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Ciência Florestal
Centro de Pesquisas Florestais - CEPEF, Departamento de Ciências Florestais - DCFL, Programa de Pós Graduação em Engenharia Florestal - PPGEF
ISSN: 0103-9954
EISSN: 0103-9954
Vol. 25, No. 3, 2015, pp. 581-593
Bioline Code: cf15055
Full paper language: English
Document type: Research Article
Document available free of charge

Ciência Florestal, Vol. 25, No. 3, 2015, pp. 581-593

 en ACCELERATED LABORATORY TEST OF THREE AMAZONIAN WOOD SPECIES CALLED TAUARI, EXPOSED TO WHITE- AND BROWN-ROT FUNGI AND COLOR RESPONSE ACCORDING TO CIE L* A* B* SYSTEM
Okino, Esmeralda Yoshico Arakaki; Pastore, Tereza Cristina Monteiro; Camargos, José Arlete Alves; Coradin, Vera Terezinha Rauber; Teixeira, Divino Eterno; Santana, Marcos Antonio Eduardo & Fagg, Christopher William

Abstract

The purposes of this study were to: evaluate de natural durability of three species of tauari ( Couratari guianensis check for this species in other resources Aublet, Couratari oblongifolia check for this species in other resources Ducke & R.Knuth and Couratari stellata check for this species in other resources A.C.Smith), report the colorimetric parameters according to CIE L*a*b* 1976 system and also show the appearance of control and attacked wood blocks. Two brown-rot [ Gloeophyllum trabeum check for this species in other resources (Persoon ex Fries) Murril. and Lentinus lepideus check for this species in other resources Fr.] and two white-rot [ Trametes versicolor check for this species in other resources (Linnaeus ex Fries) Pilat and Ganoderma applanatum check for this species in other resources (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 ΔE* 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

 
 pt ENSAIO ACELERADO DE LABORATÓRIO DE TRÊS ESPÉCIES DE MADEIRAS DA AMAZÔNIA CHAMADAS DE TAUARI, EXPOSTAS AOS FUNGOS DE PODRIDÃO-BRANCA E PARDA E RESPOSTA COLORIMÉTRICA DE ACORDO COM O SISTEMA CIE L* A* B*
Okino, Esmeralda Yoshico Arakaki; Pastore, Tereza Cristina Monteiro; Camargos, José Arlete Alves; Coradin, Vera Terezinha Rauber; Teixeira, Divino Eterno; Santana, Marcos Antonio Eduardo & Fagg, Christopher William

Resumo

Os objetivos deste estudo foram: avaliar a durabilidade natural de três espécies de tauari ( Couratari guianensis check for this species in other resources Aublet, Couratari oblongifolia check for this species in other resources Couratari oblongifolia Ducke & Knuth R. e Couratari stellata check for this species in other resources A.C.Smith), relatar os parâmetros colorimétricos de acordo com o sistema CIE L * a * b * 1976 assim como mostrar a aparência dos blocos de madeira antes e após o ataque. Dois fungos de podridão-parda [ Gloeophyllum trabeum check for this species in other resources (Persoon ex Fries) Murril. e Lentinus lepideus check for this species in other resources Fr.] e dois de podridão-branca [ Trametes versicolor check for this species in other resources (Linnaeus ex Fries) Pilat e Ganoderma applanatum check for this species in other resources (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 conteúdo de extrativos das amostras atacadas diminuiu quando comparado com o controle, exceto Couratari stellata expostos a Ganoderma applanatum. Por outro lado, os conteúdos 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 * médio do bloco de madeira e serragem, atacados, atingiram 29,5 e 14,3, respectivamente.

Palavras-chave
durabilidade natural; extrativos; cinzas; Couratari sp.; colorimetria

 
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