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Sulfide-induced release of phosphate from sediments of coastal lagoons and the possible relation to the disappearance of Ruppia sp. Heijs, S.K.; Azzoni, R.; Girodani, G.; Jonkers, H.M.; Nizzoli, D.; Viaroli, P.; van Gemerden, H. (2000). Sulfide-induced release of phosphate from sediments of coastal lagoons and the possible relation to the disappearance of Ruppia sp. Aquat. Microb. Ecol. 23(1): 85-95. https://dx.doi.org/10.3354/ame023085 In: Aquatic Microbial Ecology. Inter-Research: Oldendorf/Luhe. ISSN 0948-3055; e-ISSN 1616-1564

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Beschikbaar in	Auteurs
VLIZ: Open access 339217 [ download pdf ]

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Trefwoorden

Anoxic conditions Chemical compounds > Phosphorus compounds > Phosphates Chemical compounds > Sulphur compounds > Sulphides Chemical elements > Metals > Transition elements > Heavy metals > Iron Chemical elements > Nonmetals > Atmospheric gases > Oxygen Chemical elements > Nonmetals > Atmospheric gases > Oxygen > Dissolved gases > Dissolved oxygen Chemical reactions > Reduction > Sulphate reduction Flora > Weeds > Marine organisms > Seaweeds > Sea grass MED, Italy, Veneto MED, Italy, Veneto, Po Delta, Valli di Comacchio Microorganisms > Bacteria > Anaerobic bacteria Pollution effects Sediments Sediments > Anoxic sediments Water Water bodies > Lagoons Water bodies > Lagoons > Coastal lagoons Ruppia L. [WoRMS] Valli di Comacchio [Marine Regions]; Veneto [Marine Regions] Marien/Kust

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Auteurs		Top
Heijs, S.K. Azzoni, R. Girodani, G. Jonkers, H.M.	Nizzoli, D. Viaroli, P. van Gemerden, H., correspondent

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Abstract

The production and consumption of sulfide and its influence on phosphorous cycling were studied in a hypertrophic coastal lagoon (Valle Smarlacca, Italy). Oxygen measurements revealed that the water phase was supersaturated except for the layer directly overlying the sediment. This layer was devoid of oxygen and contained sulfide at all times. Maximal rates of sulfide production, calculated from in situ profiles, were observed in the 0 to 2 cm sediment layer and the 1 cm water layer directly above. Sediment iron data suggested a moderate chemical buffering capacity towards free sulfide; however, the in situ buffering capacity was fully exploited. Stirring increased the chemical buffer, indicating that, in situ, part of the iron did not contribute to the chemical buffer. The potential rate of biological sulfide oxidation, estimated in sediment slurries amended with oxygen, was high; however, the actual rate was low due to a shortage of oxygen in the sediments and the overlying water. Evidence was obtained for enhanced release of phosphate caused by free sulfide. Under simulated natural conditions the release of phosphate exceeded the initial concentration of Fe-bound phosphate by an order of magnitude, indicating a significant contribution of non-iron-bound phosphate. The observations in Valle Smarlacca were used to shed light on the virtually complete disappearance of Ruppia sp. from other lagoons of the Valli di Comacchio (Northern Italy).

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