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Effect of drying and rewetting on bacterial growth rates in soil.

Iovieno, Paola and Bååth, Erland LU (2008) In FEMS Microbiology Ecology 65(3). p.400-407
Abstract
The effect of soil moisture on bacterial growth was investigated, and the effects of rewetting were compared with glucose addition because both treatments increase substrate availability. Bacterial growth was estimated as thymidine and leucine incorporation, and was compared with respiration. Low growth rates were found in air-dried soil, increasing rapidly to high stable values in moist soils. Respiration and bacterial growth at different soil moisture contents were correlated. Rewetting air-dried soil resulted in a linear increase in bacterial growth with time, reaching the levels in moist soil (10 times higher) after about 7 h. Respiration rates increased within 1 h to a level >10 times higher than that in moist soil. After the... (More)
The effect of soil moisture on bacterial growth was investigated, and the effects of rewetting were compared with glucose addition because both treatments increase substrate availability. Bacterial growth was estimated as thymidine and leucine incorporation, and was compared with respiration. Low growth rates were found in air-dried soil, increasing rapidly to high stable values in moist soils. Respiration and bacterial growth at different soil moisture contents were correlated. Rewetting air-dried soil resulted in a linear increase in bacterial growth with time, reaching the levels in moist soil (10 times higher) after about 7 h. Respiration rates increased within 1 h to a level >10 times higher than that in moist soil. After the initial flush, there was a gradual decrease in respiration rate, while bacterial growth increased to levels twice that of moist soil 24 h after rewetting, and decreased to levels similar to those in moist soil after 2 days. Adding glucose resulted in no positive effect on bacterial growth during the first 9 h, despite resulting in more than five times higher respiration. This indicated that the initial increase in bacterial growth after rewetting was not due to increased substrate availability. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
leucine incorporation, thymidine incorporation, bacterial growth, rewetting, soil moisture, respiration
in
FEMS Microbiology Ecology
volume
65
issue
3
pages
400 - 407
publisher
Elsevier
external identifiers
  • wos:000258291600005
  • scopus:49249127270
ISSN
1574-6941
DOI
10.1111/j.1574-6941.2008.00524.x
project
Responses of soil microbes to drought and rewetting
language
English
LU publication?
yes
id
846ab61e-3772-41a0-9db8-0074377c6948 (old id 1168901)
date added to LUP
2009-03-06 12:52:33
date last changed
2017-11-05 03:57:09
@article{846ab61e-3772-41a0-9db8-0074377c6948,
  abstract     = {The effect of soil moisture on bacterial growth was investigated, and the effects of rewetting were compared with glucose addition because both treatments increase substrate availability. Bacterial growth was estimated as thymidine and leucine incorporation, and was compared with respiration. Low growth rates were found in air-dried soil, increasing rapidly to high stable values in moist soils. Respiration and bacterial growth at different soil moisture contents were correlated. Rewetting air-dried soil resulted in a linear increase in bacterial growth with time, reaching the levels in moist soil (10 times higher) after about 7 h. Respiration rates increased within 1 h to a level >10 times higher than that in moist soil. After the initial flush, there was a gradual decrease in respiration rate, while bacterial growth increased to levels twice that of moist soil 24 h after rewetting, and decreased to levels similar to those in moist soil after 2 days. Adding glucose resulted in no positive effect on bacterial growth during the first 9 h, despite resulting in more than five times higher respiration. This indicated that the initial increase in bacterial growth after rewetting was not due to increased substrate availability.},
  author       = {Iovieno, Paola and Bååth, Erland},
  issn         = {1574-6941},
  keyword      = {leucine incorporation,thymidine incorporation,bacterial growth,rewetting,soil moisture,respiration},
  language     = {eng},
  number       = {3},
  pages        = {400--407},
  publisher    = {Elsevier},
  series       = {FEMS Microbiology Ecology},
  title        = {Effect of drying and rewetting on bacterial growth rates in soil.},
  url          = {http://dx.doi.org/10.1111/j.1574-6941.2008.00524.x},
  volume       = {65},
  year         = {2008},
}