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Species-Specific Allometric Equations for Predicting Belowground Root Biomass in Plantations - Case Study of Spotted Gums (Corymbia citriodora subspecies variegata) in Queensland2.33 MB
Published VersionCC BY V4.0, Open Access
Journal article
Species-Specific Allometric Equations for Predicting Belowground Root Biomass in Plantations: Case Study of Spotted Gums (Corymbia citriodora subspecies variegata) in Queensland
Forests, Vol.12(9), pp.1-17
2021
Abstract
Spotted gum (Corymbia citriodora spp. variegata; CCV) has been widely planted, has a wide natural distribution, and is the most important commercially harvested hardwood species in Queensland, Australia. It has a great capacity to sequester carbon, thus reducing the impact of CO2 emissions on climate. Belowground root biomass (BGB) plays an important role as a carbon sink in terrestrial ecosystems. To explore the potential of biomass and carbon accumulation belowground, we developed and validated models for CCV plantations in Queensland. The roots of twenty-three individual trees (size range 11.8–42.0 cm diameter at breast height) from three sites were excavated to a 1-m depth and were weighed to obtain BGB. Weighted nonlinear regression models were most reliable for estimating BGB. To evaluate the candidate models, the data set was cross-validated with 70% of the data used for training and 30% of the data used for testing. The cross-validation process was repeated 23 times and the validation of the models were averaged over 23 iterations. The best model for predicting spotted gum BGB was based on a single parameter, with the diameter at breast height (D) as an independent variable. The best equation BGB = 0.02933 × D2.5805 had an adjusted R2 of 0.854 and a mean absolute percentage error of 0.090%. This equation was tested against published BGB equations; the findings from this are discussed. Our equation is recommended to allow improved estimates of BGB for this species.
Details
- Title
- Species-Specific Allometric Equations for Predicting Belowground Root Biomass in Plantations: Case Study of Spotted Gums (Corymbia citriodora subspecies variegata) in Queensland
- Authors
- Trinh Huynh (Author) - University of the Sunshine Coast, Queensland, Forest Industries Research CentreGrahame Applegate (Author) - University of the Sunshine Coast, Queensland, Forest Industries Research CentreTom Lewis (Author) - University of the Sunshine Coast, Queensland, Forest Industries Research CentreAnibal Nahuel A Pachas (Author) - University of the Sunshine Coast, Queensland, Forest Research InstituteMark A Hunt (Author) - University of TasmaniaMila Bristow (Author) - Plant Health Australia (Australia)David J Lee (Author) - University of the Sunshine Coast, Queensland, Forest Research Institute
- Publication details
- Forests, Vol.12(9), pp.1-17
- Publisher
- MDPI AG
- Date published
- 2021
- DOI
- 10.3390/f12091210
- ISSN
- 1999-4907
- Copyright note
- Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
- Organisation Unit
- Tropical Forests and People Research Centre; University of the Sunshine Coast, Queensland; Forest Industries Research Centre; Forest Research Institute
- Language
- English
- Record Identifier
- 99568107502621
- Output Type
- Journal article
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