Colour and decay resistance and its relationships in Eperua grandiflora

Amusant, Nadine; Fournier, Mériem; Beauchêne, Jacques

doi:10.1051/forest:2008061

Cited by 10 publications

(6 citation statements)

References 24 publications

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“…Usually, the lightest and medium light tropical woods okoumé, sapelli, iroko and ovengol had the highest ΔE  ab values from 11.28 to 24.26. This result is in an accordance with other works dealing with the durability and colour changes of tropical woods due to biological deterioration [48,49]. However, it was simultaneously observed that after attack by C. puteana the top surfaces of wengé and padouk (darker tropical woods- Table 2) also had high In the fungal-attacked tropical woods, again no evident relationships were found between the lightness and redness (R 2 = 0.11), or the lightness and colour saturation (R 2 = 0.06).…”

Section: Colour Of Tropical Woods Exposed To the Fungus Coniophora Pusupporting

confidence: 93%

“…On the contrary, effects of the Δa  and Δb  values of all tropical species on the ΔE  ab value were not significant ( Figures 5B, 5C). Several studies have shown that there are some relationships between the colour parameters of wood and its decay resistance [15,16,[46][47][48][49][50]. The relationship between the colour and weight loss of decayed wood is based on the type and amount of wood extractives, which have effect on the colour, and on its decay resistance.…”

Section: Colour Of Tropical Woods Exposed To the Fungus Coniophora Pumentioning

confidence: 99%

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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 Tropical Woods Exposed To the Fungus Coniophora Pusupporting

confidence: 93%

Section: Colour Of Tropical Woods Exposed To the Fungus Coniophora Pumentioning

confidence: 99%

The Colour of Tropical Woods Influenced by Brown Rot

Vidholdová

Reinprecht

2019

Forests

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“…(1)) allowed us to determine the reference dry matter M02 (Eq. (2)) of the test specimens (Amusant et al, 2008). For each wood species, we used 12 test specimens and 12 controls per radial position (sapwood and heartwood) respectively for decay test and moisture content determination.…”

Section: Sampling Materialsmentioning

confidence: 99%

Diversity of decay resistance strategies of durable tropical woods species: Bocoa prouacencsis Aublet, Vouacapoua americana Aublet, Inga alba (Sw.) Wild

Amusant¹,

Nigg²,

Thibaut³

et al. 2014

International Biodeterioration & Biodegradation

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International audienceThe study of decay resistance in wood is of interest for wood end-users but also for the global carbon balance since wood biodegradation is a key driver of forest ecosystem functioning through its impacts on carbon and nutrient cycling. We studied the density and wood extractive contents in order to understand decay resistance against soil microflora after 90 days exposure of sapwood and heartwood from three Neotropical wood species known for their decay resistance: Bocoa prouacensis, Vouacapoua americana, Inga alba. Decay resistance was correlated with density more than wood extractive content. The results highlighted different decay resistance strategies. In B. prouacensis, both sapwood and heartwood were highly resistant due to the high density and high content of antifungal wood extractives. In V. americana heartwood, decay resistance was due to the high synergistic-acting wood extractive content. Conversely, with the least dense wood species I. alba, we found that decay resistance was due to the antifungal wood extractives synthesized early in the sapwood. In conclusion, we showed that the three wood species with the same level of heartwood decay resistance performance had different decay resistance strategies according to the anatomic and defensive wood traits

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“…Figure 1a shows the variations in shape and color between heartwood and sapwood. The heartwood of eastern cedar has a dark red color that distinguishes it from the sapwood due to the higher extractives content in the heartwood (Amusant et al 2008;Freitag and Morrell 2001;Taylor et al 2002).…”

Section: Methodsmentioning

confidence: 99%

Variation of Brown Rot Decay in Eastern White Cedar (Thuja occidentalis L.)

Bouslimi¹,

Koubaa²,

Bergeron³

2013

BioResources

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Variations in brown rot decay and proportions of heartwood and sapwood were investigated in eastern white cedar (Thuja occidentalis L.). This experiment tested the hypothesis that the incidence of brown rot decay depends on the site, tree age, tree height, and heartwood/ sapwood ratio. Forty-five trees were sampled and felled from three mature stands in the Abitibi-Témiscamingue region, Quebec, Canada. From each tree, disks were systematically sampled along the entire stem, and the heartwood, sapwood, and decay proportions and volumes were determined for each disk. Scanning electron microscopy showed that growth of fungi causing brown rot decay was limited and slower in latewood than in earlywood due to the narrow cell lumen, thick wall, and limited number of bordered pits in latewood tracheids. Site, tree height, and tree age had significant effects on the proportions of sapwood, heartwood, and decay. Heartwood and brown rot decay proportions decreased from the base of the tree upward, while the sapwood proportion increased. There was more decay in older trees and in those growing on moist versus dry sites; however, decay was not serious in trees younger than 80 years. In addition, brown rot decay proportion correlated strongly and positively with heartwood proportion and tree volume, but negatively with sapwood proportion.

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Colour and decay resistance and its relationships in Eperua grandiflora

Cited by 10 publications

References 24 publications

The Colour of Tropical Woods Influenced by Brown Rot

The Colour of Tropical Woods Influenced by Brown Rot

Diversity of decay resistance strategies of durable tropical woods species: Bocoa prouacencsis Aublet, Vouacapoua americana Aublet, Inga alba (Sw.) Wild

Variation of Brown Rot Decay in Eastern White Cedar (Thuja occidentalis L.)

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