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Tytuł:
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Effects of nitrate on phosphorus release from lake sediments.
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Autorzy:
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Ma SN; State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; School of Marine Sciences, Ningbo University, Ningbo 315832, China. Electronic address: .
Wang HJ; State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China. Electronic address: .
Wang HZ; State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China. Electronic address: .
Zhang M; State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: .
Li Y; State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China. Electronic address: .
Bian SJ; State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China. Electronic address: .
Liang XM; State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China. Electronic address: .
Søndergaard M; Department of Bioscience and Arctic Research Centre, Aarhus University, 8600 Silkeborg, Denmark; Sino-Danish Centre for Education and Research, Beijing 100049, China. Electronic address: .
Jeppesen E; Department of Bioscience and Arctic Research Centre, Aarhus University, 8600 Silkeborg, Denmark; Sino-Danish Centre for Education and Research, Beijing 100049, China; Limnology Laboratory, Department of Biological Sciences and Centre for Ecosystem Research and implementation, Middle East Technical University, Ankara 06800, Turkey; Institute of Marine Sciences, Middle East Technical University, 33731 Erdemli-Mersin, Turkey. Electronic address: .
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Źródło:
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Water research [Water Res] 2021 Apr 15; Vol. 194, pp. 116894. Date of Electronic Publication: 2021 Feb 02.
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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: Oxford, Pergamon Press.
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MeSH Terms:
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Lakes*
Water Pollutants, Chemical*/analysis
China ; Eutrophication ; Geologic Sediments ; Nitrates ; Phosphorus/analysis
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Contributed Indexing:
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Keywords: Alkaline phosphatase activity; Dual effect; Eutrophication; Oxidation of sediment; Sediment phosphorus release
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Substance Nomenclature:
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0 (Nitrates)
0 (Water Pollutants, Chemical)
27YLU75U4W (Phosphorus)
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Entry Date(s):
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Date Created: 20210216 Date Completed: 20210317 Latest Revision: 20210317
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Update Code:
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20240104
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DOI:
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10.1016/j.watres.2021.116894
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PMID:
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33592355
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Phosphorus (P) release from sediment is a key process affecting the effectiveness of eutrophication mitigation. We hypothesized that high nitrate (NO 3 - ) input may have dual effect on sediment P release: reduce the sediment P release by improving the oxidation of sediment or promote P release by stimulating the growth of phytoplankton and increase the decomposition rates and oxygen consumption at the sediment water interface. To test the effect of different NO 3 - concentrations, we conducted a three-month experiment in 15 cement tanks (1 m 3 ), with five targeted concentrations of NO 3 - : control, 2 mg L -1 , 5 mg L -1 , 10 mg L -1 , and 15 mg L -1 . The results showed that: i) when NO 3 - was maintained at high levels: NO 3 - ≥5-7 mg L -1 (range of median values), there was no effect of NO 3 - on net P release from the sediment, likely because the positive effects of NO 3 - (increasing oxidation) was counteracted by a promotion of phytoplankton growth. ii) after NO 3 - addition was terminated NO 3 - dropped sharply to a low level (NO 3 - ≤0.4 mg L -1 ), followed by a minor P release in the low N treatments but a significant P release in the high N treatments, which likely reflect that the inhibition effect of NO 3 - on P release decreased, while the promotion effects at high NO 3 - concentrations continued. The results thus supported our hypotheses of a dual effect on sediment P release and suggest dose-dependent effect of NO 3 - loading on stimulating P release from the sediment, being clear at high NO 3 - exceeding 5-7 mg L -1 .
Competing Interests: Declaration of Competing Interest No conflict of interests needs to be declared for the manuscript entitled.
(Copyright © 2021. Published by Elsevier Ltd.)
