Denitrification potential of a salt marsh soil: Effect of temperature,pH and substrate concentration |
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| Authors: | Usha S George Alan D Antoine |
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| Institution: | Department of Biochemistry and Microbiology, Rutgers— The State University of New Jersey, New Brunswick, NJ 08903, U.S.A. |
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| Abstract: | Denitrification was studied using samples of salt marsh soils collected from the New Jersey coast. The pH, organic matter content, NO3? and NO2? concentrations were determined on samples from marshes with and without grasses. Denitrification was measured in laboratory studies over a temperature range from 4° to 60°C and a pH range from 5.0 to 9.0 by monitoring NO3? reduction, NO2? reduction and N2 evolution. Optimum conditions were controlled by a temperature-pH interaction which caused shifts in the pH optima relative to the change in temperature. No3? and NO2? were reduced over a broad range of No3? concentration; whereas, 0.2 mg NO2?-N ml?1 completely inhibited denitrification. The presence of NO3? reverses this inhibition. N2O was produced only at low pH values and low NO3? concentrations. It was concluded that the NO2? reducing system was the most easily disrupted of the three main processes of denitrification. |
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