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| Araújo, Emanuel José Gomes de; Pelissari, Allan Libanio; David, Hassan Camil; Scolforo, José Roberto Soares; Netto, Sylvio Péllico; Morais, Vinícius Augusto. |
| The objective of this work was to adjust traditional models of hypsometric relations for homogeneous candeia stands, under different initial spacings. Ten models were adjusted for hypsometric relations. The assessment criteria obeyed the highest determination coefficient and the lowest standard error of estimate in percentage. The F test was also evaluated, as well as the significance of the regression coefficients, the graphical analysis of the residues and the identity test when the same model was selected for different treatments. It was observed that, over time, the hypsometric curves reduce their tilt, move to the right and elevate, reducing the interval among them from the sixth year. The traditional hypsometric relation models as Henricksen,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hypsometric models Height/diameter relation Identity of models Recursos Florestais; Engenharia Florestal Modelos hipsométricos Relação altura/diâmetro Identidade de modelos. |
| Ano: 2012 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/397 |
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| Araújo, Emanuel José Gomes de; Pelissari, Allan Libanio; David, Hassan Camil; Miranda, Rodrigo Otávio Veiga de; Péllico Netto, Sylvio; Morais, Vinícius Augusto; Scolforo, José Roberto Soares. |
| O objetivo do presente trabalho foi ajustar modelos de distribuição diamétrica, relação hipsométrica, afilamento e volume, a fim de caracterizar as relações dendrométricas para Pinus sp. em fragmentos remanescentes de povoamentos da década de 1970 na região da Reserva de Desenvolvimento Sustentável Veredas do Acari, norte do estado de Minas Gerais. Foi realizada a identificação dos fragmentos de Pinus sp. e efetuado o seu mapeamento. Foram coletados dados biométricos das árvores para as modelagens da distribuição diamétrica, relação hipsométrica, afilamento e volume individual. O critério de seleção dos modelos consistiu na avaliação do coeficiente de determinação ajustado, erro padrão da estimativa em porcentagem, teste F, significância dos coeficientes... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Recursos Florestais; Engenharia Florestal; Mensuração Florestal Distribuição diamétrica; Modelos hipsométricos; Funções de afilamento; Modelos volumétricos Diameter distribution; Hypsometric models; Taper; Volumetric models. |
| Ano: 2012 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/425 |
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| David, Hassan Camil; Marinheski Filho, Ataides; Pelissari, Allan; Péllico Netto, Sylvio; Araújo, Emanuel; Baum, Luiza. |
| This paper aimed to evaluate the accuracy of taper functions fitted with and without stratification on Pinus sp. trees. Three strata were allocated using diameter at 1.3 m above the ground, artificial form factor and Schiffel’s form quotient as stratification criteria. Schöepfer, Kozak et al. Hradetzky, Garcia et al., Ormerod and Demaerchalk taper functions were tested and the one which best fitted to the total population was selected by statistics standard error of estimate in percentage (syx%), adjusted coefficient of determination (R²aj.) and residual scatterplots. After this, the selected function was fitted with data stratified and the gain of accuracy was evaluated by two statistical methods. As results, Hradetzky’s function adjusted better when... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Form of boles; Accuracy of functions; Estimate standard error Forma de fustes; Acurácia de funções; Erro padrão da estimativa. |
| Ano: 2014 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/659 |
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