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An experimental study on effects of submersed macrophytes on nitrification and denitrification in ammonium-rich aquatic systems
Limnology, Department of Ecology, Lund University, Lund, Sweden .
Limnology, Department of Ecology, Lund University, Lund, Sweden.ORCID-id: 0000-0002-5181-0391
1999 (Engelska)Ingår i: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 44, nr 8, s. 1993-1999Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We have examined the role of microbial communities on the surface of submersed macrophytes and in the underlying sediment for nitrification and denitrification in light and dark in NH(4)(+)-enriched microcosm systems using isotope pairing and dilution techniques. Potamogeton pectinatus L. and intact sediment cores were collected in a shallow reservoir receiving treated municipal wastewater and containing dense submersed vegetation. Chambers containing P. pectinatus shoots, sediment, or both P. pectinatus shoots and sediment were exposed to 6 h of darkness, 6 h of light, and 6 h of darkness. (14)NH(4)(+) and (15)NO(3)(-) were added at ambient concentrations of 15 and 5 mg N liter(-1), respectively. NH(4)(+) was primarily nitrified in the epiphytic microbial communities, and NO; was denitrified in the underlying sediment. In chambers containing macrophytes, there was a net production of O(2) and NO(3)(-) in light and a net consumption in dark, and nitrification was higher in light than in dark. In chambers with only sediment, there was always a net consumption of NO(3)(-), and nitrification was similar in light and dark. The results show that submersed macrophytes can be important for the N metabolism in NH(4)(+)-rich freshwaters (e.g., wastewater treatment systems) by stimulating nitrification through providing surfaces for attached nitrifying bacteria and possibly also through diurnal changes in the water chemistry.

Ort, förlag, år, upplaga, sidor
Waco, United States: American Society of Limnology and Oceanography, Inc. , 1999. Vol. 44, nr 8, s. 1993-1999
Nationell ämneskategori
Ekologi
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URN: urn:nbn:se:hh:diva-27655ISI: 000084125600014Scopus ID: 2-s2.0-0032715846OAI: oai:DiVA.org:hh-27655DiVA, id: diva2:784956
Tillgänglig från: 2015-02-01 Skapad: 2015-02-01 Senast uppdaterad: 2017-12-05Bibliografiskt granskad

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