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Small-tree volume equations for subtropical hardwood plantation species

Hogg, B. W., Lewis, T., Huth, J. R. and Lee, D. J. (2021) Small-tree volume equations for subtropical hardwood plantation species. Australian Forestry, 84 (3). pp. 152-158. ISSN 0004-9158

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Article Link(s): https://doi.org/10.1080/00049158.2021.1961417

Abstract

Estimation of stem volume is needed to determine timber yield and forest carbon, but equations to estimate volume from easily assessed inventory measures are lacking for hardwood plantation species in the subtropics. We assessed the merits of three volume equations that combine measurements of tree diameter at breast height (DBH) and total tree height for five hardwood plantation taxa (Corymbia citriodora subsp. variegata, Corymbia hybrids, Eucalyptus cloeziana, E. longirostrata and E. dunnii). Goodness-of-fit statistics indicated that model 1 (comprehensive combined variable equation) and model 2 (the Schumacher and Hall equation) fitted the data well (e.g. adjusted R2 > 98). Analysis of bias in different diameter classes indicated that these models did not show any systematic bias patterns with tree size. Model 3 (combined variable volume equation) is the least desirable as it showed evidence of overestimation of volume for larger trees in some taxa. Models 1 and 2 provide a useful initial set of volume equations for five potentially important hardwood plantation species in subtropical Queensland. These equations are based on stems with a DBH range of 5?30 cm and hence there is a need to collect data for larger stems (>30 cm DBH) as existing plantations mature.

Item Type:Article
Business groups:Horticulture and Forestry Science
Subjects:Forestry > Research. Experimentation
Forestry > Forestry management
Forestry > Exploitation and utilization
Deposited On:21 Oct 2021 04:13
Last Modified:21 Oct 2021 04:13

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