ANATOMICAL AND CHEMICAL PROPERTIES OF JUVENILE Schizolobium amazonicum WOOD
ABSTRACT The objective of this study was to determine the effects of tree age and of pith-bark and base-top positions on anatomical characteristics, and the effect of age on the chemical components of Schizolobium amazonicum (Paricá wood). The material was obtained from commercial plantations in the...
Saved in:
Published in: | Revista árvore Vol. 42; no. 3 |
---|---|
Main Authors: | , , , , , , |
Format: | Journal Article |
Language: | English |
Published: |
Sociedade de Investigações Florestais
01-01-2018
|
Subjects: | |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | ABSTRACT The objective of this study was to determine the effects of tree age and of pith-bark and base-top positions on anatomical characteristics, and the effect of age on the chemical components of Schizolobium amazonicum (Paricá wood). The material was obtained from commercial plantations in the states of Maranhão and Pará with ages of 5, 7, 9 and 11 years. The first three logs (2.7 m length each) were obtained from the trees of each age. Only the effect of age was analyzed for the chemical characterization of the wood. The dimensions of the fibers increased along the pith-bark direction, while wall thickness decreased and the length of the fibers increased with aging. The width of the fibers and the lume diameter increased in the base-top direction. Paricá wood presented low extractive and hemicellulose content, and high cellulose content. The anatomical characteristics were more affected by the factors under study than the chemical composition, evidencing that the chemical elements of the wood are more stable with aging in relation to the anatomical characteristics.
RESUMO O objetivo deste trabalho foi determinar os efeitos da idade das árvores e das posições medula-casca e base-topo nas características anatômicas e o efeito da idade nos componentes químicos da madeira de Schizolobium amazonicum (paricá). O material foi obtido de plantios comerciais nos estados do Maranhão e Pará, com idades de 5, 7, 9 e 11 anos. Das árvores de cada idade foram obtidas as três primeiras toras (de 2,7 m de comprimento cada). Para a caracterização química da madeira analisou-se apenas o efeito da idade. As dimensões das fibras aumentaram no sentido medula-casca, enquanto a espessura da parede reduziu e o comprimento das fibras aumentou juntamente com a idade. A largura das fibras e o diâmetro do lume aumentaram no sentido base-topo. A madeira de paricá apresentou baixo teor de extrativos e de hemiceluloses, e alto teor de celulose. As características anatômicas foram mais afetadas pelos fatores em estudo do que a composição química, evidenciando que os elementos químicos da madeira são mais estáveis com a idade em relação aos caracteres anatômicos. |
---|---|
ISSN: | 0100-6762 1806-9088 1806-9088 |
DOI: | 10.1590/1806-90882018000300001 |