黑木相思木材物理性质株内变异研究  

Within-Tree Variation of Physical Properties of Acacia melanoxylon Wood

作　　者：周凡 付宗营 高鑫[1] 周永东[1] 江京辉[1] ZHOU Fan;FU Zong-ying;GAO Xin;ZHOU Yong-dong;JIANG Jing-hui(Research Institute ofWood Industry,Chinese Academy of Forestry,Beijing 100091,China)

机构地区：[1]中国林业科学研究院木材工业研究所,北京100091

出　　处：《木材科学与技术》2021年第2期30-36,共7页Chinese Journal of Wood Science and Technology

基　　金：中央级公益性科研院所基金项目“火力楠、黑木相思无性系高效培育和木材干燥技术”(CAFYBB2018ZB004)。

摘　　要：研究我国黑木相思木材主要物理性质的株内变异规律。结果表明:黑木相思木材各项物理性质在树干南北向差异不显著,径向差异均明显大于纵向差异,株内变异主要是径向差异引起。生材含水率自心材区到边材区递减,木材密度的径向变化趋势则基本相反。木材干缩和湿胀率自心材向边材递增;而差异干缩在外部心材处最大。木材吸湿平衡含水率的径向变化趋势与吸湿滞后系数相反。实际生产应考虑黑木相思木材物理性质株内径向差异,制定科学合理干燥工艺。The within-tree variation of wood physical properties was evaluated for Acacia melanoxylon grown in China.The results showed that the differences of various physical properties in north-south direction were not significant.The radial variation was significantly greater than the longitudinal variation,which was the most distinctive in terms of the within-tree variation of various physical properties.The green moisture content of wood decreased gradually from the heartwood part toward the sapwood part,while the radial changing trend of wood density was basically opposite.The shrinkage and swelling values of wood gradually increased from heartwood to sapwood in the radial direction.The ratio of the tangential shrinkage to the radial shrinkage reached the highest level at the heartwood part near the sapwood.The radial variation trend of the sorption hysteresis coefficient was opposite to the hygroscopic equilibrium moisture content variation.These within-tree variation of wood properties need to be considered accordingly and comprehensively,and a scientific drying schedule should be determined when processing Acacia melanoxylon wood to improve its utilization.

关 键 词：黑木相思 物理性质 径向变异 纵向变异 

分 类 号：S792.99[农业科学—林木遗传育种] S781[农业科学—林学]