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- Title
Nitrate Addition Increases the Activity of Microbial Nitrogen Removal in Freshwater Sediment.
- Authors
Cai, Min; Hong, Yiguo; Wu, Jiapeng; Moore, Selina Sterup; Vamerali, Teofilo; Ye, Fei; Wang, Yu
- Abstract
Denitrification and anammox occur widely in aquatic ecosystems serving vital roles in nitrogen pollution removal. However, small waterbodies are sensitive to external influences; stormwater runoff carrying nutrients and oxygen, flows into waterbodies resulting in a disruption of geochemical and microbial processes. Nonetheless, little is known about how these short-term external inputs affect the microbial processes of nitrogen removal in small waterbodies. To investigate the effects of NO3−, NH4+, dissolved oxygen (DO) and organic C on microbial nitrogen removal in pond sediments, regulation experiments have been conducted using slurry incubation experiments and 15N tracer techniques in this study. It was demonstrated the addition of NO3− (50 to 800 μmol L−1) significantly promoted denitrification rates, as expected by Michaelis-Menten kinetics. Ponds with higher NO3− concentrations in the overlying water responded more greatly to NO3− additions. Moreover, N2O production was also promoted by such an addition of NO3−. Denitrification was significantly inhibited by the elevation of DO concentration from 0 to 2 mg L−1, after which no significant increase in inhibition was observed. Denitrification rates increased when organic C was introduced. Due to the abundant NH4+ in pond sediments, the addition demonstrated little influence on nitrogen removal. Moreover, anammox rates showed no significant changes to any amendment.
- Subjects
RUNOFF; FRESH water; NITROGEN; PONDS; SEDIMENTS; BODIES of water; ATMOSPHERIC nitrogen
- Publication
Microorganisms, 2022, Vol 10, Issue 7, pN.PAG
- ISSN
2076-2607
- Publication type
Article
- DOI
10.3390/microorganisms10071429