蓝桉、直干桉子测林木材纤维长度的变异

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0．05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。但以全部样本按树种分析，纤维长度与树高、胸径等生长性状都呈显著的正相关。

The Fiber Length Variation of Progeny Test Forest of Eucalyptus globulus and E. Maidenii

Selecting 3 families of Eucalyptus globulus and E. Maidenii respectively in the progeny test forest of Eucalyptus Seed Orchard, 32 trees have been sampled from each families in accordance with equal moment of diameter grade in black of different site cenditi ons. After analyzing, it is found that the fiber length variation shows within samples> within families>among families. The fiber length variation in diameter grade and arncaag families of Eucalyptus globulus both reach significant level (0.05), but that of E. Maidenii does not. The variation of two species among divisions does not get to significant level. The fiber length has significant correlation with growing characteristics in the better sites of site conditions, however, in inferior sites, the correlation is not very close. If were analyze all samples from the aspect of species, fiber length are related closely with height and breast height diameter.