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

journal contribution
posted on 2023-05-20, 20:11 authored by Vega, M, Hamilton, M, Downes, G, Peter HarrisonPeter Harrison, Bradley PottsBradley Potts

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.

Funding

Australian Research Council

Forest & Wood Products Australia Limited

Forestry Tasmania

Forico Pty Ltd

Greening Australia (TAS) Ltd

JM Roberts Charitable Trust

Sustainable Forest Management Pty Ltd

History

Publication title

Annals of Forest Science

Volume

77

Article number

65

Number

65

Pagination

1-15

ISSN

1286-4560

Department/School

School of Natural Sciences

Publisher

E D P Sciences

Place of publication

7, Ave Du Hoggar, Parc D Activites Courtaboeuf, Bp 112, Les Ulis Cedexa, France, F-91944

Rights statement

Copyright 2020 INRAE and Springer-Verlag France SAS, part of Springer Nature

Repository Status

  • Restricted

Socio-economic Objectives

Hardwood plantations

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