University Of Tasmania
147634_Thinning influences wood properties of plantation-grown Eucalyptus nitens at three sites in Tasmania.pdf (1.39 MB)

Thinning influences wood properties of plantation-grown Eucalyptus nitens at three sites in Tasmania

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journal contribution
posted on 2023-05-21, 03:58 authored by Gendvilas, V, Downes, GM, Mark Neyland, Mark HuntMark Hunt, Peter HarrisonPeter Harrison, Jacobs, A, Williams, D, Julianne O'Reilly-WapstraJulianne O'Reilly-Wapstra
Thinning of forestry plantations is a common silviculture practice to increase growth rates and to produce larger dimension logs. The wood properties, basic density and stiffness, are key indicators of the suitability of timber for particular purposes and ultimately determine timber value. The impact of thinning operations on wood properties is, therefore, of considerable interest to forest growers and timber producers. To date, studies examining the impact of thinning on wood properties have produced variable results and understanding the consistency of the effects of thinning treatments across various sites for important plantation species is limited. Two non-destructive assessment techniques, drilling resistance and acoustic wave velocity, were used to examine the impact of thinning on basic density and stiffness in 19–21-year-old plantation grown Eucalyptus nitens across three sites. Commercial thinning to 300 trees ha−1 decreased the stiffness of standing trees and this effect was consistent across the sites. Reduction in stiffness due to thinning ranged from 3.5% to 11.5%. There was no difference in wood properties between commercially and non-commercially thinned trees to 300 trees ha−1 and no difference in wood properties when thinned to 500 trees ha−1. Basic density was not affected by thinning. The site had significant effects on both basic density and stiffness, which were lowest at the highest precipitation and highest elevation site. The results indicate that wood properties are influenced both by silviculture and site environmental differences. This knowledge can be used for the better management of E. nitens resources for solid wood production.


Sustainable Timber Tasmania


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Copyright 2021 The Author(s) Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

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Socio-economic Objectives

Hardwood plantations