Physics
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44.1853s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 44, Issue 11, pp.1853-1855
Physics
6
Scientific paper
Methods were developed for determining rates of denitrification in coastal marine sediments by measuring the production of N 2 from undisturbed cores incubated in gas-tight chambers. Denitrification rates at summer temperatures (23°C) in sediment cores from Narragansett Bay, Rhode Island, were about 50 mol N 2 m -2 hr -1 . This nitrogen flux is equal to approximately one-half of the NH + 4 flux from the sediments at this temperature and is of the magnitude necessary to account for the anomalously low N/P and anomalously high O/N ratios often reported for benthic nutrient fluxes. The loss of fixed nitrogen as N 2 during the benthic remineralization of organic matter, coupled with the importance of benthic remineralization processes in shallow coastal waters may help to explain why the availability of fixed nitrogen is a major factor limiting primary production in these areas. Narragansett Bay sediments are also a source of N 2 O, but the amount of nitrogen involved was only about 0.2 mol m -2 hr -1 at 23°C.
Burke Suzanne
Nixon Scott
Pilson Michael E. Q.
Seitzinger Sbil
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