Abstract
Nitrous oxide (N2O) release and denitrification rates were investigated from the intertidal saltmarsh and mudflats of two European river estuaries, the Couesnon in Normandy, France and the Torridge in Devon, UK. Sediment cores and water were collected from each study site and incubated for 72 h in tidal simulation chambers. Gas samples were collected at 6 and 12 h intervals from the chambers during incubation. From these N2O emission rates were calculated. The greatest rates for both N2O production and denitrification were measured from saltmarsh cores. These were 1032 µmol N2O m−2 day−1 and 2518 µmol N2 m−2 day−1, respectively, from the Couesnon and 109 µmol N2O m−2 day−1 and 303 µmol N2 m−2 day−1 from the Torridge. A strong positive correlation was apparent with N2O emission rates and ammonium concentration in the sediment, nitrate concentration in floodwater and sediment aerobicity.
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