Author： Mäkelä Kalervo Tuominen Liisa
Publisher： Springer Publishing Company
ISSN： 0018-8158
Source： Hydrobiologia, Vol.492, Iss.1-3, 2003-02, pp. : 43-53
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Abstract
Chemical profiles of nutrients at the sediment–water interface were measured in the northern Baltic Sea. A whole core squeezer technique capable of mm-scale resolution was used to obtain the vertical profiles of NO3−, NO2−, o-P, NH4+ and Si in the soft bottom sediments. The profiles were compared with nutrient flux and denitrification measurements. In the Gulf of Finland, the profiles revealed a marked chemical zonation in NO3− and NO2− distribution indicating strong potential of nitrification just under the sediment surface followed by a layer of denitrification down to a depth of 30 mm. Below the depth of 20 mm NO3− was usually absent, whereas other nutrients were increasing steadily in concentration. A distinct minimum of NO3− was observed at the sediment–water interface, suggesting NO3− uptake by a microbial biofilm and/or active denitrification at the suboxic microniches usually present in organic-rich sediments. At the deep stations in the Baltic Proper, the NO3− concentration in pore water, as well as denitrification, were very low. The concentrations of NH4+, o-P and Si were usually increasing steadily with depth.
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