominant factor of Soil- reinforcement by roots when spring soil was in times of drought is friction characteristics of root soil interface,next is tensile properties of root system,and finally is shear characteristics of root soil composite.

关 键 词：根系固土 主导力学因子 主成分分析 

分 类 号：S714.7[农业科学—林学]