青藏高原黄土区四种草本植物单根抗拉特性研究  

Tensile Characteristics of Single Root of 4-Type Herbs Grown in Loess Region of Qinghai-Tibet Plateauthe

作　　者：李成凯[1] 

机构地区：[1]青海大学,青海西宁810016

出　　处：《中国水土保持》2008年第5期33-35,共3页Soil and Water Conservation in China

基　　金：青海省重点科技攻关项目(2003-N-134)

摘　　要：为研究草本植物根系固土护坡的力学机理,对青藏高原西宁盆地黄土区的披碱草、细茎冰草、赖草、芨芨草4种草本植物进行了室内单根拉伸试验,分析了其单根抗拉特性。结果表明:生长2年的4种草本植物单根平均抗拉强度可达65MPa,单根抗拉力随根径的增大而增大;4种草本植物按单根抗拉强度大小排序为:芨芨草>细茎冰草>赖草>披碱草,单根抗拉强度与根径间呈幂函数或指数函数的关系,随根径增大而减小,表明草本植物须根对边坡表层防护具有重要的作用。It conducts indoor single root tensile tests on 4 kinds herbs of Elymus dahuricus、Agropyron trachycaulum、Leymus secalinus and Achnatherum splendens growing on the loess region of Xining Basin, Qinghai-Tibet Plateau and analyzes its characteristics of tensile resistance of single root for the purpose of studying the mechanics mechanism of soil-fixation and slope protection of herbs root system. The outcomes shown that the mean tensile strength of single roots of the 4 2-year grown herbs can reach 65 MPa and the tensile resistance of single root increases along with the increase of diameter and; the degree of tensile strength of the 4 herbs is as follows: Achnatherum splendensAgropyron trachycaulumLeymus secalinusElymus dahuricus, the tensile strength of single root is in the relationship with the power function or exponential function of root diameter and decreases along with the increase of diameter, showing the important function of hair roots of herbs to the surface protection of slopes.

关 键 词：单根 抗拉力 抗拉强度 边坡防护 青藏高原 

分 类 号：S688.4[农业科学—观赏园艺]