[目的]有效评价和利用红锥Castanopsis hystrix 2代种子园资源、挖掘其优良性状.[方法]对广东省龙眼洞林场2代种子园内56个红锥无性系生长和形质性状进行调查,分析各性状的变异系数、不同性状间的相关关系,并进行主成分分析和聚类分析.[结果]56个红锥无性系的10个生长和形质性状的变异系数介于11％～47％,平均变异系数为28.2％.树高与胸径、冠幅与树高、胸径间呈极显著正相关,胸径与分枝数、分枝大小与叶片疏密间也存在极显著正相关,冠幅与分枝角度、尖削度与分枝大小存在显著的负相关.10个性状可以综合为3个主成分,前3个主成分累计贡献率达85％.根据系统聚类将56个红锥无性系划分为4个组.[结论]不同红锥无性系的生长性状和形质性状间变异系数较大,遗传多样性较丰富,且性状间存在不同程度的相关性,为开展红锥种内杂交育种的亲本选择奠定基础.%[Objective] To evaluate and utilize the resources in the second generation seed orchard of Castanopsis hystrix,and develop elite genotypes with genetic merit.[Method] We investigated the growth and form traits of 56 C.hystrix clones in the second generation seed orchard at Longyandong forest farm,Guangdong Province.The variation coefficients and correlations of different traits were analyzed.Principal component analysis and cluster analysis were performed.[Result] The variation coefficients of ten growth and form traits of 56 C.hystrix clones ranged from 11％ to 47％,and the average was 28.2％.Height and diameter at breast height,crown width and height,crown width and diameter at breast height,diameter at breast height and branch number,branch size and leaf density all had significant positive correlations(P＜0.01).Crown width and branch angle,taper degree and branch size had significant negative correlations(P＜0.05).Principal component analysis indicated that ten traits could be explained by the first three principal components,accounting for 85％ of cumulative proportion of variations.Based on hierarchical cluster analysis,56 clones were divided into four groups.[Conclusion] Growth and form traits among C.hystrix clones had extensive variation with rich genetic diversity.Different degrees of correlations are found among traits.This study provides a basis for parent selection in breeding intraspecific hybrid of C.hystrix.
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