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Accelerated laboratory test of three Amazonian wood species called tauari, exposed to white- and brown-rot fungi and color response according to CIE [L.sup.][A.sup.][B.sup.] system/ Ensaio acelerado de laboratorio de tres especies de madeiras da amazonia chamadas de tauari, expostas aos fungos de podridao-branca e parda e resposta colorimetrica de acordo com o sistema CIE [L.sup.][A.sup.][B.sup.]

Ciência florestal, 2015-07, p.581 [Peer Reviewed Journal]

COPYRIGHT 2015 Universidade Federal de Santa Maria ;ISSN: 1980-5098 ;EISSN: 1980-5098

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  • Title:
    Accelerated laboratory test of three Amazonian wood species called tauari, exposed to white- and brown-rot fungi and color response according to CIE [L.sup.][A.sup.][B.sup.] system/ Ensaio acelerado de laboratorio de tres especies de madeiras da amazonia chamadas de tauari, expostas aos fungos de podridao-branca e parda e resposta colorimetrica de acordo com o sistema CIE [L.sup.][A.sup.][B.sup.]
  • Author: Okino, Esmeralda Yoshico Arakaki ; Pastore, Tereza Cristina Monteiro ; Camargos, Jose Arlete Alves ; Coradin, Vera Terezinha Rauber ; Teixeira, Divino Eterno ; Santana, Marcos Antonio Eduardo ; Fagg, Christopher William
  • Is Part Of: Ciência florestal, 2015-07, p.581
  • Description: The purposes of this study were to: evaluate de natural durability of three species of tauari (Couratari guianensis Aublet, Couratari oblongifolia Ducke & R.Knuth and Couratari stellata A.C.Smith), report the colorimetric parameters according to CIE [L.sup.*][a.sup.*][b.sup.*] 1976 system and also show the appearance of control and attacked wood blocks. Two brown-rot [Gloeophyllum trabeum (Persoon ex Fries) Murril. and Lentinus lepideus Fr.] and two white-rot [Trametes versicolor (Linnaeus ex Fries) Pilat and Ganoderma applanatum (Pers. ex Wallr.)] fungi were used. Tauari wood was classed as "moderately resistant" to "resistant" when exposed to Gloeophyllum trabeum, Trametes versicolor and Ganoderma applanatum fungi. All extractives' contents of attacked samples decreased when compared with the control (sound wood), except Couratari stellata exposed to Ganoderma applanatum. Conversely, all ash contents increased when compared with the control, except Couratari stellata exposed to Gloeophyllum trabeum. All attacked wood blocks and wood meal samples were darker, except wood meal from Couratari stellata exposed to Trametes versicolor, and redder than the control. The Δ[E.sup.*] mean value in attacked wood blocks and wood meal samples attained 29.5 and 14.3, respectively. Keywords: natural durability; extractives; ashes; Couratari sp.; colorimetry. Os objetivos deste estudo foram: avaliar a durabilidade natural de tres especies de tauari (Couratari guianensis Aublet, Couratari oblongifolia Ducke & Knuth R. e Couratari stellata A.C.Smith), relatar os parametros colorimetricos de acordo com o sistema CIE [L.sup.*] [a.sup.*] [b.sup.*] 1976 assim como mostrar a aparencia dos blocos de madeira antes e apos o ataque. Dois fungos de podridao-parda [Gloeophyllum trabeum (Persoon ex Fries) Murril. e Lentinus lepideus Fr.] e dois de podridao-branca [Trametes versicolor (Linnaeus ex Fries) Pilat e Ganoderma applanatum (Pers. ex Wallr.)] foram utilizados. A madeira de tauari foi classificada como "moderadamente resistente" a "resistente" quando exposta aos fungos Gloeophyllum trabeum, Trametes versicolor e Ganoderma applanatum. O conteudo de extrativos das amostras atacadas diminuiu quando comparado com o controle, exceto Couratari stellata expostos a Ganoderma applanatum. Por outro lado, os conteudos de cinzas aumentaram quando comparados com o controle, exceto para a madeira de Couratari stellata exposto ao Gloeophyllum trabeum. Todos os blocos de madeira atacados e as serragens tornaram-se mais escuras, exceto para a serragem de Couratari stellata exposto ao fungo Trametes versicolor, e mais vermelho do que a amostra sem ataque. O ΔE * medio do bloco de madeira e serragem, atacados, atingiram 29,5 e 14,3, respectivamente. Palavras-chave: durabilidade natural, extrativos; cinzas; Couratari sp.; colorimetria.
  • 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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