摘要
本文既对毛白杨的宏观特征进行了详细地描述和研究,同时也利用扫描电镜对一些微观特征:叶背面气孔、角度层和毛的密度进行了研究,从以上两方面特征中,选取了45个性状,利用系统聚类对18个样本(类型)归类,从而把毛白杨划分为非皱折毛白杨类和皱折毛白杨类,并统一使用了自然变型这一分类等级,这将消除毛白杨种下分类等级的混乱,为毛白杨的良种选育提供依据。
Not only have the macrocharacters of Populus tomentosa Carr. been described and studied in detail, but also its microcharacters with scanning electronic microscope. The microcharacters include stoma,cuticular layer,density of hair on leaf backs. Forty-five characters which belong to the macrocharacter or microcharacter groups were selected, the eighteen units(type) were classified by the method of cluster analysis, so that the types of Populus tomentosa Cart. can be divided into two kinds .the non rugose and the rugose,The grade of 'forma' was used in order to eliminate chaos on the grade of classification of Populus tomentosa Cart. supra species. The paper provides basis for selecting and raising of improved variety about Populus tomentosa Cart.
关键词
毛白杨
形态
类型
聚类分析
Populus tomentosa Carr., Morphology, Type, Cluster Analysis
