浙江农林大学学报2017，Vol.34Issue(5)：849-855,7.DOI:10.11833/j.issn.2095-0756.2017.05.011
基于硬头黄竹材质变异分析的伐竹年龄判定
Logging age for the Bambusa rigida culm based on physical-mechanical properties
摘要
Abstract
To optimize the logging age of the Bambusa rigida culm, physical-mechanical properties of bamboo culms aged from 0.5 to 4.5 years were sampled by age with sample size of 10 for each age bamboo culm and e-valuated according to national standards from Testing Methods for Physical and Mechanical Properties of Bam-boos (GB/T 15780-1995) and the radial bending test method. Data from different bamboo ages were statisti-cally analyzed with ANOVA. Results showed that (1) the moisture content of green bamboo and volumetric shrinkage decreased with an increase in bamboo age from 0.5 to 4.5 years;whereas, the basic density increased overall. Also, (2) compression strength parallel to the grain, modulus of rupture (MOR), and modulus of elas-ticity (MOE) reached a maximum at 3.5 years of age, and shear strength parallel to the grain had already lev-eled off at this age. (3) From the base to the top portion of the bamboo culm, moisture content of the green bamboo and volumetric shrinkage decreased; whereas, the basic density, compression strength parallel to the grain, shear strength parallel to the grain, MOR, and MOE all increased. Noteworthy was that shear strength, MOR, and MOE decreased at the top portion of the bamboo at age 4.5, which reflected the aging phenomenon of bamboo culms. (4) The 3.5-year-old bamboo culms had a moisture content of green bamboo, 60.67%;basic density, 0.72 g·cm-3; volume shrinkage, 12.54%; compression strength parallel to the grain, 82.41 MPa; shear strength parallel to the grain, 11.99 MPa; MOR, 237.13 MPa; and MOE, 18.32 GPa. Comprehensively, a ma-tured 3.5-year-old Bambusa rigida culm was recommended as the optimal logging age. [Ch, 7 tab. 27 ref.]关键词
木材科学与技术/硬头黄竹/物理性质/力学性质/伐竹年龄Key words
wood science and technology/Bambusa rigida/physical properties/mechanical properties/logging age分类
农业科技引用本文复制引用
李凤,齐锦秋,肖辉,陈玉竹,谢九龙,黄兴彦..基于硬头黄竹材质变异分析的伐竹年龄判定[J].浙江农林大学学报,2017,34(5):849-855,7.基金项目
四川省教育厅高校木材工业与家具工程重点实验室资助项目 （）
