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The release of nitrous oxide from the intertidal zones of two European estuaries in response to increased ammonium and nitrate loading |
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| Authors: | C Kenny S Yamulki M Blackwell E Maltby P French F Birgand |
| Institution: | 1. Institute of Grassland and Environmental Research, North Wyke, Okehampton, Devon, EX20 2SB, U.K. 2. Royal Holloway Institute for Environmental Research, Huntersdale, Callow Hill, Virginia Water, Surrey, GU25 4LN, U.K. 3. Department of Geography, Royal Holloway University of London, Egham, Surrey, TW20 0EX, U.K. 4. Cemagref, 17 Avenue de Cucillé, 35044, Rennes, France |
| 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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