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Physical, chemical and mechanical properties of Pinus sylvestris wood at five sites in Portugal
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Orientador(es)
Resumo(s)
The reduction of resinous species in Portuguese forest areas has caused constraints
to wood industry supplies. Portugal represents the extreme southwest
of Scots pine (Pinus sylvestris) natural distribution and large gaps exist in the
knowledge of its wood-quality characteristics. Understanding the relationship
between these traits is important for recognizing which combination of wood
properties is the most suitable for specific uses. To address these questions,
we assessed wood-quality traits, namely, wood-density components (microdensitometric
analysis), chemical composition (NIR spectrometry) and mechanical
properties (bending tests) of wood samples collected at five representative
forest sites in Portugal. Our results showed that Portuguese Pinus sylvestris
has good radial growth and denser wood, higher extractive content and higher
stiffness and strength than northern European provenances. The lignin content
was within the range attributed to softwoods. Among the Portuguese stands,
trees growing at lower-altitude sites exhibited denser wood and higher mechanical
properties, while trees from high-elevations showed higher amounts
of lignin. Ring density was more strongly correlated with earlywood than latewood
density. A negative, non-significant correlation was found between ring
density and width, supporting the assumption that the higher radial growth
(ring width) does not negatively affect wood quality (density). In general,
chemical properties had a weak relationship with physical and mechanical
properties (MOE and MOR). Both mechanical traits were positively correlated
with density and growth components, supporting the assumption that trees
with high radial growth do not exhibit poorer mechanical performances
Descrição
Research Article
Palavras-chave
bending tests correlations mechanical traits NIR spectrometry Scots pine Pinus sylvestris wood-density components wood quality X-ray microdensitometry
Contexto Educativo
Citação
Fernandes C, Gaspar MJ, Pires J, Alves A, Simões R, Rodrigues JC, Silva ME, Carvalho A, Brito JE, Lousada JL (2017). Physical, chemical and mechanical properties of Pinus sylvestris wood at five sites in Portugal. iForest 10: 669-679
Editora
SISEF