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

Key message Radial variation of wood properties affects product recovery from veneer logs. InEucalyptus 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 nitensis widely planted in cool temperate regions of the world. While mainly grown for pulpwood, rotary-peeled 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.