Autoecologia de Bauhinia holophylla Steud. (Leguminosae-Caesalpiniolideae), na Reserva Biologica e Estação Experimental de Moji Guaçu, SP

AUTOR(ES)

Josimara Nolasco Rondon

DATA DE PUBLICAÇÃO

2006

RESUMO

A population of Bauhinia holophylla located at a cerrado area in the Reserva Biológica e Estação Experimental de Moji Guaçu was studied in relation to reproductive phenology, leaf life span, seed predation, seed germination and aspects of plant regeneration. The distribution pattern of the juvenile and adult population is considered agregated. This population can be considered on the juvenile stage, due to, the greater number of plants concentrate in to the first size classes (height and diameter). The mean leaf life span was 8.2 months in the first year and 7.6 months in the second year. The primary productivity of leaves was more intense, during dry season (July-August). Leaf mortality with the period of the minor precipitation registered (dry season). Flower and bud production was associated to the wet season. Leaf fall ocurred during dry season. The new leaves could garantee the production of photoassimilates that would be utilized by all plant organs in their metabolic activities and as a reserve carbohydrate stored in the xylopodium as starch. Higher stems and stem diameter and leaf number in plants were observed in the photoper iodic treatments of 16h and 20 hours (long days) than in plants maintened in 8h and 12 hours (short days). Seeds predation is the principal cause of inexistence of seedlings in that the cerrado area. However, plant regeneration is provided by xylopodium. The seed is neutral to light for germination at the temperature range of 20ºC to 35ºC. Germination speed germination at 25ºC in the dark was higher than under light. The ephemeral permanence of the seeds of B. holophylla in the cerrado soil seed bank, is probably due to neutrality of light and their fast germination at 25ºC-30ºC. Thus, management polices at the Reserva Biológica e Estação Experimental de Moji Guaçu to decrease larvae and predator insects are fundamental to enlarge the production of healthy seeds of B. holophylla. Investigation on auto-ecology, litter and reproductive phenology, may give important information about of species occurring in the Cerrado. Investigations can support recuperation programmes of remnant cerrado areas and constitute model to study populations of plants species the Cerrado.

ASSUNTO(S)

plant phenology plant photoperiodism fotoperiodismo vegetal bauhinia fenologia vegetal

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