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Brazilian Archives of Biology and Technology

Print version ISSN 1516-8913

Abstract

CAMPOS, João Batista  and  SOUZA, Maria Conceição de. Arboreous vegetation of an alluvial riparian forest and their soil relations: Porto Rico island, Paraná river, Brazil. Braz. arch. biol. technol. [online]. 2002, vol.45, n.2, pp. 137-149. ISSN 1516-8913.  http://dx.doi.org/10.1590/S1516-89132002000200004.

The dynamics of alluvial deposits in floodplains forms islands and sandbanks. Deposits frequently accumulate at the river margins and on islands with consequent side growths. One of these sandbanks which started to form in 1952 annexed an area of 12.4ha to the Porto Rico island (53º15’W and 22º45’S). At present a forest fragment of approximately 2.0 ha exists in this place. The structural analysis of arboreous vegetation of this fragment showed a floristic gradient related to the physical and chemical variations of the substratum. High density of pioneer species associated to the absence of recruitment of new individuals of these and other successional categories indicated that the forest was impaired in its succession process. This fact could be associated with constant disturbances caused by cattle in the area.

Keywords : Alluvial forest; floodplain; forest structure; phytosociology; riparian vegetation; succession.

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