Abstract
The role of seed bank, seed rain, and regeneration from seedlings and sprouts after swidden agriculture was compared in 5-, 10- and 20-year-old secondary forest and in a primary forest in Bragantina, Pará, Brazil. The seed bank (0–5 cm soil depth) was largest in the 5-year-old forest (1190 ± 284 seeds m−2) and decreased nearly ten-fold with age to 137 ± 19 seeds m−2 in the primary forest. The highest seed rain was in the 5-year-old forest (883 ± 230 seeds m−2 year−1) and the least in the primary forest (220 ± 80 seeds m−2 year−1). Large plants (≥5 cm dbh) had more individuals and species that regenerated from sprouts than from seeds and the most abundant tree species in the secondary forest stands of all ages appear to be maintained by sprouting. The smaller individuals (≥1 m tall, <5 cm dbh) in the 5-year-old forest were mainly from sprouts, but those in the older secondary forests originated mainly from seeds. These results show that at the beginning of succession, although many species can be introduced to swidden fallow from seed bank and seed rain, it is the sprout that is the main source of recruits of primary forest species in secondary forests in Bragantina.



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Acknowledgements
We thank Nelson Rosa for species identification, Nancy Galvão and Mario Rosa for assistance in the field; Dr. Danilo Mendonça and the small farmers of Anani for permission to carry out the study on their land. The Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq-Brazil), provided the research grant. I am very grateful to Dr. Laszlo Nagy for the detailed revision of this article.
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Vieira, I.C.G., Proctor, J. Mechanisms of plant regeneration during succession after shifting cultivation in eastern Amazonia. Plant Ecol 192, 303–315 (2007). https://doi.org/10.1007/s11258-007-9327-4
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DOI: https://doi.org/10.1007/s11258-007-9327-4


