中国栎属木材的构造及物理-力学性质(三)

WOOD STRUCTURES AND SOME PHYSICAL-MECHANICAL PROPERTIES OF FOUR CHINESE OAKS

介绍落叶栎属的小叶栎、黄山栎、北京榭栎和袍栎的木材解剖构造与材性的测试结果。四种栎木均属环孔材,心边材区分明显,薄壁细胞发达,具宽木射线,密度较大,强度指标高,属于高强度的木材。其中黄山栎、北京榭栎晚材管孔小,链状;袍栎和小叶栎晚材管孔为单孔,早晚材管孔的直径渐变,侵填体都较发达。除黄山栎以外,其它三树种有菱形结晶体,黄山栎的纤维细胞最长,袍栎的差异干缩大。

Anatomical structures and some physico-mechanical properties of wood from four Chinese oaks (Quercus aliena Blume var. pekingensis Schott., Quercus glandulifera Blume., Quercus chenii Nakai., and Quercus stewardii Rehd. ) are presented. All are ring-porous with distinct heart-wood, broad rays and well-developed wood parenchyma. Wood densities, mechanical strengths and coefficients of shrinkage are rather high. Among them the late wood of Q. chenii Nakai and 0. glandulifera Blume have solitary pores. The change in pore diameter from early wood to late wood is gradual and in their vessels are abundant tyloses. A lot of rhombus crystallities appear in Q. aliena Blume var. pekingensis Schott., Q. glandulifera Blume., and Q. chenii Nakai., Q. stewardii Rehd has the longest fiber. The difference between the tangential and the radial shrinkage of Q. glandulifera Blume is obvious.