Liming and vegetation favor Fe-mobilization in eutrophic wetland soils affected by mine wastes

The aim of this study was to evaluate the effects of liming and vegetation on the dynamic of Fe in eutrophic wetland soils affected by mine wastes, under different flooding regimes. Simulated soil profiles were constructed with two types of wastes (pH ∼ 3.1 and ∼6.4) collected from polluted salt marshes and four treatments were assayed: without liming + without plant, without liming + with plant, with liming + without plant, and with liming + with plant. The plant species was the halophyte Sarcocornia fruticosa. Three horizons were differentiated in the profiles: A horizons (never underwater), C1 (alternat ing flooding–drying conditions), and C2 (always underwater). The pH, Eh, salinity, and the concentrations of DOC and soluble Fe were measured regularly at each horizon for 18 weeks. Liming decreased Fe sol ubility, mainly in the acidic waste (maximum average concentrations ∼18 mg L−1 without liming and ∼6 mg L−1 with liming). However, liming also facilitated a drop in Eh, increasing soluble Fe content. Plant rhizosphere re-distributed this Fe, which was accumulated in the upper horizons of the treat ments with liming + with plant, particularly in the acidic waste (average concentrations ∼10 mg L−1 in the A horizon and ∼5 mg L−1 in the C1 and C2 horizons). Therefore, we conclude that the combined use of liming and vegetation enhance the mobilization of Fe in eutrophic wetland soils polluted by mine wastes under alternating flooding–drying conditions. This should be considered for the envi ronmental management of these sites due to the role of Fe-minerals as sink for potentially-harmful compounds

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González Alcaraz M.N. y Álvarez Rogel J. Liming and vegetation favor Fe-mobilization in eutrophic wetland soils affected by mine wastes. Elsevier B.V., 2012. https://doi.org/10.1016/j.ecoleng.2012.12.042

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Fecha de creación 05-11-2024
Fecha de última modificación 05-11-2024
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Identificador de los metadatos 7253af4f-6864-542f-aa37-74076905bbf5
Idioma de los metadatos Español
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Categoría del conjunto de alto valor (HVD) Observación de la Tierra y medio ambiente
Categoría temática ISO 19115 biota
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Nombre del autor González Alcaraz, M.N. y Álvarez Rogel, J.
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Identificador alternativo DOI: 10.1016/j.ecoleng.2012.12.042
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Email del autor nazaret.gonzalez@upct.es
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