An explicit stem profile model for forked and un-forked teak (Tectona grandis) trees in West Africa

Adu‐Bredu, Stephen; Bi, Alphonse Foua Tape; Bouillet, Jean‐Pierre; Mé, Martial Kouamé; Kyei, Samuel Yamoah; Saint‐André, Laurent

doi:10.1016/j.foreco.2007.12.052

Cited by 28 publications

(19 citation statements)

References 22 publications

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“…All three lines are the predicted stem taper profiles of three trees that have almost the similar D (40-43 cm) but different total height and HCB. It clearly shows that trees with lower HCB generally have more tapered stem, which is similar to the results observed by Adu-Bredu et al (2008), and MacFarlane and Weiskittel …”

Section: Stem Tapersupporting

confidence: 88%

Modeling taper and volume of Sal (Shorea robusta Gaertn. f.) trees in the western Terai region of Nepal

Silwal¹,

Baral

Chhetri

2018

Banko

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Volume and taper equations are used for estimating timber volume and biomass of a tree. Despite their usefulness, precise and site specific equations are still lacking for commercially important tree species in Nepal. The study was carried out at Chandak Chatiya Mahila Community Forest in Bardia district and Lumbini Collaborative Forest of Saljhandi in Rupandehi district in western Terai of Nepal. A destructive sampling method was used and selected fifteen Sal trees (Shorea robusta Gaertn. f.) from Saljhandi (site 1) and eighteen trees from Bagnaha (site 2) randomly to calibrate an individual tree volume and a stem taper function. At first, a non-linear stem taper function was calibrated using stem diameters outside bark at different heights above ground as response variable and D (diameter at breast height), H (total height), h (height of interest) as predictors. Then, effect of crown characteristics on stem taper was evaluated. As stem HCB (height to crown base) was found to affect stem taper, its usefulness in existing stem volume equation was tested. Empirical relationships between V (stem volume) as a response variable and D, H, HCB and sites in Bardia and Rupandehi districts as predictors were established using a linear mixed modeling approach. Our result showed that, instead of H, use of HCB in stem volume equation increased model prediction accuracy and reduced prediction bias. Applicability of the suggested models for predicting individual S. robusta tree volume and stem taper is discussed.

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Section: Stem Tapersupporting

confidence: 88%

Modeling taper and volume of Sal (Shorea robusta Gaertn. f.) trees in the western Terai region of Nepal

Silwal¹,

Baral

Chhetri

2018

Banko

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“…38 -0. 43 for teak trees planted in Ghana and Ivory Coast, in an age interval of 1 to 19 years (Adu-Bredu et al, 2008). In comparison, the Schumacher-Hall total volume model implied in the taper function produced, in average, the equivalent to a constant shape factor of 0.…”

Section: Modelo Función 1 Zhang Et Al (2002)mentioning

confidence: 93%

“…Nevertheless, in species with a high timber value, it is more helpful and relevant to know the distribution of their products according to their industrial and commercial use, for this will allow a better assessment of the CFP (Adu-Bredu et al, 2008). For this purpose, taper functions are used which provide an accurate description of the diametric profile of the stem and facilitate the estimation of the product distribution at any limit for merchantable diameter or length (Diéguez-Aranda et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…No obstante, en especies de alto valor maderable es más útil y relevante conocer su correspondiente distribución de productos según el uso industrial y comercial, pues con ello se está en la posibilidad de efectuar una mejor valoración de la PFC (Adu-Bredu et al, 2008). Para tal propósito, se recurre a funciones de ahusamiento que describan con precisión el perfil diamétrico del fuste y facilitan el cálculo de la distribución de productos a cualquier límite en diámetro o altura comercial (Diéguez-Aranda et al, 2009).…”

Section: Introductionunclassified

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SISTEMA DE CUBICACIÓN PARA ÁRBOLES INDIVIDUALES DE Tectona grandis L. f. MEDIANTE FUNCIONES COMPATIBLES DE AHUSAMIENTO-VOLUMEN

Tamarit-Urias

Posadas

Aldrete

et al. 2018

RMCF

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RESUMENSe construyó un sistema de cubicación de árbol individual generado a partir de una función segmentada de ahusamiento para plantaciones de Tectona grandis establecidas en Campeche, Tabasco y Chiapas. Se cubicaron 144 árboles de diferentes edades; para cada uno se midió el diámetro con corteza y la altura sobre el fuste a 1 m después del tocón hasta la altura total. Se evaluó el ajuste estadístico de seis funciones segmentadas de ahusamiento y se seleccionó al modelo de Fang como el mejor por presentar la mayor precisión, el menor sesgo y por describir el ahusamiento del fuste correctamente. De forma simultánea se le hizo un ajuste con su respectiva función de volumen comercial basado en la técnica de modelo de efectos mixtos, con lo que se logró controlar la variación específica a nivel de árbol, mejorar la estimación de los parámetros y la precisión de las predicciones. Los resultados indican que el sistema de cubicación derivado se conforma de ecuaciones que describen con exactitud el perfil fustal y estiman el volumen comercial y total, así como la altura comercial a un diámetro mínimo y viceversa. Los puntos de cambio en la forma dendrométrica del fuste son similares a los de otras especies de árboles latifoliados. El equivalente al factor de forma que procede del modelo de volumen total fue de 0.43 en promedio y permite realizar estimaciones muy cercanas a los volúmenes observados; comparativamente es inferior al calculado para esta especie en otras regiones tropicales.Palabras clave: Altura comercial, diámetro mínimo, modelos segmentados de ahusamiento, Tectona grandis L. f., volumen total, volumen comercial. ABSTRACTA volume estimation system for individual trees was generated based on a segmented taper function for Tectona grandis plantations established in Campeche, Tabasco and Chiapas. The volume of 144 trees of different ages was estimated; for each, the diameter with bark was measured, as was the height above the stem base from 1 m above the stump to the total height. The statistical adjustment of six segmented taper functions was assessed, and the model of Fang was selected as the best, since it is the most accurate, the one with least bias and provides a correct description of the stem taper. An adjustment was simultaneously made with its respective merchantable volume function based on the mixed effect model technique, whereby the specific variation was controlled at tree level, and the estimation of the parameters and the accuracy of the predictions were improved. The results indicate that the derived volume estimation system consists of equations that accurately describe the stem profile and estimate the merchantable and total volumes, as well as the merchantable length at a minimum diameter and vice versa. The points of change in the dendrometric stem shape are similar to those of other broadleaf tree species. The equivalent of the shape factor from the total volume model was 0. 43 in average, which allows estimations that are very close to the observed volumes and is comparatively lower ...

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“…Various approaches have been used to model the effect of crown architecture on stem taper variation such as the inclusion of crown characteristics as independent variables in stem taper curves [25,52,53]; using different models above and below a relative crown height [3,54] or modelling the effect of crown size on the centroid of volume for different trees [2].…”

Section: Introductionmentioning

confidence: 99%

Compatible System for Predicting Total and Merchantable Stem Volume over and under Bark, Branch Volume and Whole-Tree Volume of Pine Species

Corral-Rivas

Vega-Nieva

Rodríguez‐Soalleiro

et al. 2017

Forests

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Accurate quantification of branch volume in trees is important for sustainable forest management, especially as these fractions are increasingly used for bioenergy, and for precise forest CO 2 quantification. Whereas a large focus has been placed on the compatible estimation of tree taper and bole volume with and without bark, little effort has been made to develop models that allow a simultaneous prediction of these variables together with tree branch volume. In this study, 595 Pinus cooperi trees and 700 Pinus durangensis trees were sampled in pine-oak forests in the Sierra Madre Occidental, Mexico. A compatible system for predicting two segmented taper functions, over and under bark; the corresponding merchantable volumes; coarse branch volume and whole-tree volume was fitted using a modified continuous autoregressive structure to account for autocorrelation. The proposed compatible equations explained more than 97% of the observed variability in diameter over and under bark, volume over and under bark, and total tree volume and more than 64% of the observed variability in branch volume in both species. The method described can theoretically be replicated for any tree species, thus providing a better understanding of the patterns of volume distribution by components, potentially improving carbon accounting system and forest bioenergy planning.

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An explicit stem profile model for forked and un-forked teak (Tectona grandis) trees in West Africa

Cited by 28 publications

References 22 publications

Modeling taper and volume of Sal (Shorea robusta Gaertn. f.) trees in the western Terai region of Nepal

Modeling taper and volume of Sal (Shorea robusta Gaertn. f.) trees in the western Terai region of Nepal

SISTEMA DE CUBICACIÓN PARA ÁRBOLES INDIVIDUALES DE Tectona grandis L. f. MEDIANTE FUNCIONES COMPATIBLES DE AHUSAMIENTO-VOLUMEN

Compatible System for Predicting Total and Merchantable Stem Volume over and under Bark, Branch Volume and Whole-Tree Volume of Pine Species

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