摘要
观测了中国青冈属(Cyclobalanopsis Oersted)77个种近千份标本,选取包括叶柄、小枝、叶片、毛被、裂齿、坚果、壳斗等70个特征,应用因子分析和聚类分析的方法研究青冈属属下分类。因子分析借助主成分分析方法,从70个原始性状变量中筛选归纳出5个关键形态因子14个变量,并以此作为聚类分析的新变量,选取欧式距离系数和非加权平均数法(UPGMA)进行聚类。聚类分析和主成分分析的结果将国产青冈属划分为2个组5个亚组,与以前的形态分类吻合。因子分析结果表明:叶型、环带裂齿、壳斗毛被等性状对青冈属分类具有较重要的意义。还对青冈属2个大组和5个亚组之间的关系进行了探讨,并对用于分类的特征因子的可靠性进行了讨论。对青冈属一些有争议或存疑的种或变种(如青冈、龙迈青冈、长叶粉背青冈、黄枝青冈和滇青冈等)的关系也进行了讨论。
Based on 70 characters concerning aspects of leaf, petiole length, hairs, lateral veins and acorn of cupule from 1000 specimens of 77 taxa within the genus Cyclobalanopsis Oersted from China, a numerical taxonomy is presented by using the cluster analysis,principal components analysis （PCA） and factor analysis. 14 of 70 characters were screened by means of PCA and used for cluster analysis. The results showed that the genus could be divided into two sections and five subsections. The factor analysis indicated that the leaf shape, teeth ring and hairy cupule etc. were of significance for Cyclobalanopsis classification. According to the results of numerical taxonomy, the entity of some doubtful taxa such as C. glauca（ Thunb. ） Oerst. , C. lungmaiensis Hu, C. glaucoides Schott, C. fulviseriaca Y. C. Hsu et D. M. Wang, C. pseudoglauca Y. K. Li et X. M. Wang was re-examined, and the relationships of the two sections, and those of five subsections were discussed. The taxonomic reliability based only on the morphometric characters as well as the numerical methods were also reviewed.
出处
《武汉植物学研究》
CSCD
北大核心
2008年第5期466-475,共10页
Journal of Wuhan Botanical Research
基金
国家自然科学基金资助项目(39170059,39770062)
关键词
青冈属
数量分类学
性状
聚类分析
主成分分析
因子分析
Cyclobalanopsis Oersted
Numerical taxonomy
Characters
Cluster analysis
Principal components analysis
Factor analysis
