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Form factors and volume models for Falcataria moluccana in smallholder plantations Central Kalimantan Indonesia4.27 MB
Published VersionCC BY-NC-ND V4.0, Open Access
Journal article
Form factors and volume models for Falcataria moluccana in smallholder plantations, Central Kalimantan, Indonesia
Australian Forestry, Vol.87(3), pp.101-113
2024
Appears in UniSC Supported Open Access Outputs
Abstract
Falcataria moluccana (sengon) is grown extensively for timber production in smallholder plantations in Indonesia. However, stem form and volume information necessary for its sustainable forest management, yield estimation and carbon assessment are largely unavailable. Therefore, this study developed form factor and stem volume models for sengon trees in Central Kalimantan, Indonesia. Data were collected using a destructive method from 24 trees across six diameter classes. Two types of form factors, artificial and absolute, were determined, and their relationship with tree growth was established. Four form factor functions were fitted, and the accuracy of volume estimation using a default form factor was compared to the functions. Additionally, 11 stem volume models were developed, and their performance was compared with the commonly used published models. The form factor for sengon was estimated at 0.48, which was higher and more accurate than the absolute form factor. A linear relationship was observed between sengon tree form and growth, particularly with the artificial form factor (R-2 = 0.55-0.62). The Pollansch & uuml;tz function was identified as the best form factor function, accurately predicting form factors for precise tree volume computations. Using the default form factor of 0.5 led to an overestimation of volume by up to 17%. Among the volume models, the power models with diameter as the sole predictor (MD3: V = 0.00018 * DBH2.3817) and with both diameter and height variables (MDH4: V = 0.000095 * DBH1.9974 * H-0.6327) were the most accurate. Importantly, the models developed in this study offer improved accuracy compared to existing models from Java, which tend to overestimate stem volume. Therefore, this study provides suitable models and valuable insights for better valuation and management of smallholder sengon plantations in Central Kalimantan and other areas with similar site and stand conditions.
Details
- Title
- Form factors and volume models for Falcataria moluccana in smallholder plantations, Central Kalimantan, Indonesia
- Authors
- T. V. Oluwajuwon (Corresponding Author) - University of the Sunshine Coast, Queensland, Tropical Forests and People Research CentreM. S. Hossain (Author) - Technische Universität DresdenA. N. Ludjen (Author) - University of Palangka RayaD. P. Hasert (Author) - Fairventures Digital GmbH (Stuttgart, Germany)M. Sitanggang (Author) - Fairventures Social Forestry GmbH (Stuttgart, Germany)R. Israel (Author) - University of IbadanC. J. Offiah (Author) - University of GöttingenG. L. Alawode (Author) - University of Eastern FinlandF. N. Ogana (Author) - Virginia Tech
- Publication details
- Australian Forestry, Vol.87(3), pp.101-113
- Publisher
- Taylor & Francis Australasia
- Date published
- 2024
- DOI
- 10.1080/00049158.2024.2372125
- ISSN
- 2325-6087; 0004-9158
- Copyright note
- © 2024 The Author(s). This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way. The terms on which this article has been published allow the posting of the Accepted Manuscript in a repository by the author(s) or with their consent.
- Data Availability
- The dataset used in this study is available on reasonable request from the corresponding author.
- Grant note
- Fairventures Digital GmbH, Stuttgart, Germany
- Organisation Unit
- School of Science, Technology and Engineering
- Language
- English
- Record Identifier
- 991060768302621
- Output Type
- Journal article
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- Domestic collaboration
- International collaboration
- Web Of Science research areas
- Forestry
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