Abstract
ABSTRACT The objective of this study was to characterize the formation of growth rings in Khaya ivorensis wood, as well as to analyze the variation in the morphology of the vessel elements, aiming to understand the growth of this species in experimental plantations. Disks from the bases of five trees were collected, and after polishing the cross-section, demarcation of the growth rings limits was carried out. The anatomical study of the wood was conducted with the purpose of characterizing the rings, and their width was measured by means of scanned images of the disks. A historical series of data was obtained concerning the diameter of the trees to establish a correlation with the width of the rings measured over the years. The growth rings limits of African mahogany wood are demarcated by a thin layer of marginal parenchyma, and the presence of false rings has been observed. Significant annual growth correlation of 0.62 was observed among the trees, being the radial increment of irregular wood in the first years (wide and narrow rings), and highlighting the 3rd and 11th year of growth in which the largest increases were observed due to a biological adaptation tendency to the environment and the occurrence of thinning carried out in the planting area, respectively.
Highlights
Knowledge of the anatomical structure of wood is important for understanding the evolutions that occurred in the wood characteristics formed during the tree’s life
The objective of this study was to characterize the formation of growth rings in Khaya ivorensis wood, as well as to analyze the variation in the morphology of the vessel elements, aiming to understand the growth of this species in experimental plantations
According to IAWA classification (1989), the growth rings of Khaya ivorensis wood can be classified as type I, meaning with distinct demarcation limits due to the presence of marginal axial parenchyma, which is an anatomical character evident in the zones that delimit them
Summary
Knowledge of the anatomical structure of wood is important for understanding the evolutions that occurred in the wood characteristics formed during the tree’s life. The insertion of studying wood growth rings in characterizing tropical and subtropical tree species is something recent. There was no recognition of the formation of annual growth rings in these species until the first studies such as that of Worbes (1995). From this point of view, there has been an increase in the research focused on this area of knowledge (Dünisch et al, 2003; Andreacci et al, 2013; Lobão et al, 2016; Rosa et al, 2017; Pagotto et al, 2017). Information on the growth of a species describes the potential for volume production of forests and the quality of the wood produced by it, but it provides a valuable basis for understanding the interactions between trees and their environment (Spiecker, 2002)
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