Wood Permeability in Eucalyptus grandis and Eucalyptus dunnii

Abstract

The objective of this study was to evaluate the flow of air and water in Eucalyptus grandis and Eucalyptus dunnii wood. Wood was collected from four trees aged 37 years in an experimental plantation of the Federal University of Lavras, Brazil. Planks were cut off the basal logs to produce specimens for air and water permeability testing. Results indicated that the longitudinal permeability to air and water of E. grandis wood were, on average, 5% and 10% higher, respectively, than that of E. dunnii wood. E. grandis and E. dunnii wood showed neither air nor water flow in the test for permeability transversal to the fibers, and longitudinal permeability to air exceeded that to water by approximately 50 fold in both species.

Water flow in different directions in Corymbia citriodora wood

“…The mean basic density of Corymbia citriodora wood equal to 647 kg/m 3 (Table 1) is consistent with the literature, for example, Zanuncio et al (2015) found values between 665 and 684 kg/m 3 for Corymbia citriodora wood from seven-years-old trees, and Monteiro et al (2018) report mean values of basic density for trees of the same species and age equal to 610 kg/m 3 . The comparison with the values of water flow in wood is more complex since few studies approach the rates of the free and absorbed water in a detailed way, as well as diverse methodologies, are used for measure permeability, for example, apparatus for testing the permeability to air and liquid in wood (Silva et al 2010, Tanaka et al 2010, Baraúna et al 2014, Rezende et al 2018, Brito et al 2019 and gravimetric techniques (Redman et al 2016, Thybring et al 2018.…”

“…However, the evaluation of the water flow in the wood in radial and tangential directions is complex when compared to the longitudinal axis, since their values are smaller, often imperceptible to the technique used for measurement. On the one hand, some studies record values for air and liquid permeability of hardwood only for the longitudinal axis (Silva et al 2010, Baraúna et al 2014, Rezende et al 2018, Brito et al 2019. On the other, Tanaka et al (2010) used the permeameter apparatus and ultrasonic treatment and found on Douglas-fir wood permeability higher values in the radial direction when compared to the tangential direction.…”

“…The relationship between water and wood has been scientifically studied for over a century, focusing mainly on softwoods (Engelund et al 2013). The greater importance of hardwoods in recent years, such as those from Corymbia genus, has led to increased studies on the water-wood relationship in these species (Zanuncio et al 2013, Zanuncio et al 2015, Redman et al 2016, Monteiro et al 2017, Monteiro et al 2018, Resende et al 2018, Rezende et al 2018, Brito et al 2019, Nascimento et al 2019.…”

“…Different techniques were used to evaluate water interaction with wood materials, including gravimetric techniques (Redman et al 2016, Thybring et al 2018 and apparatus for testing wood permeability to air and liquid (Silva et al 2010, Tanaka et al 2010, Baraúna et al 2014. However, different techniques to evaluate hardwood permeability have only found values for the longitudinal direction and have found difficulty in measuring this parameter in the radial and tangential axes (Silva et al 2010, Baraúna et al 2014, Rezende et al 2018, Brito et al 2019.…”

Micromorphological Observation of Eucalyptus Seeds, Multivariate Statistical Analyses and Modeling of Their Germination Under Salt Stress and Osmotic Constraint

“…are indigenous to Australia; they have been widely introduced into countries throughout the world because of their rising demand for paper and plywood (Turnbull, 1999;Cossalter and Pye-Smith, 2003). It is used in the fabrication of pulp and paper, in sawn lumber for structural purposes, engineering wood products, and flors (Rezende et al, 2018). Eucalyptus monoculture provides distinct products, such as wood, charcoal, resins, plywood, cellulosic ethanol, cellulose and paper (Takahashi et al, 2004).…”