Case study: Microfibril angle and its relationship with basic density in Pinus taeda L. wood from silvopastoral systems
The material resulting from fast-growing plantations is presumed to present a high percentage of juvenile wood, with high microfibril angle (MFA) and low basic density (BD), which would negatively affect the technological properties of wood. The objective of this study was to measure the MFA usi...
| Autores principales: | , , , |
|---|---|
| Formato: | info:ar-repo/semantics/artículo |
| Lenguaje: | Inglés |
| Publicado: |
Associação Brasileira Técnica de Papel e Celulose
2018
|
| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12123/4090 http://www.revistaopapel.org.br/edicoes_impressas/71.pdf |
| Sumario: | The material resulting from fast-growing plantations is presumed
to present a high percentage of juvenile wood, with high microfibril
angle (MFA) and low basic density (BD), which would negatively
affect the technological properties of wood. The objective of this
study was to measure the MFA using the technique of the orientation
of bordered and cross-field pit apertures of the tracheids walls,
determine BD and verify the correlation between the two variables.
The used material was Pinus taeda 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 the 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 MFA 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 density would not be a parameter sufficient to infer about the
structural quality of the wood. |
|---|