不同状态胡杨木材物理性质变化研究  

Wood Physical Property of Populus euphratica Timber with Differnent Status

作　　者：宁国艳 王喜明[1] 王哲[1] 

机构地区：[1]内蒙古农业大学材料科学与艺术设计学院,内蒙古呼和浩特010018

出　　处：《西北林学院学报》2017年第4期224-228,共5页Journal of Northwest Forestry University

基　　金：基金项目:内蒙古自治区科技创新团队-沙生灌木纤维化能源(202044);草原英才创新团队-沙生灌木纤维能源化开发(108061)

摘　　要：为了全面掌握不同状态胡杨木的物理特性变化规律,分析胡杨木强耐腐性的主要原因。以内蒙古额济纳胡杨保护区的胡杨活立木、伐倒木和枯倒木为研究对象,按照国家标准分别测定了不同状态胡杨木的密度、干缩性、吸湿性和尺寸稳定性,运用X-线衍射法表征胡杨木的纤维结晶度,并比较3种不同状态胡杨木的物理特性变化情况。结果表明,不同状态的胡杨气干密度、全干密度、弦向干缩率、径向干缩率、体积干缩率5项指标差异显著。随着木材伐倒时间的推移,木材密度和干缩率指标会逐渐下降。不同状态胡杨木的差异干缩系数、吸湿率、弦向湿胀率、径向湿胀率、体积湿胀率、结晶度等指标差异不显著。根据我国木材材性分级标准胡杨属轻等级别木材,尺寸稳定性较优。通过对不同状态胡杨的物理特性比较研究,得出胡杨的强耐腐性与其本身具有优良的物理特性密切相关。In order to fully understand the change rules of of Populus euphratica timber with different status and to analyze its strong decay resistance, living trees, felled trees, and decaying trees were sampled from the poplar protection zone in Ejina Banner of Inner Mongolia to measure the relative parameters,such as density,dry shrinkage,hygroscopicity,and dimensional stability based on the China national standards. X-ray diffraction was adopted to characterize wood fiber crystallinity. Physical properties of the woods with three different status were compared. The results showed that there were significant differences in air-dry density, absolute-dry density, tangential shrinkage rate, radial shrinkage rate, and volume shrinkage rate. As time went on, the density and dry shrinkage reduced. There were no obvious differences in shrinkage of tangential to radial, hygroscopicity, dimensional stability, and wood fiber crys material classification standard,P, euphratica belonged to light level wood ty. The strong decay resistance was closely related to its excellent physical tallinity. Based on China wood with great dimensional stabitiproperties.

关 键 词：胡杨木 物理性质 枯倒木 强耐腐性 

分 类 号：S781.3[农业科学—木材科学与技术]