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Partial drying accelerates bacterial growth recovery to rewetting

Meisner, Annelein LU ; Leizeaga, Ainara LU ; Rousk, Johannes LU and Bååth, Erland LU (2017) In Soil Biology and Biochemistry 112. p.269-276
Abstract

Fluctuations in soil moisture create drying-rewetting events affecting the activity of microorganisms. Microbial responses to drying-rewetting are mostly studied in soils that are air-dried before rewetting. Upon rewetting, two patterns of bacterial growth have been observed. In the Type 1 pattern, bacterial growth rates increase immediately in a linear fashion. In the Type 2 pattern, bacterial growth rates increase exponentially after a lag period. However, soils are often only partially dried. Partial drying (higher remaining moisture content before rewetting) may be considered a less harsh treatment compared with air-drying. We hypothesized that a soil with a Type 2 response upon rewetting air-dried soil would transform into a Type 1... (More)

Fluctuations in soil moisture create drying-rewetting events affecting the activity of microorganisms. Microbial responses to drying-rewetting are mostly studied in soils that are air-dried before rewetting. Upon rewetting, two patterns of bacterial growth have been observed. In the Type 1 pattern, bacterial growth rates increase immediately in a linear fashion. In the Type 2 pattern, bacterial growth rates increase exponentially after a lag period. However, soils are often only partially dried. Partial drying (higher remaining moisture content before rewetting) may be considered a less harsh treatment compared with air-drying. We hypothesized that a soil with a Type 2 response upon rewetting air-dried soil would transform into a Type 1 response if dried partially before rewetting. Two soils were dried to a gradient of different moisture content. Respiration and bacterial growth rates were then measured before and during 48 h after rewetting to 50% of water holding capacity (WHC). Initial moisture content determined growth and respiration in a sigmoidal fashion, with lowest activity in air-dried soil and maximum above ca. 30% WHC. Partial drying resulted in shorter lag periods, shorter recovery times and lower maximum bacterial growth rates after rewetting. The respiration after rewetting was lower when soil was partially dried and higher when soils were air-dried. The threshold moisture content where transition from a Type 2 to a Type 1 response occurred was about 14% WHC, while >30% WHC resulted in no rewetting effect. We combine our result with other recent reports to propose a framework of response patterns after drying-rewetting, where the harshness of drying determines the response pattern of bacteria upon rewetting dried soils.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Bacterial growth, Birch effect, Climate change, Drought, Drying-rewetting, Respiration
in
Soil Biology and Biochemistry
volume
112
pages
8 pages
publisher
Elsevier
external identifiers
  • scopus:85019712064
  • wos:000404704100025
ISSN
0038-0717
DOI
10.1016/j.soilbio.2017.05.016
language
English
LU publication?
yes
id
e4e8e992-01ca-41c6-8506-dca0a92556ac
date added to LUP
2017-06-08 10:17:12
date last changed
2018-01-07 12:06:35
@article{e4e8e992-01ca-41c6-8506-dca0a92556ac,
  abstract     = {<p>Fluctuations in soil moisture create drying-rewetting events affecting the activity of microorganisms. Microbial responses to drying-rewetting are mostly studied in soils that are air-dried before rewetting. Upon rewetting, two patterns of bacterial growth have been observed. In the Type 1 pattern, bacterial growth rates increase immediately in a linear fashion. In the Type 2 pattern, bacterial growth rates increase exponentially after a lag period. However, soils are often only partially dried. Partial drying (higher remaining moisture content before rewetting) may be considered a less harsh treatment compared with air-drying. We hypothesized that a soil with a Type 2 response upon rewetting air-dried soil would transform into a Type 1 response if dried partially before rewetting. Two soils were dried to a gradient of different moisture content. Respiration and bacterial growth rates were then measured before and during 48 h after rewetting to 50% of water holding capacity (WHC). Initial moisture content determined growth and respiration in a sigmoidal fashion, with lowest activity in air-dried soil and maximum above ca. 30% WHC. Partial drying resulted in shorter lag periods, shorter recovery times and lower maximum bacterial growth rates after rewetting. The respiration after rewetting was lower when soil was partially dried and higher when soils were air-dried. The threshold moisture content where transition from a Type 2 to a Type 1 response occurred was about 14% WHC, while &gt;30% WHC resulted in no rewetting effect. We combine our result with other recent reports to propose a framework of response patterns after drying-rewetting, where the harshness of drying determines the response pattern of bacteria upon rewetting dried soils.</p>},
  author       = {Meisner, Annelein and Leizeaga, Ainara and Rousk, Johannes and Bååth, Erland},
  issn         = {0038-0717},
  keyword      = {Bacterial growth,Birch effect,Climate change,Drought,Drying-rewetting,Respiration},
  language     = {eng},
  month        = {09},
  pages        = {269--276},
  publisher    = {Elsevier},
  series       = {Soil Biology and Biochemistry},
  title        = {Partial drying accelerates bacterial growth recovery to rewetting},
  url          = {http://dx.doi.org/10.1016/j.soilbio.2017.05.016},
  volume       = {112},
  year         = {2017},
}