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The acetylene block technique was employed to study denitrification in intertidal estuarine sediments. Addition of nitrate to sediment slurries stimulated denitrification. During the dry season, sediment-slurry denitrification rates displayed Michaelis-Menten kinetics, and ambient NO3 − + NO2 − concentrations (≤26 μM) were below the apparentK m (50 μM) for nitrate. During the rainy season, when ambient NO3 − + NO2 − concentrations were higher (37 to 89 μM), an accurate estimate of theK m could not be obtained. Endogenous denitrification activity was confined to the upper 3 cm of the sediment column. However, the addition of nitrate to deeper sediments demonstrated immediate N2 O production, and potential activity existed at all depths sampled (the deepest was 15 cm). Loss of N2 O in the presence of C2 H2 was sometimes observed during these short-term sediment incubations. Experiments with sediment slurries and washed cell suspensions of a marine pseudomonad confirmed that this N2 O loss was caused by incomplete blockage of N2 O reductase by C2 H2 at low nitrate concentrations. Areal estimates of denitrification (in the absence of added nitrate) ranged from 0.8 to 1.2 μmol of N2 m−2 h−1 (for undisturbed sediments) to 17 to 280 μmol of N2 m−2 h−1 (for shaken sediment slurries).

Denitrification in San Francisco Bay Intertidal Sediments