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Sediment-water nutrient exchange, oxygen uptake, denitrification (acetylene blockage) and pore water nutnent concentration profiles were measured at intertidal sediment (predominantly silWclays) sites in the lower estuary of the nver Great Ouse, England. Sedments were consistent sinks for No3(310 pm01 m-2 h-', mean sites 4 to 9) and O2 (2800 pm01 m-2 h-', mean sites 4 to 7 ) , sources of NH,' (270 p o l m-2 h-', mean sites 4 to 9) but neutral with respect to NOzand urea Oxygen uptake was significantly correlated (p c 0.05) 14th seasonal temperature. Nitrate exchange became saturated at No3concentrations > 400 pM, at a rate of about 400 pm01 NO3m-' h-'. Denitrification accounted annually for 46% of the NO,exchanged into the sediments and approached asymptotic rates during spnng and summer at NO3concentrations > 400 yM. Of the total N flux through the sediments, NH,' efflux accounted for 51 %, whist 49% was converted to gases, compared to >90% in the upper estuary Freshwater flushlng tunes were calculated for a defined area of the estuary and ranged from 20.5 d in June to 3.25 d in November. Attenuation of the riverine total oxidlsed nitrogen (NO,+ NO2-) load to the estuary ranged from 1 % in the middle of winter to 56'::) at the height of summer and annually the sehments denitrified 38.4 Mm01 N. Recycling of nitrogen in the sedirnents, via N O 3 arnmonification (calculated by difference) and organic ammonification, generated an annual NH,' efflux of 128 Mm01 N, equivalent to 22% of the primary production N requirement in the Wash.

Nitrogen fluxes through the upper estuary of the Great Ouse, England:the role of the bottom sediments