Equations for predicting heart wood merchantable volume and tradable sawlog in Tectona grandis

Berrocal A., . and Gaitán-�lvarez J., . and Fernández-Sólis D., . and Moya R., . and Ortiz-Malavassi E., . Equations for predicting heart wood merchantable volume and tradable sawlog in Tectona grandis. pp. 379-390. ISSN 0128-1283

Heartwood is the most important part of the Tectona grandis tree. Although various equations for prediction of this tissue are available for this species there are no models for prediction of its heartwood exclusively. The objective of the present study was to establish equations for predicting heartwood merchantable volume and tradable sawlog of teak trees growing in fast-growth plantations in Costa Rica. A total of 54 plantations were sampled from five regions of this country. Four equations were used to establish heartwood parameters using diameter at breast height (dbh) total height (H) and age as predictor variables. The equation selected for prediction of heartwood height (Hhw) and heartwood diameter (Dhw) included dbh and H. For Hhw the equation proposed was Y b‚� b‚‚H b·Age b4dbh with coefficients of determination (r) of 0.87 while the stem profile equation to determine the different values of external diameter was dub a‚dbha Ha2XM with r 0.94 and the equation to determine the Dhw was -4.83 0.190d where d was any given external diameter of a tree. The selected equation could be used to predict total and commercial heartwood and quantity of sawlog of trees from plantation of T. grandis.

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Abstract

Heartwood is the most important part of the Tectona grandis tree. Although various equations for prediction of this tissue are available for this species there are no models for prediction of its heartwood exclusively. The objective of the present study was to establish equations for predicting heartwood merchantable volume and tradable sawlog of teak trees growing in fast-growth plantations in Costa Rica. A total of 54 plantations were sampled from five regions of this country. Four equations were used to establish heartwood parameters using diameter at breast height (dbh) total height (H) and age as predictor variables. The equation selected for prediction of heartwood height (Hhw) and heartwood diameter (Dhw) included dbh and H. For Hhw the equation proposed was Y b‚� b‚‚H b·Age b4dbh with coefficients of determination (r) of 0.87 while the stem profile equation to determine the different values of external diameter was dub a‚dbha Ha2XM with r 0.94 and the equation to determine the Dhw was -4.83 0.190d where d was any given external diameter of a tree. The selected equation could be used to predict total and commercial heartwood and quantity of sawlog of trees from plantation of T. grandis.

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Item Type:	Article
AGROVOC Term:	Tectona grandis
AGROVOC Term:	Teak
AGROVOC Term:	Timber
AGROVOC Term:	Prediction
AGROVOC Term:	Heartwood
AGROVOC Term:	Breast height diameter
AGROVOC Term:	Height
AGROVOC Term:	Age
AGROVOC Term:	Sawlogs
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:54
URI:	http://webagris.upm.edu.my/id/eprint/9334

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