RESUMOO objetivo deste estudo foi avaliar a variação do teor e espessura da casca e da densidade básica da madeira de Eucalyptus e Acacia plantados em monocultivo e consórcio. Cinco árvores de Eucalyptus urophylla × E. grandis e cinco de Acacia mangium foram investigadas em plantios monoespecíficos e mistos, totalizando 20 árvores. O teor e espessura da casca produzida pela Acacia em monocultivo (47,5% e 1,32 cm) foram aproximadamente três vezes superiores, quando comparadas àquelas do plantio consorciado (15,2% e 0,51 cm). A partir desses resultados, conclui-se que não há diferença significativa entre as médias da densidade básica das madeiras de Eucalyptus e Acacia provenientes dos plantios monoespecíficos e mistos. Contudo, há variação longitudinal significativa em termos de densidade básica da madeira das árvores de Acacia e de Eucalyptus provenientes tanto do plantio monocultivado como do consorciado, indicando que há diferença na qualidade da madeira manejada para uso múltiplo.Palavras-chave: monocultivo, plantio misto, floema, xilema, densidade, madeira. Wood and Bark of Eucalyptus and Acacia in Pure and Mixed Stands ABSTRACTThis study aimed to evaluate the variation of the bark content and thickness, and wood basic density of Eucalyptus and Acacia planted in pure and mixed stands. Five trees of Eucalyptus urophylla × E. grandis and Acacia mangium were investigated in pure and mixed stands, totaling 20 trees. The content and thickness of the bark produced by Acacia in monoculture (47.5% and 1.32 cm) were approximately three times higher than those from mixed stand (15.2% and 0.51 cm). From these results, it can be concluded that there is no significant mean difference between the density for Eucalyptus and Acacia wood from the pure and mixed plantings. However, there is significant longitudinal variation of basic density of Acacia and Eucalyptus wood from pure and mixed stand, indicating differences in the wood quality from logs managed for multiple use.
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