IADO   05364
INSTITUTO ARGENTINO DE OCEANOGRAFIA
Unidad Ejecutora - UE
artículos
Título:
Flooding effects on phosphorus dynamics in an Amazonian mangrove, northern Brazil
Autor/es:
MENDOZA, U.; CORDEIRO, C.; MENEZES, M.; LARA, R.J.
Revista:
PLANT AND SOIL
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2012 vol. 353 p. 107 - 121
ISSN:
0032-079X
Resumen:
AbstractAims and methods We examined porewater salinity,soil redox potential (Eh), soil extractable phosphate(extr.-P), leaf phosphorus (leaf-P) and plant growth inrelation to inundation frequency (IF) and mangrovespecies distributions along a 600 m transect in theBragança Peninsula, North Brazil.Results The forest species composition changedacross the tidal zone with Avicennia germinansdominating (99.1%) the high intertidal (HI) zonewhere the IF was 41?67 d.y−1, Rhizophora mangle,Laguncularia racemosa and A. germinans co-occuredin the mid intertidal (MI), and a mixed R. mangle(47.1%) - A, germinans (41.2%) stand occupied thelow intertidal (LI) zone with an IF of 124?162 d.y−1.Low IF resulted in high Eh levels (200 mV) in the HIzone relative to the LI where Eh ranged from 0?100 mV.The IF showed a significant positive correlation withextr.-P (r=0,89; p=0.05) and a negative associationwith Eh (r=−0,75; p=0.05).Conclusion An ANCOVA confirmed that Eh andextr.P were influenced by flooding. Variations inthese factors were reflected in patterns of P leaf tissueconcentrations across the gradient; however, aMANCOVA showed that leaf-P was not relatedto tree height, tree volume or basal area. Waterloggingconditions, porewater salinity, and Pdynamics in the sediment appear to influence theforest structure. We suggest that P availabilityplays an important role in controling mangrovespecies distributions but not their growth.