西北地区杨属的数量分类  

A NUMERICL TAXONOMY OF THE GENUS POPULUS FROM NORTHWESTERN CHINA

作　　者：陈振峰 曲式曾[2] 

机构地区：[1]商业部西安生漆研究所 [2]西北林学院

出　　处：《植物研究》1989年第4期115-129,共15页Bulletin of Botanical Research

摘　　要：本文应用聚类分析和主成分分析的方法对西北产的杨属29个种或种下分类单位进行了研究。聚类分析中选取了71个特征性状采用了相关系数基础的不加权算术平均配对法(UPGMA)法进行了运算。本文共观测了2576个样本(包括芽、短枝、叶片、雄花、蒴果)的各项特征。数量分类的结果将杨属划分为三个亚属及五个组。通过数量分析的方法,对一些有争议或有疑难的种或变种,如额河杨、河北杨、毛白杨……、小叶杨,进行了讨论。本文还对五个组之间的关系和仅根据营养器官特征分类的可靠性进行了探讨。最后对数量分析的方法也进行了讨论。A numerical taxonomic study of populus L. frnm northwestern China ispresented. 71 characters of 5276 samples (including bud, short twig, leaf,male flower and carpel)in 29 taxa within the genus were subjected to thecluster analysis and principal components analysis (PCA) methods. In clu-ster analysis, correlation coefficient secured from standardized data wasclustered by the unweighted pair-group method using arithmeric aweragelinkage (UPGMA). From the resulis presented the genus is divided intn 3subgenera and 5 sections which correspond well to the division pro osedby L. A. Dode in 1905. By the techniques of numerical taxonomy, somedoubted taxa such as P. jrtyschensis Ch. Y. Yang P. hopeiensis Hu et ChowP. tomentosa Carr., P. simonii Carr. ……are re-examined, the relationshipin the five sections and the taxonomio reliability based only on vegetativecharacters as well as the methods of numerical analysis are further disc-ussed.

关 键 词：杨属 数量分类 西北地区 

分 类 号：Q949.733[生物学—植物学]