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Relationships between vegetation and environmental characteristics in a salt-marsh system on the coast of Northwest Spain

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Abstract

This study reports an investigation of relationships between environmental variables (electrical conductivity of groundwater, soil redox potential, water-table depth, and high-tide flooding depth) on vegetation zonation in a salt-marsh system on the coast of northwest Spain. Discriminant analysis indicated that conductivity (a measure of salinity) and redox potential are correlated with vegetation type within the study area. Conductivity declines with increasing altitude and distance from the sea, whereas redox potential does not vary along well-defined large-scale gradients. Soils with the most strongly oxidizing conditions (i.e. moderate salinity, with Eh greater than 200 mV and thus subtoxic levels of Mn2+, Fe2+ and S2-) are occupied by the Halimione portulacoides community. Communities dominated by Juncus maritimus, and Phragmites australis reedbeds, occur at more strongly reducing sites (Eh between 100 and 200 mV, with possibly toxic levels of Mn2+ but not of Fe2+); the presence of these communities may thus be limited by Fe2+ toxicity. The most strongly reducing sites (with Eh low enough for the reduction of Fe3+ to Fe2+) are occupied by Spartina maritima and Scirpus maritimus communities. These communities appear to be tolerant of Fe2+, and even of low concentrations of S2-.

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Authors and Affiliations

  1. Departamento de Biología Vegetal, Laboratorio de Botánica, Facultad de Farmacia, Universidade de Santiago, E-15706, Santiago de Compostela, Spain

    J. M. Sánchez & J. Izco

  2. Departamento de Edafología y Química Agrícola, Facultad de Biología, Universidade de Santiago de Compostela, E-15706, Santiago de Compostela, Spain

    X. L. Otero

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Sánchez, J.M., Otero, X.L. & Izco, J. Relationships between vegetation and environmental characteristics in a salt-marsh system on the coast of Northwest Spain. Plant Ecology 136, 1–8 (1998). https://doi.org/10.1023/A:1009712629733

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