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| Curto, Rafaella De Angeli; de Mattos, Patrícia Povoa; Braz, Evaldo Muñoz; Zachow, Randolf; Péllico Netto, Sylvio. |
| The objective of this study was to characterize of an unmanaged stand of Araucaria angustifolia and to development of models to quantify the wood potential, aiming to support the development of forest management plans in stands with similar conditions. The work was developed into a stand established in 1946, in National Forest of Açungui, in Campo Largo County, Paraná State, Brazil. There was only one thinning in the stand, between 1970 and 1980. From the frequency of individuals in each diametric class, it was observed the condition of stagnation and competition with cohort in the beginning of class distribution. With the application of the probability density function of Weibull-3P, Trorey model, and the 5th polynomial by diameter class, it was possible... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Forest Management; National Forest; Diameter distribution Engenharia Florestal; Manejo florestal Manejo florestal; Floresta Nacional; Distribuição diamétrica. |
| Ano: 2014 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/764 |
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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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