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Characteristics of Root Tension Resistance of Four Trees in Beichuan County

SUN Li-wen;SHI Chang-qing;ZHAO Ting-ning;SONG Heng-chuan;GAO Guo-xiong;CHEN Li-hua;Key Laboratory of Soil and Water Conservation and Desertification Combating,Ministry of Education;College of Soil and Water Conservation,Beijing Forest University;Guangdong Water Planning and Design Institute;Northwest A and F University;  
【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 9a6a 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.
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