Denitrification and Nitrogen Fixation in Alaskan Continental Shelf Sediments
Rates of nitrogen fixation and denitrification were measured in Alaskan continental shelf sediments. In some regions, rates of nitrogen fixation and denitrification appeared to be equal; in other areas, rates were significantly different. Potential rates of denitrification were found to be limited p...
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ftpubmed:oai:pubmedcentral.nih.gov:243709 2023-05-15T15:43:42+02:00 Denitrification and Nitrogen Fixation in Alaskan Continental Shelf Sediments Haines, John R. Atlas, Ronald M. Griffiths, Robert P. Morita, Richard Y. 1981-02 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC243709 http://www.ncbi.nlm.nih.gov/pubmed/16345716 en eng http://www.ncbi.nlm.nih.gov/pmc/articles/PMC243709 http://www.ncbi.nlm.nih.gov/pubmed/16345716 General Microbial Ecology Text 1981 ftpubmed 2013-08-29T16:07:54Z Rates of nitrogen fixation and denitrification were measured in Alaskan continental shelf sediments. In some regions, rates of nitrogen fixation and denitrification appeared to be equal; in other areas, rates were significantly different. Potential rates of denitrification were found to be limited primarily by the available nitrate substrate. Major regional differences in rates of denitrification were not statistically significant, but significant differences were found for nitrogen fixation rates in different regions of the Alaskan continental shelf. Estimated net losses of nitrogen from Bering Sea sediments were calculated as 1.8 × 1012 g of N/yr. Experimental exposure of continental shelf sediments to petroleum hydrocarbons reduced rates of nitrogen fixation and denitrification in some cases but not others. Long-term exposure was necessary before a reduction in nitrogen fixation rates was observed; unamended rates of denitrification but not potential denitrification rates (NO3− added) were depressed after exposure to hydrocarbons. Text Bering Sea PubMed Central (PMC) Bering Sea |
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English |
topic |
General Microbial Ecology |
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General Microbial Ecology Haines, John R. Atlas, Ronald M. Griffiths, Robert P. Morita, Richard Y. Denitrification and Nitrogen Fixation in Alaskan Continental Shelf Sediments |
topic_facet |
General Microbial Ecology |
description |
Rates of nitrogen fixation and denitrification were measured in Alaskan continental shelf sediments. In some regions, rates of nitrogen fixation and denitrification appeared to be equal; in other areas, rates were significantly different. Potential rates of denitrification were found to be limited primarily by the available nitrate substrate. Major regional differences in rates of denitrification were not statistically significant, but significant differences were found for nitrogen fixation rates in different regions of the Alaskan continental shelf. Estimated net losses of nitrogen from Bering Sea sediments were calculated as 1.8 × 1012 g of N/yr. Experimental exposure of continental shelf sediments to petroleum hydrocarbons reduced rates of nitrogen fixation and denitrification in some cases but not others. Long-term exposure was necessary before a reduction in nitrogen fixation rates was observed; unamended rates of denitrification but not potential denitrification rates (NO3− added) were depressed after exposure to hydrocarbons. |
format |
Text |
author |
Haines, John R. Atlas, Ronald M. Griffiths, Robert P. Morita, Richard Y. |
author_facet |
Haines, John R. Atlas, Ronald M. Griffiths, Robert P. Morita, Richard Y. |
author_sort |
Haines, John R. |
title |
Denitrification and Nitrogen Fixation in Alaskan Continental Shelf Sediments |
title_short |
Denitrification and Nitrogen Fixation in Alaskan Continental Shelf Sediments |
title_full |
Denitrification and Nitrogen Fixation in Alaskan Continental Shelf Sediments |
title_fullStr |
Denitrification and Nitrogen Fixation in Alaskan Continental Shelf Sediments |
title_full_unstemmed |
Denitrification and Nitrogen Fixation in Alaskan Continental Shelf Sediments |
title_sort |
denitrification and nitrogen fixation in alaskan continental shelf sediments |
publishDate |
1981 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC243709 http://www.ncbi.nlm.nih.gov/pubmed/16345716 |
geographic |
Bering Sea |
geographic_facet |
Bering Sea |
genre |
Bering Sea |
genre_facet |
Bering Sea |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC243709 http://www.ncbi.nlm.nih.gov/pubmed/16345716 |
_version_ |
1766377902529576960 |