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| Machado, Sebastião do Amaral; Mendes Nascimento, Rodrigo Geroni; Augustynczik, Alan Lessa Derci; Silva, Luís César Rodrigues da Silva; Figura, Marco Aurélio; Pereira, Eder Miguel; Téo, Saulo Jorge. |
| Esta pesquisa teve como objetivos testar e selecionar os melhores modelos matemáticos para estimara altura total (ht) e a altura de fuste (hf), em função do diâmetro à altura do peito (DAP), bem como estabelecer arelação dendrométrica entre ht/hf. Os dados provieram da medição de diâmetros, altura total e altura de fuste detodas as araucárias existentes no fragmento de Floresta Ombrófila Mista, de 15,2 hectares, situado no CampusJardim Botânico da Universidade Federal do Paraná (UFPR), Curitiba, PR. Foram testados 13 modelos, incluindomodelos aritméticos, logarítmicos e não-lineares adaptados, como os de Chapman & Richards e de Mitscherlichou Monomolecular. Os modelos não-lineares foram ajustados pelo algoritmo de Levenberg-Marquardt. Utilizaramse,como... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Curva altura/diâmetro; Relação dendrométrica; Modelos hipsométricos. Height/DBH curve dendrometric relationship hypsometric models.. |
| Ano: 2010 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/58 |
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| Machado, Sebastião do Amaral; Figura, Marco Aurélio; Silva, Luís César Rodrigues da; Téo, Saulo Jorge; Stolle, Lorena; Urbano, Edílson. |
| The objectives of this research were: to develop equations to estimate the stem and firewood volume of bracatinga (Mimosa scabrella Benth.); to evaluate the accuracy of the estimates having as a comparator the true volumes obtained by the xylometer method; to test the validity of Ahrens' (1981) published equation. In bracatinga stands, 384 trees were measured until a minimum diameter of 4 cm at the small end. The validation set was composed by 55 trees measured by the xylometer. The ² (chi-square), aggregated difference test, standard error of estimation, average error and graphical distribution of the residuals were used on validation process. The best equation obtained for the stem was provided by Schumacher-Hall model. For firewood, data were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Volume equations validation xylometer. Equações de volume; Validação; Xilômetro.. |
| Ano: 2010 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/59 |
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| Machado, Sebastião do Amaral; Urbano, Edilson; Jarschel, Barbara; Teo, Saulo Jorge; Figura, Marco Aurélio; Silva, Luis César Rodrigues da. |
| This research aimed to determine dry weights and carbon contents by age, and by compartment of Mimosa scabrella trees, their correlations with other measured tree variables. The data for this research work came from 190 trees located in several counties of the Curitiba metropolitan region. Total height, crow height, stem height, DBH and crow diameter were measured of each one of the 190 trees. Every sample tree was felled down and sectioned in the following components: stem, thick branches (diameter ≥ 4 cm), thin branches (diameter < 4 cm), foliage, and dead branches. The green weigth of each tree component was weighted in the field. Small sub samples of each tree component were also weighted in the field and brought to the laboratory for oven dry. Thus... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Green weight; Dry weight; Carbon content; Mimosa scabrella Peso verde; Peso seco; Teor de carbono; Bracatingais. |
| Ano: 2011 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/213 |
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