Mendoza, Ursula N., da Cruz, Cleise Cordeiro, Menezes, Moirah P. and Lara, Ruben J. (2012) Flooding effects on phosphorus dynamics in an Amazonian mangrove forest, Northern Brazil. Plant and Soil, 353 (1-2). pp. 107-121. DOI

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Aims and methods
We examined porewater salinity, soil redox potential (Eh), soil extractable phosphate (extr.-P), leaf phosphorus (leaf-P) and plant growth in relation to inundation frequency (IF) and mangrove species distributions along a 600 m transect in the Bragança Peninsula, North Brazil.

The forest species composition changed across the tidal zone with Avicennia germinans dominating (99.1%) the high intertidal (HI) zone where the IF was 41–67 d.y−1, Rhizophora mangle, Laguncularia racemosa and A. germinans co-occured in the mid intertidal (MI), and a mixed R. mangle (47.1%) - A, germinans (41.2%) stand occupied the low intertidal (LI) zone with an IF of 124–162 d.y−1. Low IF resulted in high Eh levels (200 mV) in the HI zone relative to the LI where Eh ranged from 0–100 mV. The IF showed a significant positive correlation with extr.-P (r = 0,89; p = 0.05) and a negative association with Eh (r = −0,75; p = 0.05).

An ANCOVA confirmed that Eh and extr.P were influenced by flooding. Variations in these factors were reflected in patterns of P leaf tissue concentrations across the gradient; however, a MANCOVA showed that leaf-P was not related to tree height, tree volume or basal area. Water-logging conditions, porewater salinity, and P dynamics in the sediment appear to influence the forest structure. We suggest that P availability plays an important role in controling mangrove species distributions but not their growth.

Document Type: Article
Programme Area: UNSPECIFIED
Research affiliation: Ecology > Mangrove Ecology
Refereed: Yes
Open Access Journal?: No
ISSN: 0032-079X
Date Deposited: 29 Aug 2019 13:36
Last Modified: 01 Oct 2020 12:59

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