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• W4286508620 abstract "The coupling between nitrification and denitrification/anammox (nitrate/nitrite used in denitrification/anammox derives from nitrification) is a significant process of reactive nitrogen (N) removal that has attracted much attention. However, the dynamics of coupled nitrification-denitrification/anammox in the periodically low-oxygen estuaries and coasts remain unclear. Here, continuous-flow experiments combined with isotope tracing techniques were conducted in periodically low-oxygen areas of the Yangtze Estuary to reveal the changes in benthic sediment denitrification and anammox as well as their coupling with nitrification. Our results showed that denitrification increased but anammox decreased during low-oxygen summer. The occurrence of low oxygen also promoted coupled nitrification-denitrification but decreased coupled nitrification-anammox. These results implied that decreased dissolved oxygen in summer did not largely restrict nitrification activity, and anaerobic denitrification/anammox regulated the magnitude of coupled nitrification-denitrification/anammox rates. Denitrification (74.95–100 %) was the dominant process in total N removal, while coupled nitrification-denitrification accounted for a higher proportion (45.68–97.05 %) of denitrification, indicating that coupling between nitrification and denitrification played a dominant role in N removal. In addition to dissolved oxygen levels, carbon and N substrate availabilities were also important variables to regulate N transformations. Overall, this study advanced our knowledge of the distribution patterns and controlling factors of N removal processes and highlighted that coupled nitrification-denitrification might have a significant but neglected role in N removal from periodically low-oxygen estuaries." @default.
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• W4286508620 date "2022-11-01" @default.
• W4286508620 modified "2023-10-16" @default.
• W4286508620 title "High importance of coupled nitrification-denitrification for nitrogen removal in a large periodically low-oxygen estuary" @default.
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• W4286508620 doi "https://doi.org/10.1016/j.scitotenv.2022.157516" @default.
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