Comparison of taper functions for different ages and thinning regimes in Pinus oocarpa plantations

Detalhes bibliográficos
Autor(a) principal: Machado, Sebastião do Amaral
Data de Publicação: 2004
Outros Autores: Urbano, Edilson, Conceição, Marcio Barbosa da, Figueiredo Filho, Afonso, Figueiredo, Décio José de
Tipo de documento: Artigo
Idioma: por
Título da fonte: Pesquisa Florestal Brasileira (Online)
Texto Completo: https://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1595
Resumo: The present research work aimed to test several taper models and to select the one of the best adjustment. The used data, belonging to Duraflora S. A. Located in the county of Agudos, State of São Paulo, is composed of 1100 trees of Pinus oocarpa distributed in 11 management regimes. The adjusted models were: Polinomial of the 5th degree, Polinomial of 2nd degree, Polynomial of Fractionary power, beside the models of volume ratio from Amateis & Burkhart, and the one from Clutter. The selection of the best model was based on a “ ranking “ with the determination coefficient (R2) and the standard error of estimate in percentage (Syx%) and posterior graphic analysis of the stem profile to detect the model that provided diameter estimates more acurated inside and outside bark. Analyzing the results it was concluded that the best model to express, on the average, the diameter along the stem of the trees of Pinus oocarpa, and best describes the profile of the trees, was that one of Fractionary Power.
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spelling Comparison of taper functions for different ages and thinning regimes in Pinus oocarpa plantationsComparação de modelos de afilamento do tronco para diferentes idades e regimes de desbaste em plantações de Pinus oocarpa Schiede.Perfil do fusteAjuste de modelosRegime de manejoStem profileTaper functionManagement regimesThe present research work aimed to test several taper models and to select the one of the best adjustment. The used data, belonging to Duraflora S. A. Located in the county of Agudos, State of São Paulo, is composed of 1100 trees of Pinus oocarpa distributed in 11 management regimes. The adjusted models were: Polinomial of the 5th degree, Polinomial of 2nd degree, Polynomial of Fractionary power, beside the models of volume ratio from Amateis & Burkhart, and the one from Clutter. The selection of the best model was based on a “ ranking “ with the determination coefficient (R2) and the standard error of estimate in percentage (Syx%) and posterior graphic analysis of the stem profile to detect the model that provided diameter estimates more acurated inside and outside bark. Analyzing the results it was concluded that the best model to express, on the average, the diameter along the stem of the trees of Pinus oocarpa, and best describes the profile of the trees, was that one of Fractionary Power.O presente trabalho objetivou testar vários modelos de afilamento e selecionar o de melhor ajuste. Os dados usados, pertencentes a Duraflora S. A., de Agudos – SP, compõem-se de 1100 árvores de Pinus oocarpa distribuídas em 11 regimes de manejo, com idade variando de 5 a 25 anos e tratamentos de 0 a 6 desbastes. Foram medidos os diâmetros de todas as árvores ao longo do fuste, nas alturas de 0.1 m, 1.3 m, 2.1 m, e daí a cada 2 metros até um diâmetro mínimo de 3 cm, e também a altura total. Com base nestes diâmetros foi calculado o volume de todas as árvores, através da fórmula de Smalian. Em seguida foram ajustados os modelos: Polinomial do 5o grau, Polinomial de 2º grau, Polinômio de Potência Fracionária, além dos modelos de razão de volume de Amateis & Burkhart, e o de Clutter. A seleção do melhor modelo foi baseada num “ranking” com o coeficiente de determinação (R2) e o erro padrão da estimativa em percentagem (Syx%) e posterior análise gráfica de perfil para detectar o modelo que proporcionou estimativas mais acuradas de diâmetro com e sem casca. Analisando-se os resultados concluiu-se que o melhor modelo para expressar, em média, o diâmetro ao longo das seções das árvores de Pinus oocarpa, e que melhor descreve o perfil destas, foi o de Potência Fracionária.Embrapa Florestas2004-06-30info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1595Pesquisa Florestal Brasileira; n. 48 (2004): jan./jun.; 41-64Pesquisa Florestal Brasileira; No. 48 (2004): jan./jun.; 41-641983-26051809-3647reponame:Pesquisa Florestal Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1595/648Machado, Sebastião do AmaralUrbano, EdilsonConceição, Marcio Barbosa daFigueiredo Filho, AfonsoFigueiredo, Décio José deinfo:eu-repo/semantics/openAccess2018-03-22T17:55:25Zoai:pfb.cnpf.embrapa.br/pfb:article/1595Revistahttps://pfb.cnpf.embrapa.br/pfb/index.php/pfb/PUBhttps://pfb.cnpf.embrapa.br/pfb/index.php/pfb/oaipfb@embrapa.br || revista.pfb@gmail.com || patricia.mattos@embrapa.br1983-26051809-3647opendoar:2018-03-22T17:55:25Pesquisa Florestal Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Comparison of taper functions for different ages and thinning regimes in Pinus oocarpa plantations
Comparação de modelos de afilamento do tronco para diferentes idades e regimes de desbaste em plantações de Pinus oocarpa Schiede.
title Comparison of taper functions for different ages and thinning regimes in Pinus oocarpa plantations
spellingShingle Comparison of taper functions for different ages and thinning regimes in Pinus oocarpa plantations
Machado, Sebastião do Amaral
Perfil do fuste
Ajuste de modelos
Regime de manejo
Stem profile
Taper function
Management regimes
title_short Comparison of taper functions for different ages and thinning regimes in Pinus oocarpa plantations
title_full Comparison of taper functions for different ages and thinning regimes in Pinus oocarpa plantations
title_fullStr Comparison of taper functions for different ages and thinning regimes in Pinus oocarpa plantations
title_full_unstemmed Comparison of taper functions for different ages and thinning regimes in Pinus oocarpa plantations
title_sort Comparison of taper functions for different ages and thinning regimes in Pinus oocarpa plantations
author Machado, Sebastião do Amaral
author_facet Machado, Sebastião do Amaral
Urbano, Edilson
Conceição, Marcio Barbosa da
Figueiredo Filho, Afonso
Figueiredo, Décio José de
author_role author
author2 Urbano, Edilson
Conceição, Marcio Barbosa da
Figueiredo Filho, Afonso
Figueiredo, Décio José de
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Machado, Sebastião do Amaral
Urbano, Edilson
Conceição, Marcio Barbosa da
Figueiredo Filho, Afonso
Figueiredo, Décio José de
dc.subject.por.fl_str_mv Perfil do fuste
Ajuste de modelos
Regime de manejo
Stem profile
Taper function
Management regimes
topic Perfil do fuste
Ajuste de modelos
Regime de manejo
Stem profile
Taper function
Management regimes
description The present research work aimed to test several taper models and to select the one of the best adjustment. The used data, belonging to Duraflora S. A. Located in the county of Agudos, State of São Paulo, is composed of 1100 trees of Pinus oocarpa distributed in 11 management regimes. The adjusted models were: Polinomial of the 5th degree, Polinomial of 2nd degree, Polynomial of Fractionary power, beside the models of volume ratio from Amateis & Burkhart, and the one from Clutter. The selection of the best model was based on a “ ranking “ with the determination coefficient (R2) and the standard error of estimate in percentage (Syx%) and posterior graphic analysis of the stem profile to detect the model that provided diameter estimates more acurated inside and outside bark. Analyzing the results it was concluded that the best model to express, on the average, the diameter along the stem of the trees of Pinus oocarpa, and best describes the profile of the trees, was that one of Fractionary Power.
publishDate 2004
dc.date.none.fl_str_mv 2004-06-30
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1595
url https://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1595
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1595/648
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Embrapa Florestas
publisher.none.fl_str_mv Embrapa Florestas
dc.source.none.fl_str_mv Pesquisa Florestal Brasileira; n. 48 (2004): jan./jun.; 41-64
Pesquisa Florestal Brasileira; No. 48 (2004): jan./jun.; 41-64
1983-2605
1809-3647
reponame:Pesquisa Florestal Brasileira (Online)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Pesquisa Florestal Brasileira (Online)
collection Pesquisa Florestal Brasileira (Online)
repository.name.fl_str_mv Pesquisa Florestal Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv pfb@embrapa.br || revista.pfb@gmail.com || patricia.mattos@embrapa.br
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