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Effects of site productivity on individual tree maximum basal area growth rates of Eucalyptus pilularis in subtropical Australia
Journal article   Open access   Peer reviewed

Effects of site productivity on individual tree maximum basal area growth rates of Eucalyptus pilularis in subtropical Australia

P. W. West
Journal of forestry research, Vol.34, pp.1659-1667
12/2023
DOI: https://doi.org/10.1007/s11676-023-01623-4
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Efects of site productivity on individual tree maximum basal area growth rates of Eucalyptus pilularis in subtropical Australia1.24 MBDownloadView
Published (Version of record)CC BY V4.0,  Open Access
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Abstract

Forestry Growth model Individual tree Maximum growth rate Eucalyptus pilularis Physiological effects
Inventory data were available from 96 plots of even-aged, monoculture, tall-open forests of Eucalyptus pilularis Smith, aged 2-63 years, growing in sub-tropical regions along the east coast of Australia. A model was developed relating the maximum possible stem basal area growth rate of individual trees to their stem basal area. For any tree size, this maximum increased as site productivity increased. However, the size at which this maximum occurred decreased as productivity increased. Much research has shown that, at any stand age, trees of a particular stem basal area are taller on more productive sites than on less productive ones. Taller trees incur greater respiratory costs to ensure maintenance of the photosynthetic capacity of their canopies; this reduces their growth rates. It was concluded that trees with larger basal areas will have the maximum possible growth rate on a less productive site, whilst trees with smaller basal areas will have the maximum possible on a more productive site. The model developed may constitute the first stage of a complete individual tree growth model system to predict wood yields from these forests.

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