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The Amazon deforestation in the last 30 years resulted in the fragmentation of the region's forests. Fragmentation can alter the diversity and floristic composition of the fragments formed and ecological processes such as nutrient cycling, pollination and the ability to store carbon. In the Amazon, palms are important components of vegetation and many species are key resources for the wildlife. Thus, a decrease in palm density may cause unpredictable changes in the forest structure and the food chain. This study aimed to know and compare the floristic composition and some phytosociological parameters of palm communities in three secondary forest fragments of different ages and a primary fragment in the APA 'Igarapé São Francisco', in Rio Branco, Acre, to evaluate the alterations due to the fragmentation and anthropization. The results indicate that the APA palm flora is poor when compared to that of other surrounding forests. The oldest fragments show a greater richness of genera and species, but the palm communities found are structurally abnormal, with the absence or low number of seedlings. The most abundant species was Attalea phalerata, typical of early regeneration forests, but dominant in the fragment with 35-40 years, suggesting that the landscape modifications in the APA may be favoring this species. In the younger fragment (5-10 years), of the palm community survival is compromised by anthropic changes (forest fires), the fragmentation and invasion of bamboo (Guadua spp.) in the forest understory.

enciclopédia biosfera

COMPARACAO FLORISTICA E FITOSSOCIOLOGICA ENTRE COMUNIDADES DE PALMEIRAS DE FLORESTAS SECUNDARIAS E PRIMARIA DA AREA DE PROTECAO AMBIENTAL ‘IGARAPE SAO FRANCISCO’, ACRE, BRASIL