北川县4个树种根系抗拉特性研究  

Characteristics of Root Tension Resistance of Four Trees in Beichuan County

作　　者：孙丽文[1,2] 史常青[1,2] 赵廷宁[1,2] 宋恒川 高国雄[4] 陈丽华[1,2] 

机构地区：[1]水土保持与荒漠化防治教育部重点实验室,北京100083 [2]北京林业大学水土保持学院,北京100083 [3]广州市水务规划勘测设计研究院,广州510610 [4]西北农林科技大学,陕西杨凌712100

出　　处：《四川农业大学学报》2014年第1期34-40,58,共8页Journal of Sichuan Agricultural University

基　　金：国家林业公益性项目"四川地震灾区灾后植被恢复及可持续发展关键技术研究与示范"(201104109)

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。[Objective] The aim of the study was to measure root tension resistance of four trees （ Cryptomeria f ortunei , Magnolia o f f icinalis , Alnus crernastog yne and Ph yllostach ys pubescens） in Beichuan county. [Method] The tensile properties including single root tensile i strength, ultimate tensile strength and stress-strain relationship were investigated using field in- vestigation and laboratory analysis. [Results] Single maximum tensile strength of each species in- creased with root diameter. The order of single maximum tensile strength within the same diameter was Cryptomeria fortunei 〉Magnolia officinalis 〉 Alnus crernastogyne 〉 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 of ficinalis 〉 Phyllostachys pubescens. The maximum tensile strength of cedar forests increased with increasing stand age.

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 

分 类 号：S718.5[农业科学—林学] S727