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9.1 Wood Properties of Commercial Tree Species
Authors: T G JonesPublication: NZIF Forestry Handbook, Volume Section 9 – Utilisation of forest products, pp 1, Dec 2023
Publisher: New Zealand Institute of Forestry
Abstract: The average wood properties are given for ten indigenous species and forty-two exotic plantation-grown species in New Zealand (Table 1). Within any tree species, wood properties can vary widely with age, site, provenance, genotype and silviculture, so where possible the information refers to the preferred provenance at or near merchantable age, and at about the centre of its geographical range in New Zealand. Where data are unavailable, or the implied use is inappropriate, the symbol ‘U’ is used. The definitions for the data in Table 1 are explained in the following sections. WOOD DENSITY -Basic density: oven-dry weight of wood divided by volume when green. -Air-dry density: weight of wood divided by volume at 12% moisture content. -Green density: weight of wood divided by volume, both being measured on freshly felled timber. Green density varies widely because it is dependent on moisture content and is therefore determined by tree age, heartwood content, time since felling and storage conditions.