Efeito do desbaste nas rachaduras de topo das toras de &lt;i&gt;Eucalyptus grandis&lt;/i&gt; W. Hill ex Maiden

Trevisan, Rômulo; Haselein, Clóvis Roberto; Santini, Élio José; Denardi, Luciano; Gatto, Darci Alberto

doi:10.5902/1980509813336

Cited by 2 publications

(4 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Clones D and E exhibited statistically lower LES values in all three moments evaluated compared to the other clones. Results found in this research are in accordance with other studies, where values between 0.15% and 3.5% were obtained in assessments between the 4 th and 6 th day after cutting in E. urophylla and E. grandis clones with ages between 9 and 29 years old (Schacht et al 1998;Lopes et al 2004;Trevisan et al 2013).…”

Section: Resultssupporting

confidence: 93%

“…The correlation was significant only for the evaluation at 1 week after harvesting (r = 0.447), due to the greater relief of growth stresses in the form of splits after a week. Similar results were found in studies that reported the same relationship in eucalyptus logs and for other species (Aguiar and Jankowsky 1986;Lima et al 2004;Trevisan et al 2013). Figure 7 shows correlations for MAD and IGI with LES.…”

Section: Resultssupporting

confidence: 87%

“…For LES measurements, logs 1 and 3 were used. This study followed the methodology proposed by Wilson (1985) and used by Schacht et al (1998), Lopes et al (2004) and Trevisan et al (2013), which consists of grouping the splits in the cross-section in four different classes based on its length. Table 3 shows the classification of end split length according to Wilson (1985).…”

Section: Growth Stress Indicatormentioning

confidence: 99%

See 2 more Smart Citations

Effect of growth stress and interlocked grain on splitting of seven different hybrid clones ofEucalyptus grandis×Eucalyptus urophyllawood

França

Vidaurre

2020

Holzforschung

View full text Add to dashboard Cite

Trees with high levels of growth stress begin to show log end splits (LES) immediately after harvesting, usually reaching its maximum end split in a week, and these tensions also create splits during lumber manufacturing. Interlocked grain is another characteristic that impacts the properties of eucalyptus wood. The aim of this study was to evaluate the effect of growth stress and interlocked grain patterns on log end splitting of seven different hybrid clones of Eucalyptus grandis × Eucalyptus urophylla planted in Brazil. The growth stress indicator (GSI) was measured in standing trees before harvesting. Splits were measured on logs in three different stages, and interlocked grain from wood blocks was obtained across the center of the cross-section. The results showed that LES occurred as soon as the trees were harvested; however, for better selection of clones, LES should be evaluated after a week of harvesting. There were statistically significant correlations for GSI with LES. Clones that presented higher values of interlocked grain tended to develop lower values of GSI and LES. Using GSI and interlocked grain measurements, it was possible to select the most indicated eucalyptus clones for lumber production.

show abstract

Section: Resultssupporting

confidence: 93%

Section: Resultssupporting

confidence: 87%

Section: Growth Stress Indicatormentioning

confidence: 99%

See 1 more Smart Citation

Effect of growth stress and interlocked grain on splitting of seven different hybrid clones ofEucalyptus grandis×Eucalyptus urophyllawood

França

Vidaurre

2020

Holzforschung

View full text Add to dashboard Cite

show abstract

“…Entretanto, o IRTT das duas espécies não diferenciou-se estatisticamente (Tabela 1). A incidência deste defeito nas toras de mogno africano foi inferior a delimitada para toras de E. grandis, de 21 e 18 anos de idade, por Lima, Garcia e Stape (2007), e Trevisan et al (2013), respectivamente.…”

unclassified

Qualidade da madeira de mogno africano para a produção de serrados

Silva¹,

Vidaurre²,

Arantes³

et al. 2016

Sci. For.

View full text Add to dashboard Cite

ResumoO objetivo deste trabalho foi avaliar a deformação residual longitudinal, o índice de rachaduras (de topo de toras e tábuas), o deslocamento da medula e os defeitos de secagem nas tábuas das espécies de Khaya ivorensis e Khaya senegalensis para a produção de madeira serrada. O material foi proveniente de um plantio experimental em Linhares, ES, Brasil, sendo utilizadas cinco árvores por espécie, com 19 anos de idade. Com as árvores em pé foi realizada a leitura da deformação residual longitudinal, utilizando o méto-do CIRAD -Forêt. Após o corte das árvores, os topos inferiores das toras da base foram fotografados para a mensuração das rachaduras e do deslocamento da medula. As rachaduras de topo e os empenamentos das tábuas também foram mensurados, após a secagem. No geral, não houve diferenças significativas nas médias de deformação residual longitudinal, índice de rachaduras de toras e tábuas e deslocamento da medula entre as espécies. Todavia, a espécie Khaya ivorensis apresentou as maiores dimensões de rachaduras de topo de toras e de tábuas, enquanto, as tábuas de Khaya senegalensis apresentaram os maiores empenamentos. Os índices das variáveis avaliadas não são elevados ao ponto de inviabilizar o uso e a qualidade das duas espécies de mogno africano para a produção de madeira serrada, sendo importante ponderar, principalmente, a forma e dimensões das árvores e os defeitos da madeira serrada em regiões mais próximas da medula e em idades mais jovens. Palavras-chave:Khaya, Deformação residual longitudinal, Rachaduras, Defeitos da madeira serrada. AbstractThe aim of this work was to evaluate the longitudinal residual strain, the index of splits (end of logs and boards), the displacement of the pith and the drying defects on the boards of the species of Khaya ivorensis and Khaya senegalensis for lumber production. The material comes from an experimental plantation in Linhares, ES, Brazil, with five trees per species being utilized, at age 19 years. The reading of the longitudinal residual strain using the method CIRAD -Forêt on standing trees was taken. After cutting of the trees, the end of logs was photographed for measurement of splits and displacement of the pith. The end splits and warping of the boards were also measured, after drying. Overall, there were not statistical differences in longitudinal residual strain, index split of logs and boards and displacement of the pith between species. However, Khaya ivorensis showed the larger dimensions of end split logs and boards, while, the boards of Khaya senegalensis had higher warping. The indexes of the variables are not high to the point of rendering unfeasible the use and the wood quality of the two species of African mahogany for the lumber production. It is important to consider, however, the shape and dimensions of trees and lumber defects in regions closest of the pith and at younger ages.Keywords: Khaya, Longitudinal residual strain, Splits, Lumber defects. INTRODUÇÃOOs plantios de mogno africano têm aumentado no Brasil nos últimos anos, com o...

show abstract

Efeito do desbaste nas rachaduras de topo das toras de <i>Eucalyptus grandis</i> W. Hill ex Maiden

Cited by 2 publications

References 1 publication

Effect of growth stress and interlocked grain on splitting of seven different hybrid clones ofEucalyptus grandis×Eucalyptus urophyllawood

Effect of growth stress and interlocked grain on splitting of seven different hybrid clones ofEucalyptus grandis×Eucalyptus urophyllawood

Qualidade da madeira de mogno africano para a produção de serrados

Contact Info

Product

Resources

About