尾巨桉树皮率及树皮纤维尺寸的变异研究

Study on the Variation of Tree Bark Deduction and Tree Bark Fiber Morphology of Eucalyptus urophylla×E.grandis

以广西贵港市平天山林场5年生、6年生和7年生的尾巨桉为对象,分析了不同树龄尾巨桉的树皮率和树皮纤维尺寸的株内变异特性。结果表明:尾巨桉的体积树皮率和重量树皮率均随着树干高度的增加而逐渐减小。树皮纤维长度随着树干高度的增加略有增加,但变化幅度不大;树皮纤维宽度、双壁厚度和壁腔比均随树干高度的增加而减小;树皮纤维长宽比则随树干高度的增加而增加。方差分析表明,不同树龄间尾巨桉树皮纤维长度和长宽比差异极显著,壁腔比差异不显著。

As 5 years old ,6 years old and 7 years old fast growing eucalyptus in Pingtianshan Forestry in Guigang, Guangxi for ob- jects, the within tree variation of bark deduction and bark fiber morphology of Eucalyptus urophylla × E. grandis with different ages were determined. The results showed that： with increase of,the tree bark volume rate and tree bark weight rate decreased. The fiber length of tree bark slightly increased as trunk height increases, but its change range was less. Its fiber width, double wall thickness and wall thickness lumen ratio declined while trunk height increases. The bark fiber increased with trunk height increasing. Analysis of variance showed that there were significant differences in length and length to width ratio of bark fiber Eucalyptus urophylla x E. grandis with different ages, and no obvious difference in wall thickness lumen ratio.