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Stem eccentricity, crown dry mass distribution, and longitudinal growth strain of plantation-grown Eucalyptus nitens after thinning


Medhurst, J and Ottenschlaeger, M and Wood, M and Harwood, C and Beadle, C and Valencia, JC, Stem eccentricity, crown dry mass distribution, and longitudinal growth strain of plantation-grown Eucalyptus nitens after thinning, Canadian Journal of Forest Research, 41, (11) pp. 2209-2218. ISSN 0045-5067 (2011) [Refereed Article]

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Copyright 2011 NRC Research Press

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DOI: doi:10.1139/X11-135


Silvicultural treatments that aim to improve tree growth rates also have the potential to alter physical characteristics of the tree stem and thus affect the recovery of solid-wood products. We tested the hypothesis that manifest crown asymmetry in thinned Eucalyptus nitens (Deane & Maiden) Maiden plantations was affecting the development of stem shape. The crown and stem characteristics of 15 E. nitens trees, from a 22-year-old thinning trial in northeastern Tasmania were examined. The trial had been thinned 16 years previously. Lowering the intensity of local intraspecific competition through thinning increased the crown dry mass in the north-facing aspect. No direct link was found between crown dry mass distribution and stem eccentricity. The direction of pith eccentricity at 3.0 m height was confined to the northwest and southeast sectors and averaged 11%; the degree of noncircularity in stems at 3.0 m height was strongly related to the ratio of stem diameter to total height squared. These results suggest that the dynamic loading from wind exposure plays a greater role in determining the extent and direction of pith eccentricity and stem cross-sectional circularity in E. nitens than does the static load from asymmetrical crown dry mass distribution.

Item Details

Item Type:Refereed Article
Keywords:stem eccentricity, crown dry mass, longitudinal growth strain Eucalyptus nitens, silviculture, pith, dynamic wind load
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Forestry sciences
Research Field:Forestry management and environment
Objective Division:Plant Production and Plant Primary Products
Objective Group:Environmentally sustainable plant production
Objective Field:Environmentally sustainable plant production not elsewhere classified
UTAS Author:Medhurst, J (Dr Jane Medhurst)
UTAS Author:Beadle, C (Dr Christopher Beadle)
ID Code:78092
Year Published:2011
Web of Science® Times Cited:10
Deposited By:Plant Science
Deposited On:2012-06-14
Last Modified:2014-11-07

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