辽东栎木材解剖特征与物理-力学性质的关系

本文借助通径系数分析及主成分分析等统计方法,以五株产自山西中条山的辽东栎为试验材料,详细研究了木材解剖特征的内在关系以及解剖特征与物理—力学性质的关系。结果表明,“细胞特征”(纤维、导管尺寸及微纤丝角等)和“组织比量”(导管、纤维及薄壁组织比量)两个主因子基本反映并代表了木材的所有解剖特征,同时也是影响木材物理—力学性质的两个基本解剖因子。

RELATIONSHIP BETWEEN ANATOMICAL STRUCTURE AND PHYSICO-MECHANICAL PROPERTIES OF EAST-LIAONING OAK (Q.liotungensis)

The experiment was conducted with 5 trees (Quercus liotungensis) grown in the Zhong Tiao Mountains of Shan Xi Province as sample to study internal correlations between istinct anatomical characters and its correlations with physico--mechanical pro pertiesthrough path analysis, principal components analysis and regression analysis. Based on principal components analysis, all anatomical characters was reduced forthe first time to two comprehensive factors (or principal components) --"cell feature"fector (fiber length, fiber diameter, microfibril angle, radial and tangential diameters ofvessel etc.) and "tissue proportion" factor (fiber proportion, vessel proportion and par-enchyma tissue proportion ), which are actually reflection of the "quality" ("cellfeature "factor) and "quantity" ("tissue proportion" factor) of wood cells. Path ana-lysis indicated that the two factoros are, in effect, basic factors influencing wood phy-sico-mechanical properties. Tissue proportions determine the amount of cell wal substanes, hence wood density.But vessel proportion, among tissue proportions, is a dominant factor. The anatomical factors influencing wood shrinkage is much varied with the type ofshrinkages. For trans verse shrinkage (radial and tangential direction), fiber diameteris a dominant factor, and volumetric shrinkage is mainly influenced by tissue proportio-ns as well as microfibril angle; For differential shrinkage, microfibril angle turns outprimary and tissue proportions secondary. Wood tensile strength is directly correlated with microfibril angle and tissue propor-tions. And yet wood basic density is only a relative quantitative index of cell wall su-bstances. It, therefore, is not as good an indicator of tensile strength.