青钱柳天然群体种子性状表型多样性

以青钱柳分布区内的9个天然群体种子为试材，对种子千粒重、体积、直径、厚度和径厚比5个表型性状进行了系统的比较分析，采用方差分析、相关分析及聚类分析等方法对群体间和群体内的表型多样性进行探讨.结果表明: 青钱柳种子千粒重、体积、直径及厚度在群体间和群体内均达到显著或极显著差异，而种子径厚比仅在群体内存在极显著差异，说明青钱柳种子性状在2个层次上都具有丰富的多样性.各性状的平均表型分化系数（V）为20.54%，即群体间的变异远低于群体内的变异（79.46%）.种子性状与地理因子相关程度存在差别，且受年均气温的影响最大.利用群体间欧氏距离进行系统聚类分析，青钱柳群体可以划分为三类.

Phenotypic diversity of natural Cyclocarya paliurus populations seed traits

With the seeds from nine natural Cyclocarya paliurus populations as test materials,their phenotypic traits,including 1000-seed weight,seed size,seed diameter,seed thickness and seed diameter/thickness ratio,were investigated,and the phenotypic diversity among and within the populations were studied by the methods of ANOVA analysis,hierarchical cluster analysis,and correlation analvsis.Significant differences were observed in the 1000-seed weight,seed size,seed diameter,and seed thickness among and within the populations,and in the seed diameter/thickness ratio within the populatioas,illustrating that there existed high phenotypic diversity of seed traits at these two levels.The mean phenotypic differentiation coefficient(V)of test seed traits was 20.54%,i.e.,the variation among the populations was far smaller than that(79.46%)within the populations.The seed traits had different correlation degrees with geographical factors,and most affected bv mean annual air temperature.According to the hierarchical cluster analysis based on the Euclidean distance.the nine natural Cyclocarya paliurus populations could be classified into three groups.