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Denitrification in exposed intertidal sediment was measured for the first time at locations in the Tagus Estuary, using a new ammonium spray method. With this method, 15 NH 4 + was sprayed on to the sediment surface, and nitrification-denitrification was subsequently estimated from accumulation of 29 N 2 and 30 N 2 in gas-tight glass chambers placed on the 15 N-labeled sediment. Coupled nitrification-denitrification ranged from 8.5 to 11.5 μmol N m -2 h -1 at night to below 2 pmol N m -2 h -1 during the day. Salt stress, light inhibition and depletion of NH 4 + by benthic diatoms could contribute to the low daytime activity. The nighttime rates were confirmed by an independent estimate based on potential nitrification-denitrification and oxygen uptake. Coupled nitrification-denitrification activity at night during exposure was not significantly different from the activity measured when the sediment was inundated, but was 3 times lower than rates measured at a subtidal station in the estuary.

Denitrification in exposed intertidal mud-flats, measured with a new 15N-ammonium spray technique