Biosensor Determination of the Microscale Distribution of Nitrate, Nitrate Assimilation, Nitrification, and Denitrification in a Diatom-Inhabited Freshwater Sediment
| Autor: | Lars Hauer Larsen, Niels Peter Revsbech, Thomas Kjaer, Jan Lorenzen |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Denitrification
Ecology Nitrogen assimilation Sediment General Microbial Ecology Biology biology.organism_classification Applied Microbiology and Biotechnology chemistry.chemical_compound Diatom Nitrate chemistry Benthic zone Environmental chemistry Nitrification Nitrogen cycle Food Science Biotechnology |
| Zdroj: | Applied and Environmental Microbiology. 64:3264-3269 |
| ISSN: | 1098-5336 0099-2240 |
| Popis: | High-resolution NO 3 − profiles in freshwater sediment covered with benthic diatoms were obtained with a new microscale NO 3 − biosensor characterized by absence of interference from chemical species other than NO 2 − and N 2 O. Analysis of the microprofiles obtained indicated no nitrification during darkness, high rates of nitrification and a tight coupling between nitrification and denitrification during illumination, and substantial rates of NO 3 − assimilation during illumination. Nitrification during darkness could be induced by purging the bulk water with O 2 gas, indicating that the stimulatory effect on nitrification by illumination was caused by algal production of O 2 . NH 4 + addition did not stimulate nitrification during darkness when O 2 was restricted to the upper 1-mm layer, and there was thus a low nitrification potential in the permanently oxic top 1 mm of the sediment. |
| Databáze: | OpenAIRE |
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