Soil seed banks in successional stages of forest ecosystems in the Belém, Pará, Brazil, metropolitan region

Fernanda Pantoja Souza, Walmer Bruno Rocha Martins, Richard Pinheiro Rodrigues, Vanda Maria Sales de Andrade, Nayara Nazare Arraes Araujo, Francisco de Assis Oliveira

Resumo


The seed bank is essential for the initiation of natural forest regeneration, especially in ecosystems in
the early stages of development, where there have been anthropogenic or natural disturbances. The objective
of the current study was to evaluate seed bank dynamics in three forest ecosystems, two in Utinga State Park
(PEUt) and one on the Federal Rural University of Amazonia (UFRA) campus, both in Belém, Pará, Amazonian
Brazil. The ecosystems were: primary forest (PF), early successional forest (ESF), and late successional forest
(LSF). For seed bank evaluation, five plots were installed in each forest ecosystem, and in each plot 5 soil
samples were removed at a depth of 0-0.05 m. In the three ecosystems, the most abundant species in the
seed bank were Cecropia obtusa, Phyllanthus tenellus and Vismia guianensis. Zoochoria was the dominant
dispersion syndrome with 1,041 (67.8%) individuals. In the PF and LST ecosystems the predominant life form
was tree, followed by shrub, whereas in the ESF the shrub life form predominated, followed by tree. Thirtyone
species were recorded in PF, 26 in ISF, and 32 in LSF. In general, pioneers were most frequent ecological
group, with 289 individuals (93.2%) in PF, 288 individuals (88.7%) in LSF, and 188 (75.06%) in ESF. Thus, all
ecosystems possessed a high potential for resilience in case of possible forest disturbances, and the PF seed
bank was considered the most diverse in terms of arboreal species.

Palavras-chave


Amazônia Oriental. Germinação de sementes. Resiliência. Unidade de conservação

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DOI: http://dx.doi.org/10.18227/1982-8470ragro.v12i4.4971

Direitos autorais 2018 REVISTA AGRO@MBIENTE ON-LINE

Revista Agroambiente On-line ISSN 1982-8470 (online), www.agroambiente.ufrr.br. E-mail: agroambiente@ufrr.br. Licença Creative Commons
Este obra está licenciado com uma Licença Creative Commons Atribuição-SemDerivações-SemDerivados 3.0 Brasil.