Analysis of spacing for spotted gum plantations for maximising merchantable logs' volume in South East Queensland, Australia

Maraseni, Tek Narayan and Cockfield, Geoff and Apan, Armando (2007) Analysis of spacing for spotted gum plantations for maximising merchantable logs' volume in South East Queensland, Australia. In: IUFRO 3.08 Conference: Improving The Triple Bottom Line Returns From Small-scale Forestry, 17-21 June 2007, Ormoc City, Leyte, the Philippines.


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Spotted gum (Corymbia citriodora subspecies Variegata) has the potential to be the major hardwood species for large-scale plantations in South East 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 is analysed for five spacing levels: ─11.3 m x 11.3 m (78 stems per hectare), 7.4 m x 7.4 m (182 sph), 5.4 m x 5.4 m (343 sph), 3.6 m x 3.6 m (771 sph) and 2.9 m x 2.9 m (1189 sph). The major objective was assumed to be to maximise 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 levels at a range of harvesting ages was estimated. From the analysis, the spacing level of 5.4 m x 5.4 m was found to be optimal for maximising merchantable log volume to 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 maximised by retaining the 250 largest trees per hectare. The total financial revenue from the best spacing level in 25 and 30 years are predicted to be $13,637 and $17,779 per hectare, 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: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Faculty / Department / School: Historic - Faculty of Business - School of Accounting, Economics and Finance
Date Deposited: 11 Oct 2007 01:18
Last Modified: 05 Nov 2017 23:45
Uncontrolled Keywords: spotted gum, Corymbia citriodora subspecies Variegata, spacings, merchantable log volume, Southeast Queensland
Fields of Research : 14 Economics > 1402 Applied Economics > 140201 Agricultural Economics
14 Economics > 1402 Applied Economics > 140205 Environment and Resource Economics

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