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Can moisture affect temperature dependences of microbial growth and respiration?

Cruz-Paredes, Carla LU orcid ; Tájmel, Dániel LU and Rousk, Johannes LU (2021) In Soil Biology and Biochemistry 156.
Abstract

It is of great importance to understand how terrestrial ecosystems will respond to global changes. However, most experimental approaches have focused on single factors. In natural systems, moisture and temperature often change simultaneously, and they can interact and shape microbial responses. Even though soil moisture and temperature are very important factors controlling microbial activity, there is disagreement on the dependence of microbial rates on temperature and moisture as well as their sensitivity when both variables change simultaneously. Here we created a moisture gradient and determined high resolution intrinsic temperature dependences for bacterial and fungal growth rates as well as respiration rates. We found that... (More)

It is of great importance to understand how terrestrial ecosystems will respond to global changes. However, most experimental approaches have focused on single factors. In natural systems, moisture and temperature often change simultaneously, and they can interact and shape microbial responses. Even though soil moisture and temperature are very important factors controlling microbial activity, there is disagreement on the dependence of microbial rates on temperature and moisture as well as their sensitivity when both variables change simultaneously. Here we created a moisture gradient and determined high resolution intrinsic temperature dependences for bacterial and fungal growth rates as well as respiration rates. We found that microbial rates decreased with lower moisture and increased with higher temperatures until optimum values. Additionally, we found independence between temperature and moisture as rate modifiers. We also found that temperature sensitivities (Q10) for microbial growth and respiration were not affected by changes in moisture. This provided an experimental framework to validate assumptions of temperature and moisture rate modifiers used in ecosystem and global cycling models (GCMs).

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Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Microbial growth, Moisture, Soil respiration, Temperature dependence
in
Soil Biology and Biochemistry
volume
156
article number
108223
publisher
Elsevier
external identifiers
  • scopus:85103317572
ISSN
0038-0717
DOI
10.1016/j.soilbio.2021.108223
project
Microbial temperature dependence in soil: the feed-back to climate warming
language
English
LU publication?
yes
id
7868b540-500b-43ad-a615-39952c572441
date added to LUP
2021-04-07 07:29:37
date last changed
2024-05-04 05:17:29
@article{7868b540-500b-43ad-a615-39952c572441,
  abstract     = {{<p>It is of great importance to understand how terrestrial ecosystems will respond to global changes. However, most experimental approaches have focused on single factors. In natural systems, moisture and temperature often change simultaneously, and they can interact and shape microbial responses. Even though soil moisture and temperature are very important factors controlling microbial activity, there is disagreement on the dependence of microbial rates on temperature and moisture as well as their sensitivity when both variables change simultaneously. Here we created a moisture gradient and determined high resolution intrinsic temperature dependences for bacterial and fungal growth rates as well as respiration rates. We found that microbial rates decreased with lower moisture and increased with higher temperatures until optimum values. Additionally, we found independence between temperature and moisture as rate modifiers. We also found that temperature sensitivities (Q<sub>10</sub>) for microbial growth and respiration were not affected by changes in moisture. This provided an experimental framework to validate assumptions of temperature and moisture rate modifiers used in ecosystem and global cycling models (GCMs).</p>}},
  author       = {{Cruz-Paredes, Carla and Tájmel, Dániel and Rousk, Johannes}},
  issn         = {{0038-0717}},
  keywords     = {{Microbial growth; Moisture; Soil respiration; Temperature dependence}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Soil Biology and Biochemistry}},
  title        = {{Can moisture affect temperature dependences of microbial growth and respiration?}},
  url          = {{http://dx.doi.org/10.1016/j.soilbio.2021.108223}},
  doi          = {{10.1016/j.soilbio.2021.108223}},
  volume       = {{156}},
  year         = {{2021}},
}