Vegetative and reproductive phenology of Acacia mearnsii De Wild. in Curitiba, Paraná

摘要

The phenology studies are fundamental to obtain information relating to plants growth and the production of fruits and seeds, making it important for forest species of commercial value, for example: for black wattle. The focus of the study was to evaluate the phenological behavior of Acacia mearnsii planted in the region of Curitiba, over 21 months, and relate the observed phenological patterns with temperature, precipitation and photoperiod. Phenological observations were conducted using the index intensity and the counting method. The phenophases were correlated with climatic variables of maximum, medium and minimum temperature, precipitation and photoperiodic using the Spearman correlation. Reproductive phenophases were observed from June to December, with peak flowering in September, and increased pod and seed in December. No significant correlation were observed in the vegetative phenophases since it was evident the constant presence of sheets at different stages throughout the study. There was no significant correlation between precipitation and phenophases. By contrast, temperature and photoperiod were negatively correlated with flowering (anthesis button).