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本文初步研究粤北乐昌大源林区近30年生馬尾松两个变型——“油松”和“糠松”的木材构造和物理力学性貭。依照木材解剖特征,将两个变型区别如次:油松的輪寬較大,晚材率較小,管胞壁厚稍小而腔闊稍大,管胞长度較短,木射线略多与径向树脂道較多,此外軸向管胞切向壁上具緣紋孔数目較少,射线管胞內壁鋸齿发育程度較浅,交叉場紋孔数目略多;糠松則相反。两者的主要差异为輪寬与管胞长度。油松与糠松两者的木材物理力学性貭,仅順紋拉力和順紋剪力有可靠的差异。此外,后者具有稍高的强度指标、貭量系数以及較大的树高生长。又粤北馬尾松木材的貭量系数,远胜他地同种松木,其主要力学指标較高,生长較快。
In this paper, we first studied the wood structure and physical mechanics of two major types of Pinus massoniana, Pinus tabulaeformis and Pinus thunbergii, grown in the past 30 years in Dayuan, Lechang, Guangdong Province. In accordance with the anatomical characteristics of wood, the two variants are as follows: pine larger pulley width, late wood rate is smaller, tubular wall thickness slightly smaller and larger chamber width, shorter tracheids, wood ray slightly more Radial resin road more, in addition to the axial tracheid tangential wall with a smaller number of marginal pits, ray tracheids wall sawtooth shallow degree of development, the number of cross-field pits slightly more; branded pine is the opposite. The main difference between the two is wheel width and tracheid length. The physical and mechanical properties of both pine and branded wood 貭, there is a reliable difference between the straight and parallel grain shear. In addition, the latter has a slightly higher intensity index, a higher coefficient of mass, and a greater tree height growth. The mass index of masson pine in northern Guangdong is much better than that of the same species of pine in northern China. The main mechanical indexes are higher and grow faster.