Phenology, litterfall, growth, and root biomass in a tidal floodplain forest in the Amazon estuary

A dinâmica de floresta sujeita a inundacao parece ser fortemente influenciada pela frequencia e intensidade de disturbios naturais como a inundacao. Em uma antiga floresta sucessional de varzea proxima ao porto de Belem, Brasil, testou-se esta hipotese pela medicao sazonal dos padroes de fenologia, incluindo queda de serrapilheira, em relacao a duas variaveis chaves: chuva e nivel da mare. Em adicao, estimamos o crescimento anual da comunidade florestal pela medicao do incremento do diâmetro de troncos ao longo do tempo e desenvolvimento radicular. Encontrou-se alta correlacao entre florescimento e frutificacao com chuva e nivel da mare, porem as correlacoes entre a queda da serrapilheira e estas variaveis foram geralmente fracas. Ao contrario de nossa hipotese, biomassa de raizes ate 1 m de profundidade nao variou significativamente ao longo do gradiente topografico, e esta foi menor a intermediaria em todos os niveis topograficos do que em outras florestas neotropicais. A queda de serrapilheira e o incremento de troncos foram superiores do que em outras florestas tropicais, indicando uma alta produtividade neste ecossistema.

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