大花序桉种源间木材物理性质变异研究

以广西东门林场18年生的11个大花序桉(Eucalyptus cloeziana)种源木材为研究对象,对它们的木材基本密度、弦向干缩率、径向干缩率等物理性质进行了测定分析,发现不同种源间、相同种源不同树干高度间所测定的物理性质指标均存在显著的差异。木材基本密度最大的种源是B85,然后依次是D47、B82,其值分别是0.7530、0.7386、0.7274 g/cm3;参试的11个种源中有8个种源的差异干缩都小于1.5,属于差异干缩小的类型;只有14425、12195和B55这3个种源的差异干缩超过1.5,但小于1.6,属于差异干缩中等类型;种源的树高、胸径生长性状与木材基本密度、差异干缩、体积全干缩率物理性状相关关系不密切,据此分别对树高、胸径等生长性状和木材基本密度、干缩率等木材物理性状进行独立选择可望获得较好的生长、物理性状改良效果。

Research on Wood Physical Property Variation Among Provenances of E.cloeziana

Woods of 11 E.cloeziana provenances aged 18 in Dongmen Forest Farm of Guangxi were taken as research objects,and such physical properties as basic density,tangential dry shrinkage and radial dry shrinkage were tested and analyzed.It has been found that physical property indicators among different provenances or different stem heights within the same provenance displayed obvious variation.The largest basic density was with provenance B85,followed by D47 and B82 with the respective value of 0.7530 g/cm3,0.7386 g/cm3 and 0.7274 g/cm3.Among the 11 tested provenances,there were 8 provenances whose ratio of tangential shrinkages to radial shrinkages was less than 1.5,belonging to the type of small difference shrinkage.Only such 3 provenances as 14425,12195 and B55 were with the ratio larger than 1.5 but smaller than 1.6,belonging to the type of medium difference shrinkage.Growth properties such as tree heights and DBH were not closely related to such physical properties as wood basic density,difference shrinkage and volume shrinkage rate.Based on this,independent selection of growth properties and physical properties were expected to generate improved effects.