Abstract
The wood density is one of the parameters that most affect its properties, which makes it knowledge essential for any use indication. However, due to the high variability of this aspect within the tree, its determination shall consider a sampling throughout the stem. Thus, this study aimed to evaluate the longitudinal and radial variations of Pinus taeda L. wood density for individuals with different ages. To that end, trees with 8, 14, 18 and 26 years old were cut, and discs with 10, 35, 55 and 75% were removed from the tree total height and another in the height corresponding to the chest height diameter– DBH, taken at a 1.30m. From these, samples were collected in three different positions in the pith-bark direction (next to pith, intermediate and next to bark) to determine the density. A significant density increase was observed for older trees samples. A density reduction from the basis to the top and an increase from the pith to the bark was observed.
Highlights
IntrodutionPinus taeda is a major Pinus of the Southern United States. Natural range this species extends from New Jersey to the South Florida and to west Texas and Oklahoma
RESUMO: A densidade da madeira é um dos parâmetros mais influentes em suas propriedades, o que torna o seu conhecimento essencial para qualquer indicação de uso
The present study aimed to evaluate the variation in Pinus taeda wood density to different positions in the stem, in basis-top and pith-to-bark directions to trees with different ages
Summary
Pinus taeda is a major Pinus of the Southern United States. Natural range this species extends from New Jersey to the South Florida and to west Texas and Oklahoma. As for the same tree, this variation may occur both in axial direction (basis‐top) and in the radial direction (pith-to-bark) Such variations occur due to a complex anatomical combination, physical and chemical factors, which are mainly influenced by tree age, genotype and environmental conditions. In this sense, the present study aimed to evaluate the variation in Pinus taeda wood density to different positions in the stem, in basis-top and pith-to-bark directions to trees with different ages. An analysis with factorial arrangement was performed to evaluate the results, with three factors: age with four levels (8, 14, 18 and 26 years old); the stem axial position with five levels (10%, DBH, 35, 55 and 75%); and radial position in the stem with three levels (near the pith, intermediate and near the bark). Regression analysis was carried out to estimate the wood mean density from the samples density taken in DBH height
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