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
DOI:
https://doi.org/10.5902/1980509819609Keywords:
natural durability, extractives, ashes, Couratari sp., colorimetry.Abstract
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*a*b* 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 DE* mean value in attacked wood blocks and wood meal samples attained 29.5 and 14.3, respectively.
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