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Chemical composition of eucalipt wood with different levels of thinning/Composicao quimica da madeira de eucalipto com diferentes niveis de desbaste

Ciência florestal, 2013-10, Vol.23 (4), p.755 [Peer Reviewed Journal]

COPYRIGHT 2013 Universidade Federal de Santa Maria ;ISSN: 1980-5098 ;EISSN: 1980-5098

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  • Title:
    Chemical composition of eucalipt wood with different levels of thinning/Composicao quimica da madeira de eucalipto com diferentes niveis de desbaste
  • Author: Zanuncio, Antonio Jose Vinha ; Colodette, Jorge Luiz ; Gomes, Femando Jose Borges ; Carneiro, Angelica de Cassia Oliveira ; Vital, Benedito Rocha
  • Subjects: Analysis ; Cellulose ; Lignin ; Paper industry ; Timber
  • Is Part Of: Ciência florestal, 2013-10, Vol.23 (4), p.755
  • Description: The objective of this study was to evaluate different thinning regimes in forest plantations of eucalypt (Eucalyptus granais x Eucalyptus urophylla) clones to produce timber for cellulose and charcoal to verify whether this effect could affect the proportion of the chemical components of wood. The average initial spacing between plants was 3x3 m and the treatments were: T1= control, T2, T3and T4 with thinning 20%, 35% and 50% of the basal area, respectively. The results were analyzed by Tukey test at 5% probability. According to the results found the lignin content from treatment T4 was higher than that of the others; the groups of uronic acids of the T1 was similar to all other treatments, but the levels of T2 and T4 differed between them. The extractives content of T1was similar to the T2 and T3 and lower than that of theT4; the carbohydrates of T1 were similar to that of T3 and higher than the others. It was concluded that thinning increases the quality of the wood to be used as energy purposes, such as charcoal production, but it did not increase productivity for wood pulp and paper production. Keywords: Eucalyptus; grinding;lignin. O objetivo deste estudo foi avaliar diferentes regimes de desbaste em plantios silviculturais de clones de eucalipto (Eucalyptus urophylla x Eucalyptus granais) para producao de madeira visando a obtencao de celulose e carvao com a finalidade de verificar se este efeito poderia afetar quantitativamente a proporcao dos componentes quimicos da madeira. O espacamento inicial medio entre plantas foi de 3 x 3 m e os tratamentos foram: T1= testemunha, T2, T3 e T4 com desbaste de 20%, 35% e 50% da area basal presente, respectivamente. Os resultados foram submetidos ao teste de Tukey com 5% de probabilidade. De acordo com os resultados, constatou-se que o teor de lignina resultante do tratamento T4 foi maior que o dos demais; o de grupos uronicos do T1 foi semelhante ao dos demais tratamentos, mas os teores dos T2 e T4 diferiram entre si. O teor de extrativos do T1 foi semelhante ao dos T2 e T3 e menor que o do T4; o de carboidratos do T1 foi semelhante ao do T3 e superior aos demais. Concluiu-se que o desbaste aumenta a qualidade da madeira para ser utilizada como fins energeticos, como producao de carvao, mas nao aumenta a produtividade de madeira destinada a confeccao de celulose e papel. Palavras-chave: Eucalyptus; desbaste; lignina.
  • Publisher: Universidade Federal de Santa Maria
  • Language: Spanish
  • Identifier: ISSN: 1980-5098
    EISSN: 1980-5098
  • Source: Bioline International
    DOAJ Directory of Open Access Journals
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