Floresta e Ambiente
Floresta e Ambiente
Original Article Forest Management

Efeito da Competição nas Relações Dimensionais de Araucária

Effect of Competition in Dimensional Relations of Araucaria

Emanuel Arnoni Costa; César Augusto Guimarães Finger


Este estudo teve por objetivo descrever o efeito da competição nas relações dimensionais de Araucaria angustifolia (Bertol.) Kuntze. Análise de covariância foi usada para comparar as tendências das relações dimensionais para grupo de árvores crescendo livre em áreas de campo e sob competição na floresta. Árvores crescendo sob competição, quando comparadas às crescendo livre, apresentaram, em média, linhas de regressão com maior intercepto para a altura, altura de inserção de copa, relação altura/diâmetro, avaliando-se um mesmo diâmetro à altura do peito. A diminuição da competição de árvores aumenta o comprimento de copa e reduz a altura do ponto de inserção de copa. A inclusão da variável índice de competição nos modelos melhorou ajuste e precisão das relações dimensionais em árvores de floresta, o que possibilita usar as equações ajustadas na estimativa das dimensões de copa como auxílio às atividades silviculturais de araucária.


modelagem, concorrência, relações morfométricas


This study aimed to describe the effect of competition in the dimensional relations of Araucaria angustifolia (Bertol.) Kuntze. Covariance analysis was used to compare tendency dimensional relationship for the group of open grown in fields and under competition in the forest. Trees growing under competition when compared to those with open grown presented, on average, regression lines with superior intercept for height, height of crown insertion point, height/diameter ratio, when evaluating the same diameter at breast height. Decreased tree competition increases the crown length and reduces height of crown insertion point. The inclusion of variable competition index in models improved fit and accuracy of dimensional relations in forest trees, which allows to use the equations fitted to estimate the crown dimensions as assistance for silvicultural activities of araucaria.


modeling, concurrence, morphometric relations


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