Effect of a cold shock on the activity and composition of the communities of ammonium-oxidizing microorganisms in a chestnut soil

The simulation of a cold shock was performed in an incubation experiment with soil microcosms by a sharp decrease of the temperature to negative values and the subsequent analysis of the nitrification rate of the ammonium-oxidizing microorganisms. Three procedures of the cold shock effect were selec...

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Bibliographic Details
Published in:Eurasian soil science 2012-05, Vol.45 (5), p.514-520
Main Authors: Cherobaeva, A. S., Stepanov, A. L., Kravchenko, I. K.
Format: Article
Language:English
Subjects:
Ammonium
Analysis
Earth and Environmental Science
Earth Sciences
Geotechnical Engineering & Applied Earth Sciences
High temperature
Low temperature
Microbiology
Microorganisms
Nitrification
Simulation
Soil Biology
Soil microbiology
Soil sciences
Temperature
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Summary:The simulation of a cold shock was performed in an incubation experiment with soil microcosms by a sharp decrease of the temperature to negative values and the subsequent analysis of the nitrification rate of the ammonium-oxidizing microorganisms. Three procedures of the cold shock effect were selected: long, short-time, and cyclic. A significant decrease of the nitrifying activity was recorded after the long effect, whereas the 8-, 16-, and 24-hour cold shocks did not affect the intensity of nitrification. A cyclic temperature decrease alternating with periods of incubation under high temperatures also did not affect the nitrifying activity of the microorganisms. We suppose that the domination of mesophilic microorganisms with a resistant enzyme system or of psychrophilic and psychrotolerant microorganisms contributes to the preservation of a high nitrification level in soils with frequent alternations of high and low temperatures.
ISSN:1064-2293
1556-195X
DOI:10.1134/S1064229312050031