Distribuição espacial da regeneração natural de Aniba rosaeodora Ducke (pau-rosa).

Abstract

The spatial distribution of the natural regeneration of Aniba rosaeodora Ducke (rosewood), was studied in an area of exploration of the species for essential oil production, at the municipality of President Figueiredo, state of Amazonas, by means of the individuals census, to which the Cartesian coordinates methodology was applied, with the mother tree as point of crossing the axes. The plants were grouped by quadrant, by distance classes starting from the mother tree and by height classes, with the objective of describing its dispersion pattern. Most of the 323 found seedlings, (79,27%) was concentrated on the Southwest (47,07%) and Northwest (32,20%) quadrants. The species presented a barocoryc pattern, and, eventually, zoocoryc, dispersed mainly by birds. The largest seedlings density was observed in the distance class of 4m-5m starting from the mother plant, and decreased with increasing distance between the seedlings and the mother plant, individuals were not found beyond 23m. The largest concentration of plants by height class was found from 11cm to 16cm, with 131 seedlings. The seedlings height varied from 7cm to 55cm and the average was 17,85cm. A significant linear correlation was not observed between seedlings height and mother tree distance. The species did not follow the model proposed by Janzen-Connell, in which the largest probability of seedlings establishment is found with increased distance of the mother plant.