Journal
MARINE POLLUTION BULLETIN
Volume 153, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2020.110971
Keywords
Denitrification; Nitrogen; nirS gene; The Indus River Estuary
Funding
- National Natural Science Foundation of China [41725002, 41671463, 41761144062, 41730646, 41601530, 41971105]
- Chinese National Key Programs for Fundamental Research and Development [2016YFA0600904, 2016YFE0133700]
- Yangtze Delta Estuarine Wetland Station, East China Normal University
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Denitrification is an important pathway for reactive nitrogen removal from aquatic ecosystems. In this study, the biodiversity, abundance, and activity of cytochrome cd(1)-type nitrate reductase gene (nirS)-harboring denitrifiers in the sediments of the Indus River Estuary were examined by molecular and isotope-tracing techniques. Results showed that the nirS-harboring denitrifier communities showed significant geographical variations along the estuarine salinity gradient. Real-time quantitative PCR showed that the abundance of nirS-harboring denitrifiers ranged from 5.3 x 10(6) to 2.5 x 10(8) copies g(-1), without significant spatiotemporal variation. The potential rates of denitrification varied from 0.01 to 6.27 mu mol N kg(-1) h(-1) and correlated significantly to TOC and Fe(II) (P < 0.05). On the basis of N-15 isotope-tracing experiments, the denitrification process contributed 18.4-99.4% to the total nitrogen loss in the sediments of the Indus River Estuary. This study provides novel insights into the microbial mechanism of nitrogen removal process in estuarine ecosystems.
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