Bacterial immobilization and remineralization of N at different growth rates and N concentrations
(2005) In FEMS Microbiology Ecology 54(1). p.13-19- Abstract
- An experiment was designed to resolve two largely unaddressed questions about the turnover of N in soils. One is the influence of microbial growth rate on mobilization and remineralization of cellular N. The other is to what extent heterotrophic immobilization of NO3- is controlled by the soil concentration of NH4+. Bacteria were extracted from a deciduous forest soil and inoculated into an aqueous medium. Various N pool dilution/enrichment experiments were carried out to: (1) calculate the gross N immobilization and remineralization rates; (2) investigate their dependence on NH4+ and NO3- concentrations; (3) establish the microbial preference for NH4+ and NO3- depending on the NH4+/NO3- concentration ratio. Remineralization of microbial N... (More)
- An experiment was designed to resolve two largely unaddressed questions about the turnover of N in soils. One is the influence of microbial growth rate on mobilization and remineralization of cellular N. The other is to what extent heterotrophic immobilization of NO3- is controlled by the soil concentration of NH4+. Bacteria were extracted from a deciduous forest soil and inoculated into an aqueous medium. Various N pool dilution/enrichment experiments were carried out to: (1) calculate the gross N immobilization and remineralization rates; (2) investigate their dependence on NH4+ and NO3- concentrations; (3) establish the microbial preference for NH4+ and NO3- depending on the NH4+/NO3- concentration ratio. Remineralization of microbial N occurred mainly at high growth rates and NH4+ concentrations. There was a positive correlation between NH4+ immobilization and remineralization rates, and intracellular recycling of N seemed to be an efficient way for bacteria to withstand low inorganic N concentrations. Thus, extensive remineralization of microbial N is likely to occur only when environmental conditions promote high growth rates. The results support previous observations of high NO3- immobilization rates, especially at low NH4+ concentrations, but NO3- was also immobilized at high NH4 concentrations. The latter can be understood if part of the microbial community has a preference for NO3- over NH4+ (c) 2005 Federation of European Microbiological Societies. Published by Elsevier B.V. All rights reserved. (Less)
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https://lup.lub.lu.se/record/146115
- author
- Bengtson, Per LU and Bengtsson, Göran LU
- organization
- publishing date
- 2005
- type
- Contribution to journal
- publication status
- published
- subject
- in
- FEMS Microbiology Ecology
- volume
- 54
- issue
- 1
- pages
- 13 - 19
- publisher
- Oxford University Press
- external identifiers
-
- wos:000231548300002
- pmid:16329968
- scopus:23744432477
- ISSN
- 1574-6941
- DOI
- 10.1016/j.femsec.2005.02.006
- language
- English
- LU publication?
- yes
- id
- cd48f86c-c68e-4c0b-8471-920d0447d7bf (old id 146115)
- date added to LUP
- 2016-04-01 16:17:26
- date last changed
- 2022-01-28 18:39:27
@article{cd48f86c-c68e-4c0b-8471-920d0447d7bf,
abstract = {{An experiment was designed to resolve two largely unaddressed questions about the turnover of N in soils. One is the influence of microbial growth rate on mobilization and remineralization of cellular N. The other is to what extent heterotrophic immobilization of NO3- is controlled by the soil concentration of NH4+. Bacteria were extracted from a deciduous forest soil and inoculated into an aqueous medium. Various N pool dilution/enrichment experiments were carried out to: (1) calculate the gross N immobilization and remineralization rates; (2) investigate their dependence on NH4+ and NO3- concentrations; (3) establish the microbial preference for NH4+ and NO3- depending on the NH4+/NO3- concentration ratio. Remineralization of microbial N occurred mainly at high growth rates and NH4+ concentrations. There was a positive correlation between NH4+ immobilization and remineralization rates, and intracellular recycling of N seemed to be an efficient way for bacteria to withstand low inorganic N concentrations. Thus, extensive remineralization of microbial N is likely to occur only when environmental conditions promote high growth rates. The results support previous observations of high NO3- immobilization rates, especially at low NH4+ concentrations, but NO3- was also immobilized at high NH4 concentrations. The latter can be understood if part of the microbial community has a preference for NO3- over NH4+ (c) 2005 Federation of European Microbiological Societies. Published by Elsevier B.V. All rights reserved.}},
author = {{Bengtson, Per and Bengtsson, Göran}},
issn = {{1574-6941}},
language = {{eng}},
number = {{1}},
pages = {{13--19}},
publisher = {{Oxford University Press}},
series = {{FEMS Microbiology Ecology}},
title = {{Bacterial immobilization and remineralization of N at different growth rates and N concentrations}},
url = {{http://dx.doi.org/10.1016/j.femsec.2005.02.006}},
doi = {{10.1016/j.femsec.2005.02.006}},
volume = {{54}},
year = {{2005}},
}