African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6578

Full Length Research Paper

Modelling crown volume in Acacia mearnsii stands

Carlos Roberto Sanquetta
  • Carlos Roberto Sanquetta
  • Universidade Federal do Parana, Laboratorio de Inventario Florestal (LIF), Centro de Excelencia em Pesquisas sobre Fixacao Carbono na Biomassa (BIOFIX), Av. Pref. Lothario Meissner, 900 - Jardim Botanico - Campus III, CEP: 80210-170 - Curitiba - Parana ? Brasil.
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Alexandre Behling
  • Alexandre Behling
  • Universidade Federal do Parana, Laboratorio de Inventario Florestal (LIF), Centro de Excelencia em Pesquisas sobre Fixacao Carbono na Biomassa (BIOFIX), Av. Pref. Lothario Meissner, 900 - Jardim Botanico - Campus III, CEP: 80210-170 - Curitiba - Parana ? Brasil.
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Ana Paula Dalla Corte
  • Ana Paula Dalla Corte
  • Universidade Federal do Parana, Laboratorio de Inventario Florestal (LIF), Centro de Excelencia em Pesquisas sobre Fixacao Carbono na Biomassa (BIOFIX), Av. Pref. Lothario Meissner, 900 - Jardim Botanico - Campus III, CEP: 80210-170 - Curitiba - Parana ? Brasil.
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Augusto Arlindo Simon
  • Augusto Arlindo Simon
  • TANAC S.A. Departamento Florestal, Rua Torbjorn Weibull, 199 ? Tanac, CEP: 95780-000, Montenegro ? Rio Grande do Sul ? Brasil.
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Aurelio Lourenco Rodrigues
  • Aurelio Lourenco Rodrigues
  • Universidade Federal do Parana, Laboratorio de Inventario Florestal (LIF), Centro de Excelencia em Pesquisas sobre Fixacao Carbono na Biomassa (BIOFIX), Av. Pref. Lothario Meissner, 900 - Jardim Botanico - Campus III, CEP: 80210-170 - Curitiba - Parana ? Brasil.
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Guilherme Camacho Cadori
  • Guilherme Camacho Cadori
  • Universidade Federal do Parana, Laboratorio de Inventario Florestal (LIF), Centro de Excelencia em Pesquisas sobre Fixacao Carbono na Biomassa (BIOFIX), Av. Pref. Lothario Meissner, 900 - Jardim Botanico - Campus III, CEP: 80210-170 - Curitiba - Parana ? Brasil.
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Sergio Costa Junior
  • Sergio Costa Junior
  • Universidade Federal do Parana, Laboratorio de Inventario Florestal (LIF), Centro de Excelencia em Pesquisas sobre Fixacao Carbono na Biomassa (BIOFIX), Av. Pref. Lothario Meissner, 900 - Jardim Botanico - Campus III, CEP: 80210-170 - Curitiba - Parana ? Brasil.
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  •  Received: 31 March 2015
  •  Accepted: 20 May 2015
  •  Published: 09 July 2015

Abstract

The aim of the present study was to model the crown volume in black wattle stands (Acacia mearnsii De Wild.) in Rio Grande do Sul, Brazil. The study was carried out in plots installed in black wattle stands in area where the plantations of the species are common. Two trees in each plot of average diameter were felled to determination total height, crown length (crown height) and crown width taken twice, each measurement oriented perpendicular to the other across the bole axis and parallel to the base of the crown. To calculate crown volume (cv) widths were taken every meter starting at the base of the tree bole. Stepwise, backward, and forward variable selection methods were used to formulate the volume equations. The combined variable squared diameter and crown height (d²ch) was the most highly correlated with crown volume (r=0.84). This in turn was the variable that was integrated into the selected model, both in the stepwise and forward selection methods. The equation cv = b1 d²ch + εi was the model that provided the best fit for predicting crown volume in black wattle stands, both in age rotation and in young stands.

 

Key words: Acacia mearnsii; morphometry; stepwise; models.