Qualidade da madeira e divergência genética de Araucaria angustifolia (Bertoni) O. ktze

Abstract

The objective of this study was to evaluate the quality of wood for lamination and a genetic divergence among 25 matrices of Araucária angustifólia coming from a seminal planting of 39 years old, located in the municipality of Palma Sola, SC. Were been evaluated the following characteristics: silvicultural: height, diameter at breast height and volume of wood with bark and without bark; Morphometric: conicity and flatness and physical properties: basic density in the radial and longitudinal direction, linear retraction and volumetric and the collapse. Analysis were performed using the grouping technique through Tocher optimization method, use of dissimilarity based on Euclidean distance adopting, as parameter, the graphic dispersion by the main components and performing the grouping Through the Unweighted Pair Group Method using Arithmetic averages (UPGMA). Based on the observed results, the low values of conicity, flattening and dimensional variation presented favorable characteristics for the production of homogeneous sheets that qualifies A. angustifolia wood for the production of laminated panels. The variation of the basic density in the radial and longitudinal direction presented statistical differences between the positions. The study of dissimilarity allowed the formation of four groups of matrices. Genotypes intended for wood for lamination must have higher DBH and height with lower values of flattening and tangential retraction. The most prominent matrices with potential for an improvement program were M1e M21.