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Nitrous oxide (N 2 O) 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 N 2 O emission rates were calculated. The greatest rates for both N 2 O production and denitrification were measured from saltmarsh cores. These were 1032 µmol N 2 O m −2 day −1 and 2518 µmol N 2 m −2 day −1 , respectively, from the Couesnon and 109 µmol N 2 O m −2 day −1 and 303 µmol N 2 m −2 day −1 from the Torridge. A strong positive correlation was apparent with N 2 O emission rates and ammonium concentration in the sediment, nitrate concentration in floodwater and sediment aerobicity.

Nitrous oxide (N 2 O) 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 N 2 O emission rates were calculated. The greatest rates for both N 2 O production and denitrification were measured from saltmarsh cores. These were 1032 µmol N 2 O m −2 day −1 and 2518 µmol N 2 m −2 day −1 , respectively, from the Couesnon and 109 µmol N 2 O m −2 day −1 and 303 µmol N 2 m −2 day −1 from the Torridge. A strong positive correlation was apparent with N 2 O emission rates and ammonium concentration in the sediment, nitrate concentration in floodwater and sediment aerobicity.

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