【摘要】 【目的】研究北川县几种常见造林树种(柳杉、厚朴、桤木和楠竹)的根系抗拉特性。【方法】通过野外调查和室内试验相结合的方法,研究了各树种单根的抗拉强度、最大抗拉力和应力-应变关系等抗拉特性。【结果】各树种单根的最大抗拉力随根径的增大而迅速增加,相同直径水平时单根最大抗拉力大小依次为柳杉>厚朴>桤木>楠竹;不同林龄的柳杉单根的最大抗拉力大小依次为9a>6a>3a。【结论】4个树种单根的抗拉强度为柳杉>桤木>厚朴>楠竹;不同林龄的柳杉单根的最大抗拉力随林龄增加而增加。更多还原

【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 9a>6a> 3a.【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.更多还原