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d15N dynamics of ammonium and particulate nitrogen in a temperate eutrophic estuary
De Brabandere, L.; Brion, N.; Elskens, M.; Baeyens, W.; Dehairs, F. (2007). d15N dynamics of ammonium and particulate nitrogen in a temperate eutrophic estuary. Biogeochemistry 82(1): 1-14. hdl.handle.net/10.1007/s10533-006-9047-1
In: Biogeochemistry. Springer: Dordrecht; Lancaster; Boston. ISSN 0168-2563; e-ISSN 1573-515X, meer
Peer reviewed article  

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Trefwoorden
    Marien; Brak water
Author keywords
    Ammonium, Fractionation, Scheldt estuary, Stable isotopes

Auteurs  Top 

Abstract
    We monitored the stable nitrogen isotopic composition (d15N) of suspended matter and ammonium in the freshwater stretch of the Scheldt estuary (Belgium) over a full year to investigate for seasonal evolution and possible co-variation between isotopic signatures. The d15N value of ammonium remained rather constant during winter (average = +11.4‰) but increased significantly with the spring and summer bloom, reaching values as high as +70‰. This enrichment of the ammonium pool in 15N coincided with significant ammonium depletion during summer period, suggesting a close causal relationship. Based on a semi-closed system approach we deduced an apparent fractionation factor associated with NH4+ utilization (i.e. combining effects of uptake and nitrification) of 18.4‰ (SE = 2.0‰), which is similar to values reported in literature. Observed variations of ammonium d15N could account for about 69% of d15N variation in suspended matter.

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