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Sediment water exchanges of nutrients and oxygen on tidal flats in the Ems-Dollard estuary
Rutgers van der Loeff, M.M.; van Es, F.B.; Helder, W.; De Vries, R.T.P. (1981). Sediment water exchanges of nutrients and oxygen on tidal flats in the Ems-Dollard estuary. Neth. J. Sea Res. 15(1): 113-129
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • Rutgers van der Loeff, M.M.
  • van Es, F.B.
  • Helder, W.
  • De Vries, R.T.P.

Abstract
    Oxygen and nutrient exchanges have been measured in bell jar experiments in intertidal flats of the Ems-Dollard estuary. At two stations in the outer estuary the exchange of ammonia and silica was correlated with oxygen exchange and light conditions. The Heringsplaat in the Dollard, however, was a sink for nitrate, ammonia and silica throughout the year, in the light and in the dark and even during periods of net oxygen consumption. The difference with the two other stations may be related to the higher nutrient supply and longer emersion period at the Heringplaat. Phosphate exchange was generally low but in June a release of 1 mmol.m-2.d-1 was observed at the Heringplaat. Estuarine mixing plots show that there was a net release of silica in the Dollard during late summer. The origin of this silica was probably dissolution of suspended material in the water phase. During emersion the inorganic nitrogen nutrients can become nearly depleted at the sediment surface and may limit diatom growth.

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