Analysis of spacing for spotted gum plantations for maximizing merchantable logs' volume in Southeast Queensland, Australia

Maraseni, Tek N. and Cockfield, Geoff and Apan, Armando (2011) Analysis of spacing for spotted gum plantations for maximizing merchantable logs' volume in Southeast Queensland, Australia. Journal of Sustainable Forestry, 30 (7). pp. 619-636. ISSN 1054-9811

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Abstract

Spotted gum (Corymbia citriodora subspecies Variegata) has the potential to be the major hardwood species for large-scale plantations in Southeast Queensland, Australia, but production research is limited due to the lack of age of research plots. Optimal spacing is a major subject of concern. Based on time series data from a spotted gum experiment site, growth performance was analyzed for five spacing levels: 11.3 m × 11.3 m (78 stems ha−1), 7.4 m × 7.4 m (182 stems ha−1), 5.4 m × 5.4 m (343 stems ha−1), 3.6 m × 3.6 m (771 stems ha−1), and 2.9 m × 2.9 m (1189 stems ha−1). The major objective was assumed to be to maximize total merchantable log volume. A growth model was produced, and the mean diameter at breast height (DBH) and total merchantable log volume for each spacing level at a range of harvesting ages were estimated. From the analysis, the spacing level of 5.4 m × 5.4 m was foundto be optimal for maximizing merchantable log volume to a 10-cm small-end diameter. Further analysis of mean DBH, height, and volume of the largest 200 and 250 trees from this spacing level indicates that merchantable log volume could be maximized by retaining the 250 largest trees ha−1. The total financial revenue from the best spacing level in 25 and 30 yr are predicted to be Australian dollars (A$) 13,637 and A$17,779 ha−1, respectively. If full rotation data could be obtained, more reliable models could be produced, and a more accurate financial estimate could be made.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version due to publisher copyright policy.
Depositing User: Mr Tek Maraseni
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - No Department
Date Deposited: 08 Nov 2011 23:29
Last Modified: 03 Jul 2013 00:51
Uncontrolled Keywords: spotted gum; spacings; merchantable log volume; hardwood plantations; Southeast Queensland
Fields of Research (FOR2008): 07 Agricultural and Veterinary Sciences > 0705 Forestry Sciences > 070504 Forestry Management and Environment
07 Agricultural and Veterinary Sciences > 0701 Agriculture, Land and Farm Management > 070105 Agricultural Systems Analysis and Modelling
07 Agricultural and Veterinary Sciences > 0705 Forestry Sciences > 070510 Wood Processing
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9609 Land and Water Management > 960999 Land and Water Management of Environments not elsewhere classified
Identification Number or DOI: doi: 10.1080/10549811.2010.550548
URI: http://eprints.usq.edu.au/id/eprint/19947

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