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Tytuł:
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Nitrogen loads alter the N 2 production between denitrification and anammox in Min River Estuary, a highly impacted estuary in southeast China.
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Autorzy:
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Li X; State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200241, China; Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education, Fujian Normal University, Fuzhou, 350007, China. Electronic address: .
Gao D; State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200241, China.
Hou L; State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200241, China.
Qian W; Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education, Fujian Normal University, Fuzhou, 350007, China.
Liu M; Key Laboratory of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, Shanghai, 200241, China.
Zeng H; Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education, Fujian Normal University, Fuzhou, 350007, China.
Chen Z; Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education, Fujian Normal University, Fuzhou, 350007, China.
Tong C; Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education, Fujian Normal University, Fuzhou, 350007, China.
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Źródło:
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Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2021 May 15; Vol. 277, pp. 116757. Date of Electronic Publication: 2021 Feb 22.
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Typ publikacji:
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Journal Article
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Język:
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English
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Imprint Name(s):
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Original Publication: Barking, Essex, England : Elsevier Applied Science Publishers, c1987-
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MeSH Terms:
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Estuaries*
Nitrogen*/analysis
China ; Denitrification ; Humans ; Oxidation-Reduction ; Rivers
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Contributed Indexing:
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Keywords: Anammox; Denitrification; Land use; Min river estuary; N loads
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Substance Nomenclature:
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N762921K75 (Nitrogen)
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Entry Date(s):
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Date Created: 20210301 Date Completed: 20210413 Latest Revision: 20210413
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Update Code:
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20240105
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DOI:
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10.1016/j.envpol.2021.116757
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PMID:
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33647804
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Estuarine sediment denitrification and anammox in response to increased nitrogen (N) loads remain poorly understood. In this study, we used N isotope tracer approach to investigate the spatial distribution of denitrification and anammox and identified the crucial controls on the partitioning of dinitrogen gas (N 2 ) production along the Min River Estuary (MRE), a highly impacted estuary in southeast China. The results indicated that denitrification and anammox rates ranged from 10.5 to 70.7 nmol g -1 h -1 and from 0.44 to 4.31 nmol g -1 h -1 , respectively. Relative contribution of anammox to N 2 production (R a ) was in a range of 1.04-15.1%, tending to increase toward estuary mouth. Denitrification rates were significantly higher in upper (high N loads) than in lower estuary (low N loads), while anammox rates and R a showed inverse distributions along the MRE. Wastewater discharge caused the N point pollution triggering denitrification but inhibiting anammox. The best predictor of the variations in denitrification rates was total nitrogen, whereas pH and NH 4 + could explained the variations in anammox rates across the estuary. The crucial predictors for the partitioning of N 2 production between denitrification and anammox were NH 4 + and NO x - . These results suggest that the increase in human activities intensity can alter the partitioning of N 2 production between denitrification and anammox, and the magnitude of this switch can be predicted by N loads in MRE and other highly impacted estuaries.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2021 Elsevier Ltd. All rights reserved.)
