Case study: Microfibril angle and its relationship with basic density in Pinus taeda L. wood from silvopastoral systems

WINCK, A.; FSSOLA, H.; TMAZELLO F., M.; AREA, M.C.

O PAPEL

ABTCP

Lugar: Sao Paulo; Año: 2013 vol. 74 p. 55 - 61

0031-1057

The material resulting from fast-growing plantations is presumed to present a high percentage of juvenile wood, with high microfibril angle (MFA) y and low basic density (BD) which would negatively affect the technological properties of wood. The objective of this study was to measure the AMF, using the technique the orientation of bordered and cross-field pit apertures of the tracheids walls, determine BD and verify the correlation between the two variables. Was used Pinus taeda wood of 15 years old from a stand with silvopastoral management. The pit apertures of the earlywood tracheids showed to be more rounded and abundant compared to those of latewood. The MFA decreased from 56.2 to 42.1 degrees and wood density increased from 0.31 to 0.42 g/cm3 from the pith to the bark. The high values of AMF could be explained by the genetic material, with low degree of breeding, and also by the wide spacing between trees, which favors the fast growth, but could also be due to the employed methodology. The correlation between MFA and density in this study is moderate and negative (R= -0.59), indicating that the density would not be a parameter sufficient to infer about the structural quality of the wood.