【摘要】 <正> 前言山杨(Populus Dividiana Dode)小径木是黑龙江省尚志具帽儿山次生林区主要的间伐树种之一。该树种在干燥时易产生皱缩等缺陷,我们设想与其结构有关,故利用扫描电镜观察其超微结构,以期洞悉其中的奥秘。 W.R.Perng研究颤杨(Populus tremuloides)解剖构造与液体传导的关系,在电镜下观察时,指出颤杨心材中存在侵填体,这些侵填体使导管闭塞,因而液体流动困难。他又对此木材进行聚合物渗透,而心材导管中几乎无聚合物沉积,说明心材导管全部被侵填体堵塞,聚合物难以在心材沉积。更多还原

【Abstract】 The ultrastructure of the wood from the thinned Populus dividiana trees was studied by means of seanning electronmicroscope. Occurrence of tylosis was found with less amount in heartwood as well as in the transitional zone boundary from sapwood to heartwood. This might be one of the major causes of collapse in the process of wood drying. The anatomical features of collapsed cells and the ultrastructure variance after steaming were also studied in order to justify that collapse could be eliminated by steaming treatment.更多还原