【摘要】 <正> 前言我国北方栽植杨树已有悠久的历史。种类较多,其中乡土树种毛白杨经近年鉴定,仍属优良品种之一,实际也是群众长期喜爱的。随着国家积极营造速生树种发挥其多种效益并开展综合利用,国内对毛白杨有关问题已进行了许多研究,但在树皮方面尚少较系统的报道。“树皮”不是一个技术性的名词,一般泛指木本植物干枝维管形成层以外的所有组织结构物质。在树木生长发育过程中,树皮承担着特有的生理功能,如营养运输、代谢转化、更多还原

【Abstract】 Developmental anatomy and chemical analysis including isolation and characterization of some important constituents in the bark of Populus tomentosa Carr.were investigated.The basic structure of tissues and cells produced from the primary and secondary growth of this bark was des- cribed.Attention was paid to the seqential changes of thses structures, initiation of the periderm,late-formed rhytidome and the retention of the cortical region,seasonal activity of secondary phloem,and the variable surface configuration of trunk,which were traced from those in the young shoot through the aging of matured trees,Successive extraction by neutral solv- ents,1% sodium hydroxide,cellulose and the individual sugars,“lignin”and its methoxyl content,formaldehyde reactive phenolic acid,etc.were determ- ined.Chlorophyll in the outer bark,two pure glucosides,a salicin and another not yet identified,five phenolic acids such as p-hydroxybenzoic acid,p-cure- eric acid,syringic acid,ferulic acid,and vanillic acid,were analysed by common methods,isolated and characterized by chromatography,infra-red absorption spectrum and high pressure liquid phase spectrum.Isoenzymes from the male and female tree bark were compared by electrophoresis.Besides this species studied,about six other species of Populus were compared in the concerned problems for reference.This report is a brief summary in nature for the accumulated studies carried on intermittently during the past decade. It may fill a gap in the study on growth and development of trees in Populus, and it may also be considered as a basic step towards the physiological or biochemical approch for the related problems,at least in static concept of the end products in a living tree.The results of this study would provide some basic information for the evaluation of the possible utilization of such barks. Discussion about this study and the related problems in bark research was made briefly.Some interest findings worthy for intensive study are carrying on.Further results will be presented elsewhere.更多还原