Models for estimating volume of Tectona grandis at Longuza and Mtibwa forest plantations in Tanzania

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dc.contributor.authorMugasha,W.A
dc.contributor.authorZahabu,E
dc.contributor.authorMalimbwi,R.E
dc.date.accessioned2025-08-11T12:29:12Z
dc.date.available2025-08-11T12:29:12Z
dc.date.issued2025
dc.descriptionJournal Article
dc.description.abstractThis study aimed to develop and validate allometric equations for estimating total and merchantable volumes of teak (Tectona grandis L. f.) trees in two major statemanaged forest plantations in Tanzania, Longuza in the Tanga Region and Mtibwa in the Morogoro Region. It addresses the existing gap of the absence of accurate volume models required for the reliable estimation of total teak tree volume, which is critical for effective forest management and planning. A total of 177 destructively sampled trees were used to fit non-linear regression models incorporating diameter at breast height (D) and total height (H) as predictor variables. Site-specific and general models were developed and evaluated. Models that included both D and H outperformed those based solely on D, providing more unbiased volume estimates across diameter classes and sites. The bestperforming models exhibited high explanatory power (R² ≥ 0.96) and low prediction errors (PE% < 3%). The H-D relationship reveals differences in tree allometry between the two sites, with taller trees on average in Longuza than in Mtibwa. The site-specific H-D and volume equations are recommended where available. In the absence of such models, the generalised equations developed herein provide a reliable alternative across teak plantations in Tanzania.
dc.identifier.urihttps://www.suaire.sua.ac.tz/handle/123456789/6919
dc.language.isoen
dc.publisherTanzania Journal of Forestry and Nature Conservation
dc.subjectVolume equations
dc.subjectTeak forest plantations
dc.subjectNon-linear model
dc.subjectTree diameter and height relationship
dc.subjectLunguza and Mtibwa
dc.titleModels for estimating volume of Tectona grandis at Longuza and Mtibwa forest plantations in Tanzania
dc.typeArticle

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