白木香群体的表型多样性分析

采集广东、广西、海南和云南4个省9个居群的174个白木香样品,分别测量其10项形态性状,并进行方差、相关和聚类分析.文中还以欧式平均距离10为阈值,采用UPGMA法将白木香聚成了4组.方差分析表明,各性状在白木香居群间和居群内均存在广泛的变异性,居群间F值在6.520~13.867之间,而居群内F值在24.033~94.081之间.居群内平均方差分量为52.62%,说明居群内的变异是白木香表型变异的主要部分.白木香居群间的平均表型分化系数为33.38%,说明居群内的多样性程度大于居群间.多重比较还表明,白木香各居群间的变异系数和相对极差均无显著性差异.另外,各地理因子中,海拔对性状的影响较大,其次是年均气温和年降雨量.

Phenotypic Diversity of Different Aquilaria sinensis(Lour.)Spreng .Populations

174 samples of Aquilaria sinensis(Lour.) Spreng.in nine populations were collected from Guangdong,Guangxi,Hainan and Yunnan,China.Ten morphologic characteristics of these samples were then determined,and the corresponding variance,correlation and cluster analyses were carried out.By using a mean Euclidean distance coefficient of 10,Aquilaria sinensis(Lour.) Spreng.was finally clustered into four groups.The results of variance analysis show that there is significant difference in morphologic characteristics within or between the populations,and that the value of F is 6.520-13.867 between the populations and 24.033-94.081 within the populations,respectively.The mean variance portion within the populations,namely 52.62%,demonstrates that the variation within the populations is mainly due to the phenotypic variation.The mean phenotypic differentiation coefficient,namely 33.38%,means that the diversity within the populations is higher than that between the populations.The multiple comparisons indicate that there is no significant difference in the variance coefficient and the relative range between the populations.Moreover,it is found that,among all geographic factors,altitude is the most important factor that affects the morphologic characteristics,followed by the mean annual temperature and the annual precipitation.