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The cycle of dissolved inorganic nitrogen compounds in the Dutch Wadden Sea
Helder, W. (1974). The cycle of dissolved inorganic nitrogen compounds in the Dutch Wadden Sea. Neth. J. Sea Res. 8(2-3): 154-173
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579, more
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  • Helder, W.

    Compared to 1960-1962 concentration of nitrate in the western Wadden Sea was low during 1971-1972; the concentration is, however, mainly determined by the amount of water sluiced in from the Ijsselmeer. Ammonia- and nitrite concentrations were high compared to 1960-1962, mainly as a result of a greater mineralization in the area. The increase of mineralization probably is a consequence of the increase of organic matter from the adjacent North Sea accumulated in the Wadden Sea. In the shallow eastern part of the Dutch Wadden Sea ammonia concentrations are more dominating compared to the western part, as a result of the greater mineralization and formation of ammonia on one hand and the lack of a considerable freshwater input with high nitrate concentration on the other hand. In June 1971 and June 1972 the concentration of dissolved inorganic N (NH4++ NH3+NO2-+ NO3-)fell at some stations below 1 ugat/l; growth-inhibition of the primary producers then is probable.

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