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›› 1986, Vol. 22 ›› Issue (3): 260-269.

• 论文及研究报告 • 上一篇    下一篇

黄花落叶松木材超微结构及其对渗透性的影响

周崟 姜笑梅   

  1. 中国林业科学研究院木材工业研究所
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:1986-08-25 发布日期:1986-08-25

ULTRASTRUCTURE AND ITS EFFECTS ON THE PERMEABILITY OF THE WOOD OF LARIX OLGENSIS HENRY

Zhou Yin,Jiang Xiaomei   

  1. Institute of Wood Industry, Chinese Academy of Forestry
  • Received:1900-01-01 Revised:1900-01-01 Online:1986-08-25 Published:1986-08-25

摘要: 本文详细地介绍了黄花落叶松木材超微结构特征及其对木材渗透性的影响,心材和边材管胞具缘纹孔的超微结构及其在不同部位和不同处理方法中的变化;晚材管胞具缘纹孔超微结构的变化;细胞壁各层次中的微纤丝及其周围的基质和结壳物质等的渗入或沉积性状。同时还针对黄花落叶松木材渗透性差,及一些晚材具缘纹孔少闭塞或不闭塞的原因,从木材的超微结构特点进行了较详细的探讨。

Abstract: Through this paper and the pictures, the main results are showed as follows: 1. Membrane of bordered pit in earlywood tracheid is a typical Pinus structural type; 2. Bordered pits in sapwood are deposited by very little amorphous substances so that their fine structure is clear, most of them are aspirated, most tori are dished inward over the aperture; the bordered pit membranes in sapwood that is close to the boundary of heartwood become so thick that dish impressions are decrease. Bordered pits and pit membranes are deposited by the abundent matrix, encrustations and extraetives in the heartwood, so the completely incrusted membranes are formed and the passage between cells may be blocked. These may be the main factor of low permeability in larch wood; 3. This study reports that some thin or non-cellulosic film substances are deposited on the surface of pit borders, pit membrances and tracheid lumens, that may affect strongly the permeability of wood; 4. The ultrastructure of bordered pits in latewood is very different from that in earlywood sapwood. These bordered pits are small, the tori are thicker and bigger, the diameter of microfibrillar strands of margo in latewood (maxi. up to 3960(?), aver. 1839(?) and 2340(?)) is thicker and wider than that in earlywood (aver. 733(?)), these thick microfibrillar strands consist of several to many microfibrils and are covered by some amorphous substances, the shape of the bordered pit membrane openings in latewood is different from those in earlywood. These may cause the increase in the rigidity of pit membranes and the bordered pits to be unaspirated completely or aspirated partially; 5. The abundent matrix, encrustations and extractives are deposited or penetrated in the different layers of cell wall and around the microfibrils. These substances must block the fine structure and affect the nature of microcapillaries, that may be another main factor of the low permeability in larch wood; 6. This study indicates that the width or distance between microfibrils of the S3 and S1 layers is larger than that in S2, the denseness of S3 and S1 is lower, the porosity is higher, especially the S1 layer is clearer.