The biogeochemistry and trace metals distribution of mangrove rhizospheres

Soils and porewater of the rhizosphere of mangrove trees, Rhizophora mangle L. and Avicennia schaueriana Stapf & Leech., of the salt marsh grass Spartina alterniflora Loisel, and of unvegetated mud flats, were analyzed for pH, salinity, platinum electrode redox potential, organic matter content,...

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Bibliographic Details
Published in:Biotropica 1993-09, Vol.25 (3), p.252-257
Main Authors: Lacerda, L.D, Carvalho, C.E.V, Tanizaki, K.F, Ovalle, A.R.C, Rezende, C.E
Format: Article
Language:English
Subjects:
Acid soils
Agronomy. Soil science and plant productions
Animal and plant ecology
Animal, plant and microbial ecology
AVICENNIA
AVICENNIA SCHAUERIANA
BIOLOGIA DEL SUELO
Biological and medical sciences
BIOLOGIE DU SOL
Brackish
Brackish water ecosystems
BRASIL
BRAZIL
BRESIL
CHIMIE DU SOL
FLUVISOL
FLUVISOLES
FLUVISOLS
Forest soils
Fundamental and applied biological sciences. Psychology
GEOCHEMISTRY
GEOCHIMIE
GEOQUIMICA
GRAMINEAE
MANGROVE SOILS
Marine
Mud flats
OLIGOELEMENT
OLIGOELEMENTOS
Organic soils
QUIMICA DEL SUELO
RHIZOPHORA
RHIZOPHORA MANGLE
RHIZOSPHERE
RIZOSFERA
Sedimentary soils
SEPETIBA BAY, SOUTHEAST BRAZIL
Soil biochemistry
SOIL BIOLOGY
SOIL CHEMISTRY
Soil organic matter
Soil pollution
SPARTINA ALTERNIFLORA
Sulfides
Synecology
TRACE ELEMENTS
TROPICAL ZONES
ZONA TROPICAL
ZONE TROPICALE
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Summary:Soils and porewater of the rhizosphere of mangrove trees, Rhizophora mangle L. and Avicennia schaueriana Stapf & Leech., of the salt marsh grass Spartina alterniflora Loisel, and of unvegetated mud flats, were analyzed for pH, salinity, platinum electrode redox potential, organic matter content, sulfide concentrations, and the total and exchangeable concentrations of trace metals (Fe, Zn, Cu, Pb and Cd). The study was conducted in a fringe mangrove forest in Sepetiba Bay, Rio de Janeiro, Brazil. The rhizospheres differed in their biogeochemistry Mud flats and Rhizophora soils were very reducing, with highest concentrations of sulfide. Avicennia soils showed the highest variability of the variables measured, with the rhizosphere changing from oxic to anoxic conditions. Spartina soils, on the other hand, were generally oxic, with very low sulfide concentration. The distribution of trace metals in these soils varied with the major physical and chemical characteristics. Mud flat soils presented the highest total trace metal concentrations followed by mangrove soils and Spartina soils. However, exchangeable trace metals were similar among the different soils with the exception of Avicennia soils, which due to their characteristic instability of redox conditions, presented much higher exchangeable trace metals concentrations.
ISSN:0006-3606
1744-7429
DOI:10.2307/2388783