Monitoramento da biodeterioração da madeira de três espécies amazônicas pela técnica da colorimetria

Stangerlin, Diego Martins; Costa, Alexandre Florian da; Gonçalez, Joaquim Carlos; Pastore, Tereza Cristina Monteiro; Garlet, Alencar

doi:10.1590/s0044-59672013000400004

Cited by 20 publications

(19 citation statements)

References 21 publications

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“…The hue tone angle hab ranges for wood between 0° and 90° (the first quadrate), where 0° represents the red colour and 90° represents the yellow colour. The yellow shade prevailed to the red 50 The studied tropical woods differed mainly in the lightness L * , which ranged between 34.88 ("very dark" wengé), 43.78 ("dark" padouk), 63.58 ("light" iroko) and 75.36 ("very light" okoumé). Achieved results are in an accordance with similar works disserting specific colour and texture characteristics of selected tropical woods [7,40,43].…”

Section: Colour Of Original Tropical Woodsmentioning

confidence: 97%

The Colour of Tropical Woods Influenced by Brown Rot

Vidholdová

Reinprecht

2019

Forests

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Interesting aesthetic properties of tropical woods, like surface texture and colour, are rarely impaired due to weathering, rotting and other degradation processes. This study analyses the colour of 21 tropical woods before and after six weeks of intentional attack by the brown-rot fungus Coniophora puteana. The CIEL*a*b* colour system was applied for measuring the lightness, redness and yellowness, and from these parameters the hue tone angle and colour saturation were calculated. Lighter tropical woods tended to appear a less red and a more yellow, and had a greater hue tone angle. However, for the original woods was not found dependence between the lightness and colour saturation. Tropical woods at attack by C. puteana lost a weight from 0.08% to 6.48%. The lightest and moderately light species—like okoumé, iroko, ovengol and sapelli—significantly darkened, while the darkest species—wengé and ipé—significantly lightened. The majority of tropical woods obtained a brighter shade of yellow, typically wengé, okoumé and blue gum, while some of them also a brighter shade of green, typically sapelli, padouk and macaranduba. C. puteana specifically affected the hue tone angle and colour saturation of tested tropical woods, but without an apparent changing the tendency of these colour parameters to lightness. The total colour difference of tested tropical woods significantly increased in connection with changes of their lightness (ΔE*ab = 5.92 − 0.50·ΔL*; R2 = 0.37), but it was not influenced by the red and yellow tint changes, and weight losses.

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Section: Colour Of Original Tropical Woodsmentioning

confidence: 97%

The Colour of Tropical Woods Influenced by Brown Rot

Vidholdová

Reinprecht

2019

Forests

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“…The primary biological agents responsible for the degradation of wood structures are insects, fungi, mollusks, crustaceans, and bacteria (Moreschi, 2013). The mushrooms, when attacking woody materials, eventually degrade them, causing the appearance of discoloration, release of odors characteristic of the decomposition and disintegration of particles, which reduces the resistance of wood (Stangerlin et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Identification of Wood Deteriorating Fungi in a Semi-Deciduous Seasonal Forest Fragment

2018

Aust. J. Basic & Appl. Sci.

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The plants present a natural defense against degradation, but they are subject to the biodeterioration of their living or dea d tissues, and some species are more susceptible than others due to their chemical composition and genetic load, which give them their characteristics of natural preservation. Due to its chemical and structural arrangement, the wood can suffer deterioration by different forms and can occur by chemical, physical, mechanical and biological agents. The primary biological agents responsible for the degradation of wood structures are insects, fungi, mollusks, crustaceans, and bacteria. Macrofungi constitute heterotrophic organisms that form easily distinguishable structures popularly known as mushrooms, ear-of-wood, molds, among others, some of these forms being associated with tree deaths in forest environments. Thus, the present work aimed to identify in situ situating fungi of wood in a fragment of Seasonal Semideciduous Forest, differentiating if such fungi occur in dead wood and live tree trunks. The study was developed in a native forest fragment, located in the municipality of Itambé-PE, with an area of 650 ha, for which information on the use history refers to at least 100 years without direct interventions. The city was divided into six rows spaced 400 meters apart, which were traversed to identify the fungal structures present in the woody materials. The evaluated characteristics for identification of the fungi were the color, size and specific morphometric features of the species, whose results were compared with the information described in the collection of the URM-UFPE Micoteca, following a taxonomic classification according to the Index Fungorum. 27 morphometrically different wood deteriorating fungi were observed in the natural environment, of which 20 morphospecies were identified, 13 of which occurred in dead woody material and the other seven species in living wood. The order with the highest species richness was Poryporales, whose fungi are responsible for the deterioration of lignocellulosic materials. The environmental conditions at the time of observation contributed to the development of the fruiting bodies of the fungi but may have made it difficult to identify them in the field.

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“…Portanto, além da determinação de características organolépticas da madeira in natura, a avaliação da cor da madeira é estudada no meio científico com vistas a ser consolidado no meio industrial, qualificando produtos acabados, avaliando o mecanismo de biodeterioração ou intemperismo, analisando as modificações oriundas de um tratamento preservativo, entre outros (Cademartori et al, 2013;Mattos et al, 2013;Stangerlin et al, 2013). Além disso, a utilização de técnicas de colorimetria tem demonstrado utilidade para a classificação de madeiras com propriedades físicas e mecânicas semelhantes, diferindo amostras provenientes de diferentes plantios, o que favorece a obtenção de lotes com propriedades mais homogêneas e previsíveis (Nishino et al, 2000;Moya & Marín, 2011).…”

Section: Introductionunclassified