尾叶桉材性指标在株内、株间和无性系间的变异性研究

Variation in Wood Properties of Eucalyptus urophylla——within a tree and between trees and clones

以8年生尾叶桉(Eucalyptus urophylla S.T.Blake)无性系林为试材,就材性指标在株内、株间和无性系之间变异进行了研究分析。结果表明:纤维长度、纤维宽度、纤维长宽比、管孔弦向直径、纤维双壁厚度和纤维壁腔比在树干水平方向上的不同部位具有极显著性差异,呈由内向外逐渐增大的规律;微纤丝角度、单位面积管孔数和纤维腔径比在树于水平方向上的不同部位亦具有极显著性差异,但呈由内向外逐渐减小的规律;而木材胞壁率、木纤维比量、导管比量、射线比量、轴向薄壁组织比量和木纤维胞腔直径在树干水平方向上没有显著性变异;主要材性指标在同一无性系内的植株之间无显著性差异,但在无性系之间的差异均达到显著或极显著性水平。

Variation of Wood properties within a tree and between trees and clones has been dis- cussed with Eucalyptus urophylla S. T. Blake of 8 - year - old as material. Results show that at differ- ent positions on the same level of tree stem, fiber length, fiber width, the ratio of fiber length to width, tangential diameter of pores, wall thickness of fibers, and the ratio of fiber thickness to lumen diameter have extremely significant differences, showing a increasing trend from pith to bark; fibril angle, number of pores on unit area, and the ratio of fiber lumen to total diameter also have extremely significant differ- ences, but showing here a decreasing trend from pith to bark; while cell - wall percentage, wood - fiber percentage, vessel percentage, wood- ray percentage, wood- parenchyma percentage and lumen diame- ter of fibers show no significant variation on the same level of tree stem; between trees of the same clone wood properties discussed have no significant difference, but they show significant or extremely significant differences between clones.