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Microscale Distribution of Nitrification Activity in Sediment Determined with a Shielded Microsensor for Nitrate

Microscale Distribution of Nitrification Activity in Sediment Determined with a Shielded... Microscale Distribution of Nitrification Activity in Sediment Determined with a Shielded Microsensor for Nitrate Kim Jensen * , Niels Peter Revsbech and Lars Peter Nielsen Department of Microbial Ecology, Institute of Biological Sciences, University of Aarhus, Ny Munkegade, DK-8000 Aarhus C, Denmark ABSTRACT Microprofiles of O 2 and NO 3 - were measured simultaneously in freshwater sediment with microsensors which were completely free from electrical interference because of coaxial designs. Depth profiles of nitrification (NO 3 - production) and denitrification (NO 3 - consumption) were subsequently determined by computer simulation of the measured microprofiles. The nitrifying bacterial community responded very quickly to changes in environmental conditions, and new steady-state microprofiles of O 2 and NO 3 - were usually approached within a few hours after perturbation. Nitrification started quickly after introduction of O 2 in previously anoxic layers, suggesting prolonged survival of the nitrifiers during anaerobiosis. Changes in the availability of O 2 and NH 4 + greatly affected the nitrification profile, and there was a high rate of coupled nitrification-denitrification under conditions in which nitrification occurred right above the oxic-anoxic interface. Addition of C 2 H 2 rapidly removed the NO 3 - peaks, indicating that NO 3 - production was due mainly to autotrophic nitrification. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Applied and Environmental Microbiology American Society For Microbiology

Microscale Distribution of Nitrification Activity in Sediment Determined with a Shielded Microsensor for Nitrate

Microscale Distribution of Nitrification Activity in Sediment Determined with a Shielded Microsensor for Nitrate

Applied and Environmental Microbiology , Volume 59 (10): 3287 – Oct 1, 1993

Abstract

Microscale Distribution of Nitrification Activity in Sediment Determined with a Shielded Microsensor for Nitrate Kim Jensen * , Niels Peter Revsbech and Lars Peter Nielsen Department of Microbial Ecology, Institute of Biological Sciences, University of Aarhus, Ny Munkegade, DK-8000 Aarhus C, Denmark ABSTRACT Microprofiles of O 2 and NO 3 - were measured simultaneously in freshwater sediment with microsensors which were completely free from electrical interference because of coaxial designs. Depth profiles of nitrification (NO 3 - production) and denitrification (NO 3 - consumption) were subsequently determined by computer simulation of the measured microprofiles. The nitrifying bacterial community responded very quickly to changes in environmental conditions, and new steady-state microprofiles of O 2 and NO 3 - were usually approached within a few hours after perturbation. Nitrification started quickly after introduction of O 2 in previously anoxic layers, suggesting prolonged survival of the nitrifiers during anaerobiosis. Changes in the availability of O 2 and NH 4 + greatly affected the nitrification profile, and there was a high rate of coupled nitrification-denitrification under conditions in which nitrification occurred right above the oxic-anoxic interface. Addition of C 2 H 2 rapidly removed the NO 3 - peaks, indicating that NO 3 - production was due mainly to autotrophic nitrification.

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Publisher
American Society For Microbiology
Copyright
Copyright © 1993 by the American society for Microbiology.
ISSN
0099-2240
eISSN
1098-5336
Publisher site
See Article on Publisher Site

Abstract

Microscale Distribution of Nitrification Activity in Sediment Determined with a Shielded Microsensor for Nitrate Kim Jensen * , Niels Peter Revsbech and Lars Peter Nielsen Department of Microbial Ecology, Institute of Biological Sciences, University of Aarhus, Ny Munkegade, DK-8000 Aarhus C, Denmark ABSTRACT Microprofiles of O 2 and NO 3 - were measured simultaneously in freshwater sediment with microsensors which were completely free from electrical interference because of coaxial designs. Depth profiles of nitrification (NO 3 - production) and denitrification (NO 3 - consumption) were subsequently determined by computer simulation of the measured microprofiles. The nitrifying bacterial community responded very quickly to changes in environmental conditions, and new steady-state microprofiles of O 2 and NO 3 - were usually approached within a few hours after perturbation. Nitrification started quickly after introduction of O 2 in previously anoxic layers, suggesting prolonged survival of the nitrifiers during anaerobiosis. Changes in the availability of O 2 and NH 4 + greatly affected the nitrification profile, and there was a high rate of coupled nitrification-denitrification under conditions in which nitrification occurred right above the oxic-anoxic interface. Addition of C 2 H 2 rapidly removed the NO 3 - peaks, indicating that NO 3 - production was due mainly to autotrophic nitrification.

Journal

Applied and Environmental MicrobiologyAmerican Society For Microbiology

Published: Oct 1, 1993

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