Capacity for Denitrification and Reduction of Nitrate to Ammonia in a Coastal Marine Sediment

AUTOR(ES)

Sørensen, Jan

RESUMO

The capacity for dissimilatory reduction of NO3− to N2 (N2O) and NH4+ was measured in 15NO3−-amended marine sediment. Incubation with acetylene (7 × 10−3 atmospheres [normal]) caused accumulation of N2O in the sediment. The rate of N2O production equaled the rate of N2 production in samples without acetylene. Complete inhibition of the reduction of N2O to N2 suggests that the “acetylene blockage technique” is applicable to assays for denitrification in marine sediments. The capacity for reduction of NO3− by denitrification decreased rapidly with depth in the sediment, whereas the capacity for reduction of NO3− to NH4+ was significant also in deeper layers. The data suggested that the latter process may be equally as significant as denitrification in the turnover of NO3− in marine sediments.

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