Background:The fibres dimensions vary along a tree trunk, and these variations are related to the apical meristem and vascular cambium activities; understanding these variations would guide the best use of wood. There have been studies on the pattern of fibres dimensions' variation along the tree trunk in the radial and longitudinal directions; however, the vast majority do not take into account the structure of the annual growth rings. Hence, this study aimed to obtain the pattern of fibres dimensions' variation and their quality indexes along the tree trunk take into account the structure of the annual growth rings. Two Eucalyptus urophylla x Eucalyptus grandis hybrid clones were used in the study. Ten-year-old trees were selected and discs were removed from 13 longitudinal positions. The disks were prepared and the growth rings were subsequently identified and the samples used for maceration were collected. Twenty fibres were measured in the annual growth rings present in each longitudinal position. Results:In the longitudinal direction, within the annual growth rings, the fibre dimensions and their quality indices did not show a well-defined pattern of variation. In the radial direction, the length, cell wall thickness, wall fraction, and Runkel ratio of the fibres tended to increase following the pith-bark direction, while the lumen diameter and flexibility coefficient decreased. Conclusion:Nevertheless, the fibre width and fibre slenderness index did not present a well-defined pattern of variation in the radial direction.
A quantidade de material extraído da madeira depende do solvente, genótipo e interação. O objetivo do presente trabalho foi a avaliar o efeito de clones de Eucalyptus e o tipo de solventes na quantificação dos compostos solúveis da madeira. Dez clones de Eucalyptus foram utilizados no estudo. Os ensaios de solubilidade da madeira foram realizados utilizando-se os seguintes solventes: acetona, água fria, etanol e a sequência de extração em tolueno/etanol (2:1 v/v), etanol e água quente (sequência). Os resultados permitiram evidenciar que o efeito da interação (clone x tipo de solvente) foi significativo. A solubilidade da madeira na sequência de extração foi a que apresentou o maior valor médio em todos os clones, exceto para o clone 10, que apresentou maior solubilidade em acetona. Porém, o clone 10 não apresentou efeito significativo do tipo de solvente utilizado. A solubilidade da madeira em acetona apresentou o menor valor médio.
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