关键词: 柳杉, 厚朴, 桤木, 楠竹, 抗拉力, 抗拉强度, 应力-应变关系, 北川县

Abstract: [Objective] The aim of the study was to measure root tension resistance of four trees (Cryptomeria fortunei,Magnolia officinalis,Alnus cremastogyne and Phyllostachys pubescens)in Beichuan county. [Method] The tensile properties including single root tensile strength,ultimate tensile strength and stress-strain relationship were investigated using field investigation and laboratory analysis. [Results] Single maximum tensile strength of each species increased with root diameter.The order of single maximum tensile strength within the same diameter was Cryptomeria fortunei > Magnolia officinalis > Alnus cremastogyne > Phyllostachys pubescens.Additionally,the order of single maximum tensile force of cedar forests was 9 a > 6 a > 3 a. [Conclusion] The order of single root tensile strength of four trees was Cryptomeria fortunei > Alnus cremastogyne > Magnolia officinalis > Phyllostachys pubescens.The maximum tensile strength of cedar forests increased with increasing stand age.

Key words: Cryptomeria fortunei, Magnolia officinalis, Alnus cremastogyne, Phyllostachys pubescens, tensile force, tensile strength, stress-strain relationship, Beichuan county