Relationships between crown size and aboveground biomass of oil palms: an evaluation of allometric models

Oil palms (OP) in Sabah, Malaysia were studied to explore the relationship between canopy size and aboveground biomass (AGB). Four available allometric equations were used to calculate the dry AGB. Pearson’s correlation analysis was performed between crown diameter (CD) and crown area (CA) towards t...

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Main Authors:	Alexius Korom, Phua, Mui-How, Matsuura, Toishiya
Format:	Article
Language:	English
Published:	Penerbit Universiti Kebangsaan Malaysia 2016
Online Access:	http://journalarticle.ukm.my/9740/ http://journalarticle.ukm.my/9740/ http://journalarticle.ukm.my/9740/1/03_Alexius_Korom.pdf

id	ukm-9740
recordtype	eprints
spelling	ukm-97402016-12-14T06:50:42Z http://journalarticle.ukm.my/9740/ Relationships between crown size and aboveground biomass of oil palms: an evaluation of allometric models Alexius Korom, Phua, Mui-How Matsuura, Toishiya Oil palms (OP) in Sabah, Malaysia were studied to explore the relationship between canopy size and aboveground biomass (AGB). Four available allometric equations were used to calculate the dry AGB. Pearson’s correlation analysis was performed between crown diameter (CD) and crown area (CA) towards the variables of AGB, height and dbh. In this analysis, the transformation to natural log of variable resulted in better coefficient compared to the original one. The mean of various variables such as height (stem, total and height difference), biomass (crown, trunk and total), dbh (inner and outer) and number of petiole leaf were calculated based on 32 independent sample plots (N = 222 palms) across various age stages from 2 to 24 years. These variables were regressed against CD and age. AGB versus CD was a nonlinear with R2 ranging from 0.950 to 0.975. Random modelling and cross validation between AGB and CD was applied at the ratio of 70:30. Upon checking, the best estimation was achieved by using the allometric equation based on total height due to the lowest relative root mean square error (RMSE) (18.5%) and the least fluctuation between predicted and actual AGB. The other three models had relative RMSE that ranged between 23.9 and 68.8%. This study shows that AGB can be estimated using CD of OP consistently at all ages. Penerbit Universiti Kebangsaan Malaysia 2016-04 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/9740/1/03_Alexius_Korom.pdf Alexius Korom, and Phua, Mui-How and Matsuura, Toishiya (2016) Relationships between crown size and aboveground biomass of oil palms: an evaluation of allometric models. Sains Malaysiana, 45 (4). pp. 523-533. ISSN 0126-6039 http://www.ukm.my/jsm/malay_journals/jilid45bil4_2016/KandunganJilid45Bil4_2016.htm
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Kebangasaan Malaysia
building	UKM Institutional Repository
collection	Online Access
language	English
description	Oil palms (OP) in Sabah, Malaysia were studied to explore the relationship between canopy size and aboveground biomass (AGB). Four available allometric equations were used to calculate the dry AGB. Pearson’s correlation analysis was performed between crown diameter (CD) and crown area (CA) towards the variables of AGB, height and dbh. In this analysis, the transformation to natural log of variable resulted in better coefficient compared to the original one. The mean of various variables such as height (stem, total and height difference), biomass (crown, trunk and total), dbh (inner and outer) and number of petiole leaf were calculated based on 32 independent sample plots (N = 222 palms) across various age stages from 2 to 24 years. These variables were regressed against CD and age. AGB versus CD was a nonlinear with R2 ranging from 0.950 to 0.975. Random modelling and cross validation between AGB and CD was applied at the ratio of 70:30. Upon checking, the best estimation was achieved by using the allometric equation based on total height due to the lowest relative root mean square error (RMSE) (18.5%) and the least fluctuation between predicted and actual AGB. The other three models had relative RMSE that ranged between 23.9 and 68.8%. This study shows that AGB can be estimated using CD of OP consistently at all ages.
format	Article
author	Alexius Korom, Phua, Mui-How Matsuura, Toishiya
spellingShingle	Alexius Korom, Phua, Mui-How Matsuura, Toishiya Relationships between crown size and aboveground biomass of oil palms: an evaluation of allometric models
author_facet	Alexius Korom, Phua, Mui-How Matsuura, Toishiya
author_sort	Alexius Korom,
title	Relationships between crown size and aboveground biomass of oil palms: an evaluation of allometric models
title_short	Relationships between crown size and aboveground biomass of oil palms: an evaluation of allometric models
title_full	Relationships between crown size and aboveground biomass of oil palms: an evaluation of allometric models
title_fullStr	Relationships between crown size and aboveground biomass of oil palms: an evaluation of allometric models
title_full_unstemmed	Relationships between crown size and aboveground biomass of oil palms: an evaluation of allometric models
title_sort	relationships between crown size and aboveground biomass of oil palms: an evaluation of allometric models
publisher	Penerbit Universiti Kebangsaan Malaysia
publishDate	2016
url	http://journalarticle.ukm.my/9740/ http://journalarticle.ukm.my/9740/ http://journalarticle.ukm.my/9740/1/03_Alexius_Korom.pdf
first_indexed	2023-09-18T19:55:34Z
last_indexed	2023-09-18T19:55:34Z
_version_	1777406506193387520

Relationships between crown size and aboveground biomass of oil palms: an evaluation of allometric models

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