Propriedades da madeira de cerne e alburno de Eucalyptus camaldulensis

Costa, Ana Carolina da; Leal, Camila Sanick; Santos, Luiz Carlos Oliveira dos; Carvalho, Ana Márcia Macêdo Ladeira; Oliveira, Aylson Costa; Pereira, Bárbara Luísa Corradi

doi:10.12953/2177-6830/rcm.v8n1p10-20

Cited by 12 publications

(12 citation statements)

References 5 publications

(6 reference statements)

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“…Diferentes letras na coluna representam diferença estatística de acordo com o teste de Scott-Knott (p < 0,05) e as barras de erro, o desvio padrão. Carvalho (2003) relatou que a madeira pode alcançar até 1.210 kg.m -3 , enquanto que para A. cearensis, os resultados encontrados foram semelhantes aos relatados por Azevêdo et al (2010), o qual obteve DB média de 630 kg.m -3 . Madeiras com densidades elevadas culminam em carvões vegetais mais densos, resistentes e com maior densidade energética, portanto mais adequados ao uso siderúrgico (CARNEIRO et al, 2014).…”

Section: Discussão 41 Propriedades Químicas Físicas E Energéticas unclassified

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Avaliação De Três Madeiras Nativas Do Cerrado Goiano Visando À Utilização Energética

Siqueira

Patrício

Lima

et al. 2020

NAT

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Estudos que visem ampliar o conhecimento das madeiras oriundas do cerrado podem contribuir com o correto manejo das espécies. O objetivo deste estudo foi avaliar a qualidade da madeira e do carvão vegetal de três espécies do cerrado (Tachigali vulgaris, Myracrodruon urundeuva e Amburana cearensis) para fins energéticos. Foram amostradas duas árvores por espécie e, destas, foram retirados discos da base, a 25, 50, 75 e 100% da altura total. Para a madeira, determinou-se longitudinalmente a densidade básica, composição química, estoque de carbono, poderes caloríficos superior (PCS) e inferior (PCI) e densidade energética. As carbonizações da madeira foram realizadas em forno elétrico, com temperatura final de 450 ºC e taxa de aquecimento de 1,67 ºC.min-1. A posição longitudinal de amostragem não influenciou a densidade da madeira. A madeira de M. urundeuva apresentou maior densidade básica e PCS, bem como menor teor de materiais voláteis. O carvão da espécie T. vulgaris apresentou a menor densidade aparente (298 kg.m-3) e baixo teor de cinzas (1,14%), porém elevado teor de carbono fixo e PCS. O carvão vegetal da espécie M. urundeuva se destacou com elevada densidade relativa aparente (475 kg.m-3). A ordem das melhores espécies é: M. urundeuva, A. cearensis e T. vulgaris. Palavras-chave: energia renovável; espécies nativas; potencial energético; qualidade do carvão. ASSESSMENT OF THREE NATIVE WOODS FROM CERRADO OF GOIÁS FOR THE ENERGY PURPOSES ABSTRACT: Studies aimed at expanding the knowledge of woods from cerrado can contribute to the correct management of the species. The aim of this study was to evaluate the quality of wood and charcoal of three species from cerrado (Tachigali vulgaris, Myracrodruon urundeuva, and Amburana cearensis) for energy purposes. Two trees per species were sampled and, from these, disks were removed from the base, at 25, 50, 75, and 100% of the total height. For wood, the properties basic density, chemical analysis, carbon stock, higher (HHV) and lower (LHV) heating values were determined longitudinally. Carbonizations were carried out in a muffle furnace with a final temperature of 450 ºC and heating rate of 1.67 ºC.min-1. There was no effect of longitudinal position under the wood basic density. Myracrodruon urundeuva wood had the highest basic density and HHV, as well as the lowest content of volatile matters. The Tachigali vulgaris charcoal had the lowest bulk density (298 kg.m-3) and low ash content (1.14%), but a high content of fixed carbon and HHV. Charcoal of the species M. urundeuva stood out with high apparent relative density (475 kg.m-3). The order of the best species is M. urundeuva, A. cearensis, and T. vulgaris. Keywords: renewable energy; native species; energy potential; charcoal quality.

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Section: Discussão 41 Propriedades Químicas Físicas E Energéticas unclassified

“…Os valores de TCz verificados na madeira das espécies T. vulgaris e M. urundeuva, foram similares aos trabalhos relatados na literatura para madeira de eucalipto com valores médios entre 0,07% e 1,00% (PROTÁSIO et al, 2011;NEVES et al, 2011;SILVA et al, 2015;COSTA et al, 2017).…”

Section: Discussão 41 Propriedades Químicas Físicas E Energéticas unclassified

Avaliação De Três Madeiras Nativas Do Cerrado Goiano Visando À Utilização Energética

Siqueira

Patrício

Lima

et al. 2020

NAT

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“…The heartwood content varied in the base-top direction of the stem with great reduction in the tree height, as shown in Figure 4. Half of the trees sampled showed heartwood up until 50% of commercial height, and none of the trees had heartwood in 75% and 100% Reduction in heartwood percentages in the base-top direction of the stem was also observed in 7.5-year-old E. camaldulensis (Pereira et al, 2013;Costa et al, 2017); in 9-year-old Eucalyptus sp. (Teixeira, 2015); in 9-year-old E. globulus (Gominho & Pereira, 2000;Gominho & Pereira, 2005), 18-year-old (Miranda et al, 2015); and in E. grandis × E. urophylla hybrids of approximately 5.6-year-old (Gominho et al, 2001) 6 and 14-year-old (Gonçalves et al, 2010).…”

Section: /9mentioning

confidence: 89%

Effect Of Planting Spacing In Production And Permeability Of Heartwood And Sapwood Of Eucalyptus Wood

et al. 2019

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The objective of this work was to evaluate the influence of different useful areas provided by the planting spacings (3 × 1, 3 × 2, 3 × 3, 3 × 4 m) on the production and permeability of heartwood and sapwood of Eucalyptus grandis and Eucalyptus grandis × Eucalyptus urophylla clones at 4 years old. Regardless of the clone, there was no effect of planting spacing on the heartwood/sapwood relation and wood permeability. All clones showed a heartwood decrease with increased height, regardless of planting spacing, and E. grandis (B) was the only one that had its heartwood percentage positively and significantly correlated with the dendrometric variables (DBH and commercial height). The use of the dymethil yellow compound was indispensable in defining the heartwood and sapwood regions in the samples from 50% of the stem height. The heartwood permeability was low in all evaluated clones, suggesting vessel obstruction by tyloses or other deposits, while sapwood permeability reached 405.4 cm3/cm.atm.s.

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“…There was an increase in the moisture content in the basetop direction, thus indicating the moisture content is inversely proportional to the density of the wood, due to the higher proportion of heartwood found in the lower part of the trunk and younger wood at the top. According to Costa et al (2017), higher moisture content in the heartwood can hinder its drying, since it is less permeable than sapwood, mainly due to the obstruction of the vessels by tyloses and bud resins, caused by the cernification process, which makes it difficult to transport water from the inner to the outer parts of the wood.…”

Section: Longitudinal Variation Of Moisture Contentmentioning

confidence: 99%

Longitudinal variation of wood quality in the five forest species from Caatinga

Batista

Melo

Medeiros

et al. 2020

Agraria

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The present study aimed to evaluate the dendrometric and chemical characteristics and variation of basic density and moisture content (green) of the wood of five Caatinga forest species along the commercial longitudinal direction (base-top) of logs. The studied species were pau-branco (Auxemma oncocalyx (Fr. All.) Taub.), jurema preta (Mimosa tenuiflora (Willd.) Poir.), jurema-de-embira (Mimosa ophthalmocentra Mart. ex Benth.), pereiro (Aspidosperma pyrifolium Mart.) and sabiá (Mimosa caesalpiniifolia Benth.). Fifteen trees were harvested, three of each species. The trees had diameter at breast height of 8 to 12 cm. Five disks with thickness of 10 cm were removed from each tree at the positions 0 (base), 25, 50, 75 and 100% of the commercial height. The dendrometric characteristics showed that the choices of the trees contributed to a better analysis of the physicochemical properties of the wood. The five studied species could be described by the same model of longitudinal variation of basic density, decreasing from the base to top, while the moisture content (green) presented inverse behavior, with an increase in this same direction. All species had good quality for the production of sawn lumber, veneers, firewood and charcoal. In the chemical composition, the wood presented constituents that convey natural durability, as well as use for energy purposes.

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Propriedades da madeira de cerne e alburno de Eucalyptus camaldulensis

Cited by 12 publications

References 5 publications

Avaliação De Três Madeiras Nativas Do Cerrado Goiano Visando À Utilização Energética

Avaliação De Três Madeiras Nativas Do Cerrado Goiano Visando À Utilização Energética

Effect Of Planting Spacing In Production And Permeability Of Heartwood And Sapwood Of Eucalyptus Wood

Longitudinal variation of wood quality in the five forest species from Caatinga

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