Fenodinamcia de lianas e forofitos em um fragmento de cerrado em Itirapina (SP) / Liana and tree phenodynamic in a cerrado fragment from Itirapina (SP), Brazil

AUTOR(ES)

Julia Caram Sfair

DATA DE PUBLICAÇÃO

2006

RESUMO

Different life-forms with different resources allocation strategies can show different phenologies. Biotic and abiotic interactions and anthropogenic disturbance may additionally influence the phenology. The aims of this study were (a) to test the phenology between trees with and without lianas at the edge and in the interior of a dense cerrado fragment in Itirapina, São Paulo state; and (b) investigate the reproductive and vegetative phenophases overlap between lianas and their support trees. Phenological data were taken weekly, during a year, activity and intensity of trees with and without lianas at the edge and in the interior of the fragment were collected. Anadenanthera falcata, Dalbergia miscolobium, Miconia rubiginosa, Qualea grandiflora, Vochysia tucanorum and Xylopia aromatica were the analyzed species. The data were analyzed with circular statistics. A. falcata, D. miscolobium and X. aromatica with lianas invested more on leaf production e less on reproduction than the same species without lianas. M. rubiginosa, V. tucanorum, Q. grandiflora and X. Aromatica at the edge allocated more resources for reproduction and less to leaf change than these species in the interior, since at the edge more light is available. M. rubiginosa in stressful environment (lianas in the interior of the fragment) invested on reproduction as a way to escape from stress. Leaf flushing and fall of A. falcata, M. rubiginosa and V. tucanorum e their associated lianas occurred on dry-wet seasons transitions, indicating that the water is available by deep root system for both life-forms. Pollinators competition promotes different flowering patterns among A. falcata and V. tucanorum and their associated lianas. M. rubinosa and X. aromatica produced fleshy diaspores in the end of dry season, providing resources for animals and increasing diaspore dispersal efficiency

ASSUNTO(S)

liana fenologia vegetal cerrados - fragmentação cerrado fragmentation cerrados plant phenology

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