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在桉树种子园的后代测定林内 ,从蓝桉和直干桉中各抽 3个家系 ,分别在立地条件不同的区组中按径阶等距抽样 ,每家系 32株。经分析发现 ,纤维长度的变异为 :样品内 >家系内 >家系间。蓝桉纤维长度差异在径级和家系间均达到 0 0 5水平 ,直干桉则不显著。区组间 ,两个树种的纤维长度差异都不显著。在立地条件好的区组中纤维长度与生长性状显著相关 ,立地条件差的区组却不密切。但以全部样木按树种分析 ,纤维长度与树高、胸径等生长性状都呈显著的正相关。
In the descendants of Eucalyptus seed orchard, three families were drawn from each of Eucalyptus and Eucalyptus urophylla, and 32 families were screened at different times and locations respectively. The analysis found that the variation of fiber length is: within the sample> within the family> between families. The differences of the length of blue eucalyptus fiber between the diameter class and the pedigree reached 0 0 5 level, while the direct eucalyptus did not show significant difference. There was no significant difference in fiber length between the two species. The fiber length and growth traits were significantly correlated in the well-site group, but the poorly-sited group was not close. However, all tree species by wood analysis, fiber length and tree height, diameter and other growth traits were significantly positive correlation.