Abstract
Sediment cores were collected from a Spartina alterniflora saltmarsh (dormant season) located in Barataria Basin, Louisiana, U.S.A. Highly N-15 labelled NH 4 + and NO 3 − sources were added and gaseous emission and entrapment of 15N 2 and N 2O resulting from nitrification/denitrification in the flooded sediments were investigated over 33 days. Denitrification of the surface-applied NO 3 − was rapid and significantly higher on all sampling dates compared with 15N 2 emissions from the NH 4 + treated sediment surfaces. Significant concentrations of 15N 2 and N 2O were entrapped in the NO 3 − treated sediments as compared with very low values of 15N 2 and N 2O accumulation in the sediment receiving added NH 4 +. Ratios of N 2 N 2O ranged from 3 to 250 with the lower ratios measured over the first 11 days. At the conclusion of the study, approximately 23% of the added 15NO 3 −N remained in the sediment columns compared with 90% for the 15NH 4 +N treatments.
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