Development of tree volume equations for common timber species in the tropical rain forest area of Nigeria

Akindele, S. O.; LeMay, Valerie

doi:10.1016/j.foreco.2006.01.022

Cited by 97 publications

(59 citation statements)

References 19 publications

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“…In West Africa, available functions (Adekunle 2007;Akindele and LeMay 2006;Henry et al 2010;Sawadogo et al 2010;Mbaekwe and Mackenzie 2008;Onyekwelu 2004;Guendehou et al 2012) suggest that the topic has not been comprehensively addressed yet in the region. Henry et al (2011) have compiled available allometric equations for sub-Saharan Africa and already underscored that there are very few equations for the region.…”

Section: Introductionmentioning

confidence: 99%

Specific and generic stem biomass and volume models of tree species in a West African tropical semi-deciduous forest

Goussanou¹,

Guendehou²,

Assogbadjo³

et al. 2016

Silva Fenn.

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Highlights• Non-destructive sampling approach applied to derive ground truth observations and generate robust basic wood densities.• Species-specific and generic allometric equations.• Specific equations have better predictive capabilities than generic models. AbstractThe quantification of the contribution of tropical forests to global carbon stocks and climate change mitigation requires availability of data and tools such as allometric equations. This study made available volume and biomass models for eighteen tree species in a semi-deciduous tropical forest in West Africa. Generic models were also developed for the forest ecosystem, and basic wood density determined for the tree species. Non-destructive sampling approach was carried out on five hundred and one sample trees to analyse stem volume and biomass. From the modelling of volume and biomass as functions of diameter at breast height (Dbh) and stem height, logarithmic models had better predictive capabilities. The model validation showed that in absence of data on height, models using Dbh only as variable was an alternative. The comparison of basic wood densities to data published in literature enabled to conclude that the non-destructive sampling was a good approach to determining reliable basic wood density. The comparative analysis of species-specific models in this study with selected generic models for tropical forests indicated low probability to identify effective generic models with good predictive ability for biomass. Given tree species richness of tropical forests, the study demonstrated the hypothesis that species-specific models are preferred to generic models, and concluded that further research should be oriented towards development of specific models to cover the full range of dominant tree species of African forests.

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Section: Introductionmentioning

confidence: 99%

Specific and generic stem biomass and volume models of tree species in a West African tropical semi-deciduous forest

Goussanou¹,

Guendehou²,

Assogbadjo³

et al. 2016

Silva Fenn.

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“…The main advantage of this model is the ponderation factor d².h, being appropriate for the reduction of heteroscedasticity and improvement of estimates (AKINDELE and LEMAY, 2006;IGBINOSA and AMOO, 2014). Posteriorly, estimations per plot were converted to hectare by the proportionality factor of 0.8.…”

Section: Data Basementioning

confidence: 99%

“…In these forests, despite the presence of a great number of tree species, the majority is presented in rare or aggregated form (CONDIT et al, 2000) and only a few of them possess commercial interest for the lumber industry (CUNHA et al, 2016). Therefore, it is necessary to survey extensive forest areas in order to attend the increasing timber demand (AKINDELE and LEMAY, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Modeling of the Commercial Volume Stock in an Ombrophilous Forest in the Southwest of the Amazon

Cysneiros

Machado

Pelissari

et al. 2016

CERNE

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ABSTRACT:The abundance of tree species in tropical rainforests with different shapes and dimensions, as well as the great structural diversity, makes difficult the employment of form factors or equations to estimate individual volumes. However, the employment of equations at the population level makes possible to predict the volumetric stock per unit of area from forest attributes, excluding the necessity of individual tree volume evaluation. Thereby, the aim of this study was to select variables, fit statistical models and propose stand equations to estimate total and exploitable commercial volumes in an Amazon forest under concession regime. For this, variables commonly measured, like density and basal area, were inserted on traditional commercial volume models; besides the application of variables that considered the diversity and forest structure on models generated by the Stepwise process. After analysis, it was observed that the models obtained through Stepwise propitiated more precise estimation of the volumetric stock, reducing estimation errors and reducing problems with heteroscedasticity of residuals. The insertion of variables that express diversity and forest structure on the equations, like Shannon's and diametric variation indices and the commercial trees ratio, contribute to predictions' improvement, especially for the exploitable commercial volume, being recommended for the precise evaluation of timber potential of areas under Amazon forest concession. MODELAGEM DO ESTOQUE VOLUMÉTRICO COMERCIAL EM UMAFLORESTA OMBRÓFILA NO SUDOESTE DA AMAZÔNIA RESUMO: Nas florestas tropicais, a abundância de espécies arbóreas em diferentes formas e dimensões, bem como a elevada diversidade estrutural, dificulta o emprego de fatores de forma ou de equações para a estimativa de volumes individuais. Contudo, o emprego de equações de povoamento possibilita predizer o estoque volumétrico por unidade de área a partir de atributos da floresta, excluindo a necessidade da avaliação individual do volume das árvores. Com isso, o objetivo deste estudo foi selecionar variáveis, ajustar modelos estatísticos e propor equações de povoamento para a estimativa do volume comercial total e explorável em uma floresta sob regime de concessão na Amazônia. Para isso, medidas comumente mensuradas, como a densidade e a área basal, foram empregadas em modelos tradicionais da literatura; além da aplicação de variáveis que consideraram a diversidade e a estrutura florestal em modelos gerados pelo processo Stepwise. Desse modo, os modelos obtidos por Stepwise propiciaram estimativas mais precisas dos estoques volumétricos, reduzindo os erros de estimativa e reduzindo problemas de heterocedasticidade dos resíduos. Além disso, a inserção de variáveis que expressam a diversidade e a estrutura florestal nas equações, como os índices de Shannon e de variação diamétrica e a razão de indivíduos comerciais, contribuiu para a melhoria das predições, sobretudo para o volume comercial explorável, sendo então recomendadas para a avaliação precisa do pote...

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“…Esse modelo, também conhecido como modelo de Schumacher-Hall, tem sido empregado amplamente para estimação de volume de árvores, em razão de sua versatilidade, tanto para espécies crescendo em monocultivo como em plantios mistos e florestas nativas (AKINDELE; LEMAY, 2006;CHICHORRO et al, 2003;COLPINI et al, 2009;.…”

Section: Figura 1 Figureunclassified

Equações Alométricas Em Plantios Mistos Visando À Restauração Da Floresta Estacional Semidecidual

Ré

Engel

Ota

et al. 2015

CERNE

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RESUMO:Visando a suprir a lacuna do conhecimento existente sobre a estimação precisa do potencial de produção madeireira de sistemas de restauração florestal, com o presente trabalho, objetivou-se modelar as relações alométricas (hipsométricas e volumétricas) de nove espécies comuns a modelos alternativos de restauração da floresta estacional semidecidual. Os modelos se ajustaram bem aos dados coletados e a análise de resíduos indicou distribuição satisfatória, tanto para os modelos hipsométricos como volumétricos. O modelo hipsométricos de Stoeffels e o modelo volumétrico de Schumacher-Hall foram os mais flexíveis, ajustando melhor para várias espécies. Essas equações obtidas serão usadas em futuros estudos de manejo e conservação de áreas em restauração. TREE ALLOMETRIC EQUATIONS IN MIXED FOREST PLANTATIONS FOR THE RESTORATION OF SEASONAL SEMIDECIDUOUS FORESTABSTRACT: Aiming to overcome the lack of knowledge about precise estimation of wood production potential of forest restoration systems, the objective of this study is modeling allometric relationships of nine tree species in alternative models of seasonal semideciduous forest restoration. The models fitted well to the data with satisfactory distribution of the residuals. The height-diameter relationship was best modeled by the Stoeffles model and the volume equations had the best fit with the Schumacher-Hall model, for many species. The equations obtained will be used in future studies of management and conservation of these plantations.

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Development of tree volume equations for common timber species in the tropical rain forest area of Nigeria

Cited by 97 publications

References 19 publications

Specific and generic stem biomass and volume models of tree species in a West African tropical semi-deciduous forest

Specific and generic stem biomass and volume models of tree species in a West African tropical semi-deciduous forest

Modeling of the Commercial Volume Stock in an Ombrophilous Forest in the Southwest of the Amazon

Equações Alométricas Em Plantios Mistos Visando À Restauração Da Floresta Estacional Semidecidual

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