Caracterização anatômica da madeira de sete espécies da amazônia com vistas à produção de energia e papel

Paula, José Elías de

doi:10.1590/1809-4392200332262

Cited by 24 publications

(29 citation statements)

References 3 publications

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“…We found few studies that present data on wood density of Cerrado trees and shrubs (Table ; Table S1). Most of these studies evaluated species for potential energy production (Paula , , Vale et al . , , Santos , Thompson ).…”

Section: Resultsmentioning

confidence: 99%

Regional Variations in Biomass Distribution in Brazilian Savanna Woodland

et al. 2014

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The Cerrado, the savanna biome in central Brazil, mostly comprised of woodland savanna, is experiencing intense and fast land use changes. To understand the changes in Cerrado carbon stocks, we present an overview of biomass distribution in different Cerrado vegetation types (i.e., grasslands, shrublands and forestlands). We surveyed 26 studies including 170 Cerrado sites. The grasslands presented mean total biomass of 24 Mg/ha, with 70 percent allocated in the belowground portion. In shrublands, the mean total biomass was 58 Mg/ha being 58 percent in the belowground portion. Finally, in forestlands the mean total biomass was 98 Mg/ha with 18 percent as belowground biomass. The surveyed studies presented 12 allometric equations for biomass estimate, most involving both diameter and height. Data on wood density for Cerrado shrubs and trees are not abundant and the average value was 0.66 g/cm3, similar to that found in the central portion of the Amazon Forest. We also examined the relationship between total precipitation and dry‐season intensity with biomass variation in the Cerrado shrubland using data from tropical rainfall measurement mission (TRMM) for the period 2000–2010. Dry‐season precipitation amount in cerrado areas in severe drought regions explained 29 percent of the variation in aboveground woody biomass. This finding is important in the face of the predictions of longer and more severe dry seasons in the region due to climate change.

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Section: Resultsmentioning

confidence: 99%

Regional Variations in Biomass Distribution in Brazilian Savanna Woodland

et al. 2014

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“…Segundo Paula (2003), a análise dos parâmetros referente às fibras fornece subsídios seguros da qualidade do papel, podendo cada tipo de papel, do ponto de vista físico, ser obtido com fibras indicadas pelos parâmetros analisados, tal indicação pode ser feita examinando o índice de Runkel e o coeficiente de flexibilidade das fibras, que deve obter valores superiores a 50%, para que se possa diagnosticar sua eficiência como fonte de celulose. Este coeficiente é um indicativo do grau de colapso que as fibras sofrem durante o processo de fabricação de papel, pois quanto mais alto esse valor maior será o grau de colapso.…”

Section: Regiões Da Folhaunclassified

Morfometria das fibras das folhas de Astrocaryum murumuru var. murumuru Mart. (ARECACEAE)

Rocha

Potiguara

2007

Acta Amaz.

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A análise morfométrica das fibras das folhas de Astrocaryum murumuru var. murumuru Mart. revelou que as fibras do pecíolo apresentaram comprimento e espessura da parede superiores às regiões da ráquis e folíolo, com médias variando de 1.266,09 µm a 3.270,56 µm e 5,56 µm a 10,67 µm, respectivamente. Em relação ao índice de Runckel e coeficiente de flexibilidade, as regiões pecíolo e ráquis obtiveram valores considerados favoráveis para sua utilização na indústria papeleira e, o índice de enfeltramento demonstrou que provavelmente as fibras dessas regiões apresentarão uma boa resistência ao rasgo quando submetidas às avaliações físico-mecânicas. Diante dos resultados, a espécie se revela promissora como fonte alternativa de matéria-prima para a produção de papel, sendo necessários, entretanto, estudos de resistências físico-mecânicas a consolidação deste pré-diagnóstico.PALAVRAS-CHAVE: Palmeira, Fibras, Papel. Leaf fibers morphometry of Astrocaryum murumuru var. murumuru Mart. (ArecAceAe) ABSTRACTThe analysis morphometric of the leaf fibers of Astrocaryum murumuru var. murumuru Mart. demonstrated that the petiole's fibers had presented length and wall thickness superiors than the rachis and leaflets, with yours means varying of 1.266,09 µm to 3.270,56 µm and 5,56 µm to 10,67 µm, respectively. In relation the index of Runckel and flexibility's coefficient the petiole and rachis had gotten values considered favorable for its use in the paper industry and, the felting index it probably demonstrated that the fibers of these regions will present good crash resistance when submitted to the evaluations physicalmechanical. therefore, the results show the species is a alternative source of raw material to produce paper, but its necessary to do physical-mechanical resistance studies to consolidate this pre diagnostic.

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“…Increased density is important for the final quality of the charcoal, but it is necessary to observe alterations on the anatomic aspects of the wood, which are important for the field drying and carbonization process (FREDERICO, 2009). Therefore, it is preferable to use woods with elevated wall fraction, however, it must be considered that if the wall fraction is high, but the wood has a low percentage of fiber, it must not be used for this activity (PAULA, 2005).…”

Section: Introductionmentioning

confidence: 99%

Correlations Between Age, Wood Quality and Charcoal Quality of Eucalyptus Clones

Castro

Carneiro

et al. 2016

Rev. Árvore

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-Brazil is world's greater producer of charcoal, and the Brazilian state Minas Gerais presents the greater production of said product. The wood proprieties influence the charcoal quality, making important to know them, it is known that these proprieties vary according to the age of the tree. With that being said, this research aimed to determine the correlations existing between age, the proprieties of the wood and charcoal proprieties. Three Eucalyptus sp. clones from Gerdau S/A were evaluated, at four ages, 3, 4, 5 and 7. From each tree, five discs were removed (0%, 25%, 50%, 75% and 100% corresponding to the commercial height of the trunk). We determined the core/sapwood relationship, basic density, chemical composition of the wood, the calorific value of the wood and of the charcoal, the gravimetric yields, apparent relative density and charcoal chemical analysis, in addition to the analysis of the condensable and non-condensable gases. Correlations between age, proprieties of the wood and charcoal were performed. It was observed a negative correlation between the age of the wood and charcoal ashes content, regardless the clones evaluated. A positive correlation between the basic density of the wood and the apparent density of the coal and a positive correlation between the lignin of wood content and the coal apparent density were observed, as well. The siringil/guaiacil relation, which determines the quantity of each type of lignin existent on the wood, presented a negative correlation with the gravimetric yields in charcoal. Therefore, it is concluded that the age of the tree influenced the proprieties of the wood, regardless the clone; the age of the genetic material did not influence the gravimetric yield in charcoal; the GG 680 clone presented greater potential to produce charcoal, considering only the proprieties of the wood.Key words: Wood technology; Proprieties of the wood; Carbonization. CORRELAÇÕES ENTRE IDADE E QUALIDADE DA MADEIRA E QUALIDADE DO CARVÃO VEGETAL DE CLONES DE EUCALIPTORESUMO -O Brasil é o maior produtor de carvão vegetal, sendo que Minas Gerais se destaca como o estado com maior produção desse produto. As propriedades da madeira influenciam a qualidade do carvão vegetal, sendo importante conhecê-las, sabendo-se que essas propriedades sofrem variação com a idade da árvore. Sendo assim, este trabalho teve como objetivo determinar as correlações existentes entre idade, as propriedades da madeira e as propriedades do carvão vegetal. Foram avaliados três clones de Eucalyptus sp., em quatro idades, aos 3, 4, 5 e 7 anos, sendo provenientes da Gerdau S/A. De cada árvore foram retirados cinco discos (0%, 25%, 50%, 75%, 100% da altura comercial do tronco), e foram determinadas a relação cerne/alburno, 552Revista Árvore, Viçosa-MG, v.40, n.3, p.551-560, 2016 CASTRO, A.F.N.M. et al.densidade básica, composição química da madeira, poder calorífico superior da madeira e do carvão vegetal, rendimentos gravimétricos, densidade relativa aparente e análise química imediata do carvão vege...

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Caracterização anatômica da madeira de sete espécies da amazônia com vistas à produção de energia e papel

Cited by 24 publications

References 3 publications

Regional Variations in Biomass Distribution in Brazilian Savanna Woodland

Regional Variations in Biomass Distribution in Brazilian Savanna Woodland

Morfometria das fibras das folhas de Astrocaryum murumuru var. murumuru Mart. (ARECACEAE)

Correlations Between Age, Wood Quality and Charcoal Quality of Eucalyptus Clones

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