Estimation of taper rates and volume of smaller-sized logs in spotted gum saw timber plantations in Southeast Queensland, Australia

Maraseni, T. N. and Cockfield, G. and Apan, A. (2007) Estimation of taper rates and volume of smaller-sized logs in spotted gum saw timber plantations in Southeast Queensland, Australia. Southern Forests: A Journal of Forest Science, 69 (3). pp. 169-173. ISSN 1991-931X

Abstract

Spotted gum (Corymbia citriodora subspecies Variegata) is a popular tree species for hardwood saw timber plantations in Southeast Queensland (SEQ), Australia. In many parts of the world, logs up to 10 cm top diameter are considered to be merchantable logs and acceptable at sawmills. However, due to the higher handling costs of smaller size logs, sawmills in SEQ are only buying logs with a top diameter of 25 cm and larger. This necessitates the determination of the volume of logs with top diameters between 10 cm and 25 cm. This paper compares the taper rates of different sizes of spotted gum logs and estimates the stem volume of spotted gum logs between 10 and 24.94 cm diameter. Analysis showed that there is a statistically significant difference between the mean taper rates of bottom (30.5 - 64.2 cm diameter) and top parts of stems (10 - 24.94 cm diameter) at harvesting age. Using only the average taper rate of large diameter logs would underestimate the log volume of smaller diameter logs. The average length of spotted gum logs between 10 and 24.94 cm was found to be 19.27 m. Therefore, by the sawmill declining to use 10 to 24.94 cm diameter logs, approximately 0.55 m3 of log volume per tree at harvesting age would be lost.


Statistics for USQ ePrint 4021
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Awaiting copyright advice.
Depositing User: Mr Tek Maraseni
Faculty / Department / School: Historic - Faculty of Business - No Department
Date Deposited: 28 Mar 2008 00:16
Last Modified: 02 Jul 2013 23:00
Uncontrolled Keywords: spotted gum; taper; merchantable wood volume; Southeast Queensland
Fields of Research (FOR2008): 06 Biological Sciences > 0607 Plant Biology > 060705 Plant Physiology
07 Agricultural and Veterinary Sciences > 0705 Forestry Sciences > 070510 Wood Processing
07 Agricultural and Veterinary Sciences > 0705 Forestry Sciences > 070506 Forestry Product Quality Assessment
Socio-Economic Objective (SEO2008): B Economic Development > 82 Plant Production and Plant Primary Products > 8201 Forestry > 820101 Hardwood Plantations
Identification Number or DOI: doi: 10.2989/SHFJ.2007.69.3.6.356
URI: http://eprints.usq.edu.au/id/eprint/4021

Actions (login required)

View Item Archive Repository Staff Only