Competition radius between trees in an Atlantic Forest fragment under forest recovery
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Abstract
This research aimed to evaluate distance-dependent competition indices and define a radius of competitive influence between trees in an Atlantic Forest fragment under forest recovery. The study area has 2.53ha, in which the inventory was carried out with a sampling intensity of 15.81%. Three competition indices and twenty distances for the competition radius (1, 2, 3... and 20 m) were evaluated. IC3 index, which relates the DBH of competing trees with that of the objective tree multiplied by the distance between them added to one unit, proved to be the most adequate to represent competition. This index was more strongly correlated with biometric attributes, presented a biological foundation and the lowest variability with the increase of the competition radius. Competition indices and their respective variability tended to stabilize from the competition radius of approximately 6 m. It is concluded that IC3 index and 6m competition radius are indicated for analyzes on the relationship between competitiveness and biometric aspects at the study site.
Keywords: Competitiveness, sigmoidal behavior, distance-dependent competition indices, functional relationship.
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