Physics
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47.1805s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 47, Issue 10, pp.1805-1814
Physics
4
Scientific paper
Nitrous oxide evolution may contribute to partial destruction of the ozone layer in the stratosphere. A two year study of the release of N 2 O from adjoining salt, brackish, and fresh marsh sediment indicates that the annual emission was 31, 48, and 55 mg N m -2 respectively. Emission from open water area was less than the corresponding emission from the marsh sediment. In vitro experiments indicate that the N 2 O emission was increased when the sediment was drained for extended periods of time. The addition of NO 3 - significantly increased the rate of N 2 O evolution, indicating that a large potential for denitrification exists in the anoxic sediment. Appreciable losses of N 2 O would only be expected when the marshes receive an extraneous source of nitrate such as sewage and/or wastewater. The contribution of the Gulf Coast wetlands to the atmospheric N 2 O balance is estimated to be 3.3 × 10 9 g N 2 O. The maximum average daily emission was equivalent to 1.5 g N 2 O-N ha -1 , which is less than the measured emission from uncultivated soils ( et al ., 1981) but greater than the estimates from noncropped land (CAST, 1976).
Delaune R. D.
Patrick H. Jr. W.
Smith Calvin J.
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