Relation Between Dendrometric Variables and Growth Stress in Eucalyptus

ABSTRACT The objective of this study was to identify eucalyptus clones for the production of sawed timber based on dendrometric variables and longitudinal residual deformation (LRD), analyzing the correlation between these characteristics. 20 Eucalyptus grandis x Eucalyptus urophylla clones with 13 years of age were analyzed. The crown size, diameter at breast height (DBH) and bark thickness were measured. There was a significant difference between the clones for DBH, LRD and bark thickness. There was no significant correlation between DBH and DRL. The correlation was significant between DBH and crown size, its being possible to affirm that crown size affects the diametrical growth of trees. DBH and bark thickness were also significantly correlated, in so far as trees with a wider diameter possess thicker bark. It was possible to select clones with better potential for sawed timber production, that is to say, elevated DBH with a reduced LRD.

摘要 本研究旨在基于测树学指标与纵向残余变形（Longitudinal Residual Deformation, LRD）筛选适用于锯材生产的桉树无性系，并分析各性状间的相关性。本研究共对20个13年生的巨桉×尾叶桉（Eucalyptus grandis × Eucalyptus urophylla）杂交无性系开展分析，测定了冠幅、胸径（Diameter at Breast Height, DBH）及树皮厚度。结果显示，各无性系在胸径、纵向残余变形及树皮厚度上均存在显著差异。胸径与纵向残余变形之间无显著相关性。胸径与冠幅间呈显著正相关，由此可证实冠幅对树木直径生长存在影响；胸径与树皮厚度亦呈显著正相关，即直径越粗的树木其树皮厚度越厚。本研究可筛选出具备更优锯材生产潜力的无性系，即具备较高胸径且纵向残余变形较低的材料。