杉木和马尾松木材渗透性与微细结构的关系研究

对杉木和马尾松心材与边材、溶剂置换干燥木材与普通气干木材的纵向气体渗透性与微细结构进行测定 ,来研究它们的渗透性与微细结构的关系 .结果表明 ,杉木和马尾松边材渗透性比心材高 ,与前者的纹孔膜有效流体渗透微孔数比后者多、管胞长度比后者长、管胞搭接率比后者低、管胞流体有效渗透长度比后者长有关 .溶剂置换干燥木材渗透性高于普通气干木材 ,是因为前者纹孔闭塞率低 ,每个管胞开放纹孔数、单位面积开放纹孔数、纹孔膜有效流体渗透微孔数比后者多 .

Relationship between permeability and fine structure of common Chinese fir and masson pine wood

The permeability and the fine structure of heartwood and sapwood of the solvent exchange dried wood and the air dried wood were measured in order to study the relationship between the permeability and the structure. The results show that the permeability of sapwood of common Chinese fir(\%Cunninghamia lanceolata\%(Lamb.) Hook) and masson pine (\%Pinus massoniana \% Lamb.) is higher than that of heartwood. It is attributed to the fact that the more the number of the effective pit openings of the sapwood is, the longer the tracheid length is, the lower the proportion of the overlapped tracheid is, and the effective permeability tracheid length is longer than that of the heartwood. The fact that the permeability of the solvent exhcnage dried wood is higher than that of the air dried, is attributed to the fact that the number of the unaspirated pit per tracheid, the unaspirated pit per unit area, the effective pit openings of the solvent exchange wood are more and the proportion of aspirated pits is lower than that of the air dried wood respectively.