DENSITOMETRIA DE RAIOS X NA MADEIRA E CARVÃO DE CLONE DEEucalyptus grandis W. Hill ex Maiden X Eucalyptus urophylla S. T. Blake1

Arantes, Marina Donária Chaves; Trugilho, Paulo Fernando; Filho, Mário Tomazello; Lima, José Tarcísio; Vidaurre, Graziela Baptista

doi:10.1590/0100-67622016000100017

Cited by 7 publications

(8 citation statements)

References 2 publications

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“…The apparent wood density of the E. grandis trees, at the 12 th , 24 th , 36 th and 48 th months old, was lower than that of Eucalyptus grandis × urophylla; E. botryoides; E. camaldulensis; E. cypellocarpa; E. globulus; E. grandis; E. maculate; E. melliodora; E. nitens; E. ovata; E. polyanthemos; E. propinqua; E. regnans; E. resinifera; E. robusta; E. rudis; E. saligna; E. sideroxylon; E. tereticornis and E. viminalis with five to seven years old evaluated with X-ray methodology and with the same moisture content (12% wood moisture) 16,18,33 . This difference is due to changes in the meristem and the mechanical and physiological requirements of the tree development process, represented by increased fiber wall thickness and reduced vessel frequency and diameter, as the mature wood is formed in the trunk of E. grandis and E. grandis × urophylla trees 19,34 . The density increase over time is due to the xylem production with thin cell exchange, called juvenile wood, during the beginning of the secondary growth with more robust cells produced, forming the mature wood 35 .…”

Section: Discussionmentioning

confidence: 99%

“…X-ray densitometry characterizes wood quality in terms of its apparent density and has been used to evaluate the effect of eucalyptus tree deterioration in response to white-rot fungi, detecting core-sapwood limits and effect of forest management on the wood properties, annual biomass production and relation with wood anatomical structure 16,17 . The apparent wood density of E. grandis, from two to 20 years-old, was 0.46 to 0.80 g/cm³ in the pith and bark, respectively 16,18,19 .…”

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confidence: 96%

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RETRACTED ARTICLE: The effect of soil nutrients and moisture during ontogeny on apparent wood density of Eucalyptus grandis

Castro

Chambi-Legoas

Filho

et al. 2020

Sci Rep

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Knowledge of the effect of soil nutrients, such as K and Na and their interaction with water availability, on the growth and wood properties of the eucalypts, is needed to increase the productivity of commercial plantation forests in Brazil that generate employment and taxes. The present study evaluates the apparent wood density (at 12% wood moisture) of Eucalyptus grandis trees at 12, 24, 36 and 48 months old under ambient and lower than ambient (66%) rainfall conditions and K and Na nutrient enrichment. The treatments were two water availability (100 and 66% of the rainfall) and the three nutrient treatments were: K (4.5 kmol/ha), Na (4.5 kmol/ha) and a control (natural conditions). The apparent wood density of samples at breast height (1.3 m) was determined by X-ray densitometry and digital images. Increased nutrients at all four ages and water availability at 36 and 48 months reduced apparent wood density in E. grandis trees, however, effects of nutrients are lower under water availability reduction. The radial profile of wood density was higher in four-year-old trees, but there was radial variation in apparent wood density at all ages. These findings predict that, under water stress, apparent wood density will not decline in commercial E. grandis plantations fertilized with potassium. The use of sodium, as a substitute of potassium, should consider their negative impacts on wood density of Eucalyptus grandis trees. In Brazil, eucalyptus species are usually cultivated in soils with low fertility, potassium and other minerals scarcity and water deficit 1. The expansion of forest plantations in the country depends on the understanding of the interaction between minerals, such as sodium and potassium, and water availability, and their effect on the seasonality of tree growth and wood quality. The total or partial replacement of potassium by sodium in forest plantations has practical and scientific interest 2,3. Potassium sources, with sodium in their composition, require less energy in the fertilizer production and, therefore, reducing its final prices. These minerals affect the tree water balance and increase water use efficiency under water stress and improve drought resistance 1,4. Because wood is a product of tree growth, factors that affects the growth rate can also affect wood anatomy and therefore wood density and other physical properties. Thus, the application of silvicultural traits in a changing environmental conditions have consider the potential impacts on wood quality. As well as volume productivity, the wood properties are important factors in forest management, since its affects the transformation process and quality of wood products. In pulp and paper industry wood density is an important attribute for yield and quality of pulp and paper products 5,6. However, the effects of mineral fertilizers in wood density of young eucalyptus trees is poorly studied and with controversial results, indicating an increase 7 , decrease or no effect on apparent wood density with moisture content between 12 and 1...

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 96%

RETRACTED ARTICLE: The effect of soil nutrients and moisture during ontogeny on apparent wood density of Eucalyptus grandis

Castro

Chambi-Legoas

Filho

et al. 2020

Sci Rep

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“…Stallbaun et al (2016) also observed this relation when studying Tachigali vulgaris species under the action of xylophagous fungi. Santos et al (2011) and Arantes et al (2016) affirmed that density is one of the most common parameters to express wood quality due to its easy determination, and for being related to the other wood properties.…”

Section: Apparent Densitymentioning

confidence: 99%

Deterioration of Teak Wood in Accelerated Decay Test

et al. 2019

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The present study aimed to evaluate the biological resistance of teak (Tectona grandis) heartwood and sapwood to the action of Trametes versicolor and Gloeophyllum trabeum fungi in laboratory accelerated decay assays. The mass loss evaluation of the samples was performed periodically. The heartwood presented a higher percentage of extractives and the sapwood of holocelluloses. The sapwood and heartwood subjected to the fungus Gloephyllum trabeum remained stable. For the Trametes versicolor fungus, there was an increasing loss of mass over time for both regions, presenting a mass loss of 40% for the sapwood and of 20% for the heartwood at the conclusion of the assay. Teak wood was classified as highly resistant to the fungus Gloeophyllum trabeum, and moderately resistant to Trametes versicolor.

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“…A densidade básica é utilizada como indicador de qualidade da madeira, pois permite, por exemplo, avaliar o genótipo para a produção de uma ampla variedade de produtos florestais, como madeira sólida, carvão vegetal e polpa celulósica (Gomide et al, 2010;Arantes et al, 2016). Santos et al (2016) utilizaram um índice composto de produção e densidade da madeira para a classificação de genótipos de eucalipto.…”

Section: Introductionunclassified

Variação longitudinal da densidade básica da madeira de clones de eucalipto

Cacau,

Duarte,

Urbano

et al. 2023

Br. J. of B. Sci.

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Este trabalho teve como objetivo caracterizar a variação da densidade básica da madeira (DBM) ao longo do fuste para clones de eucalipto. Aos 96 meses após o plantio, foram abatidas seis árvores para a determinação da densidade básica da madeira, sendo três árvores do clone I-144 (Eucalyptus urophylla x Eucalyptus grandis), e três do clone 1277 (Eucalyptus grandis x Eucalyptus camaldulensis). Para cada árvore foram coletados discos de 5 cm, em seis diferentes posições ao longo do fuste (0, dap, 25, 50, 75 e 100% da altura comercial). A DBM foi determinada pelo método de imersão em água. Para garantir que a umidade das amostras estivesse acima do ponto de saturação das fibras, inicialmente as amostras foram imersas em recipientes com água. Para a obtenção da massa seca da madeira, as amostras foram acondicionadas em estufa de ventilação forçada aquecida a 103 ± 2ºC até peso constante. A DBM foi calculada pela relação entre a massa seca e volume saturado. As DBM’s médias para os clones I-144 e 1277, foram de 0,47 e 0,48 g.cm-³, respectivamente. Apesar dos valores médios da DBM terem sido semelhantes, foram observadas tendências distintas de variação longitudinal da DBM entre os clones. O clone I-144, de forma geral, apresentou redução da densidade no sentido base-topo, enquanto para o clone 1277, foram observados valores semelhantes para a DBM na base e no topo.

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DENSITOMETRIA DE RAIOS X NA MADEIRA E CARVÃO DE CLONE DEEucalyptus grandis W. Hill ex Maiden X Eucalyptus urophylla S. T. Blake1

Cited by 7 publications

References 2 publications

RETRACTED ARTICLE: The effect of soil nutrients and moisture during ontogeny on apparent wood density of Eucalyptus grandis

RETRACTED ARTICLE: The effect of soil nutrients and moisture during ontogeny on apparent wood density of Eucalyptus grandis

Deterioration of Teak Wood in Accelerated Decay Test

Variação longitudinal da densidade básica da madeira de clones de eucalipto

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