Different models for Eucalyptus sp. trunk taper for the brazilian forestry scenario

• Autor(a) principal: Bernardi, Lucas Kröhling
• Data de Publicação: 2021
• Outros Autores: Thiersh, Monica Fabiana Bento Moreira, Arteaga, Argemiro José Moreno, Almeida, Alessandro Araujo Amaral de, Pádua, Franciane Andrade de, Thiersch, Cláudio Roberto
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Ciência Florestal (Online)
• Texto Completo: https://periodicos.ufsm.br/cienciaflorestal/article/view/40376
• topic: Multiproducts; Modeling techniques; Assortment; Stem shape; Multiprodutos; Técnicas de modelagem; Sortimento; Forma do tronco

Taper functions are useful tools for estimating log diameters and commercial wood volumes at any height, being of great importance to forestry enterprises that aim to optimize the use of their forests. Thus, the aim of this work was to evaluate segmented, non-segmented and variable-exponent taper models for studying the trunk taper of Eucalyptus sp. With a database from a 6.3-year-old Eucalyptus sp. planted forest, in the south of the state of São Paulo, the taper models tested were: the non-segmented models of Schöepfer (1966) and Ormerod (1973) the segmented model of Max and Burkhart (1976), and the variable-exponent models of Muhairwe (1999), Methol (2001) apud Rachid et al. (2014) and Kozak (2004). Real volumes were calculated using the Smalian formula. The equation proposed by Kozak (2004) obtained the best accuracy to estimate the diameters, whereas the Muhairwe (1999) equation showed the best graphic dispersion results for the same estimate. For volume estimation, the equation that obtained the best results was that proposed by Methol (2001) apud Rachid et al. (2014), with the best measures of precision and better graphical behavior, with smaller trends and more concentrated dispersion of the residues.