Modeling Wood Characteristics

Burkhart, Harold E.; Tomé, Margarida

doi:10.1007/978-90-481-3170-9_17

Cited by 2 publications

(1 citation statement)

References 61 publications

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“…A number of different linear and non-linear models have been used to predict radial trends in wood density, microfibril angle and modulus of elasticity, with the aim of improving forest resource characterisation (Burkhart and Tomé 2012;Maeglin 1987). Radial trends have been modelled for a range of species, but the majority of research has focused on conifers (Burdon et al 2004;Maeglin 1987;Moore et al 2014;Sattler et al 2014;Zobel and van Buijtenen 1989).…”

Section: Introductionmentioning

confidence: 99%

Radial variation in modulus of elasticity, microfibril angle and wood density of veneer logs from plantation-grown Eucalyptus nitens

Vega

Hamilton

Downes³

et al. 2020

Annals of Forest Science

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& Key message Radial variation of wood properties affects product recovery from veneer logs. In Eucalyptus nitens, the radial variation in wood density, microfibril angle and modulus of elasticity was described using non-linear models. The timing of radial change was trait-dependent, and the age at which thresholds for structural products were reached differed between sites. & Context Eucalyptus nitens is widely planted in cool temperate regions of the world. While mainly grown for pulpwood, rotarypeeled veneer is becoming important. Threshold levels of wood stiffness are required for using this veneer for structural purposes. Stiffness is determined by wood density and microfibril angle, which improve with tree age. The nature of this radial variation affects the recovery of suitable veneer and profitability of the plantation resource. & Aims We model the radial variation of these veneer-critical wood properties and determine whether it varies with growing conditions. & Methods We used logs from three 20-22-year-old Tasmanian plantations. Radial variations in wood density, microfibril angle and modulus of elasticity (measuring stiffness) were assessed using SilviScan. Eight linear and non-linear models were examined using cambial age as the independent variable. & Results The increases in wood density and modulus of elasticity with age were modelled by sigmoidal functions and the decrease in microfibril angle modelled by an asymptotic function. The timing of radial change was trait-dependent, and the mean ages at which thresholds for structural products were reached between sites. & Conclusion Radial variation varied among sites and will likely impact the recovery of structural grade veneer from plantations.

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Section: Introductionmentioning

confidence: 99%

Radial variation in modulus of elasticity, microfibril angle and wood density of veneer logs from plantation-grown Eucalyptus nitens

Vega

Hamilton

Downes³

et al. 2020

Annals of Forest Science

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Models for predicting the within-tree and regional variation of tracheid length and width for plantation loblolly pine

Dahlen

Nabavi

Auty

et al. 2020

Forestry: An International Journal of Forest Research

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Loblolly pine is a major fibre source for the pulp and paper industry. Here we developed the first nonlinear models to predict the within-tree and regional variation of tracheid length and width for planted loblolly pine. Data were obtained from macerated tracheids and near-infrared spectroscopy calibration models from trees sampled in 109 stands across the southeastern United States. The fixed effects for the final tracheid length model, which included cambial age, height of disk within tree, and physiographic region, explained 71 percent of the variation with root mean square error (RMSE) of 0.28 mm, while the fixed effects for the final tracheid width model explained 57 percent of the variation with RMSE of 1.4 μm. There was significant variation in tracheid properties across the growing regions. Tree maps showing within-tree variability in tracheid properties were produced. Five simulated scenarios were compared using the models developed, with mean tracheid dimensions calculated on a whole-tree basis at a first and second thinnings, and at final harvest. Also from the final harvest, the tops of trees, and outerwood chips produced during lumber manufacturing were also simulated. For the whole tree scenarios, both mean tracheid length and width increased with age, increasing from 2.24 mm and 40.5 μm (age 12), to 2.51 mm and 41.3 μm (age 18), and to 2.73 and 41.8 μm at age 25, respectively. The tops of the trees at age 25 had a mean tracheid length of 2.46 mm and a mean width of 41.0 μm, while the chips had a mean tracheid length of 3.13 mm and a mean width of 42.5 μm. Due to the models representing samples collected from across the southeastern United States, and their relatively high precision, they are suitable for incorporation into growth and yield systems allowing for prediction of tracheid properties.

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Modeling Wood Characteristics

Cited by 2 publications

References 61 publications

Radial variation in modulus of elasticity, microfibril angle and wood density of veneer logs from plantation-grown Eucalyptus nitens

Radial variation in modulus of elasticity, microfibril angle and wood density of veneer logs from plantation-grown Eucalyptus nitens

Models for predicting the within-tree and regional variation of tracheid length and width for plantation loblolly pine

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