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Title: Drought impacts on microbial trait distribution and feedback to soil carbon cycling

Abstract

Abstract Quantifying the impact of drought on microbial processes and its consequences for soil carbon cycling is hindered by the lack of underlying mechanistic understanding. Therefore, there is a need to scale up the physiological response to changing water status from individual soil microbes to collective communities across different ecosystems. Here we propose the use of a framework that incorporates trait‐based ecology to link drought‐impacted microbial processes to rates of soil carbon decomposition and stabilisation. We briefly synthesise existing knowledge on the effects of drought on microbial physiology at the individual to community scale, before integrating this understanding within a framework incorporating life‐history strategy, ecological strategy and biochemistry. This framework highlights a dynamic allocation to high yield (Y), resource acquisition (A) and stress tolerance (S) pathways as environmental conditions change. Y‐A‐S strategies represent sets of traits that tend to correlate due to physiological or evolutionary trade‐offs. This framework enables assessment of microbial processes along two key environmental gradients of water and resource availability, both of which are constrained by drought. The variable chemistry of biomass and necromass produced under different physiological strategies in response to drying–rewetting impacts organic matter decomposition and stabilisation in soils, and should also be considered whenmore » quantifying soil carbon balance. We highlight that diversion of resources away from microbial growth can alter soil organic matter chemistry and its persistence depending on the kind of microbial compounds produced. To advance such a framework, we highlight avenues of research that would enable the further identification and quantification of traits linked to Y‐A‐S strategies and the physiological outcomes at the community level under drought and rewetting, and conclude by hypothesising how ecosystem‐level changes might feedback on to the soil carbon cycle. A scalable understanding of microbial drought‐response mechanisms affecting soil carbon cycling will transform the way microbial physiology is represented in ecosystem studies. Read the free Plain Language Summary for this article on the Journal blog.« less

Authors:
ORCiD logo [1];  [2]
  1. School of Biological Sciences University of Aberdeen Aberdeen UK
  2. Climate and Ecosystem Sciences Division Lawrence Berkeley National Laboratory Berkeley California USA
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1871355
Alternate Identifier(s):
OSTI ID: 1855202; OSTI ID: 1996437
Grant/Contract Number:  
Early Career Research Program #FP00005182; DE‐SC0020382; AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Functional Ecology
Additional Journal Information:
Journal Name: Functional Ecology Journal Volume: 36 Journal Issue: 6; Journal ID: ISSN 0269-8463
Publisher:
Wiley-Blackwell
Country of Publication:
United Kingdom
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; drought; drying–rewetting; microbial traits; soil carbon; water stress

Citation Formats

Malik, Ashish A., and Bouskill, Nicholas J. Drought impacts on microbial trait distribution and feedback to soil carbon cycling. United Kingdom: N. p., 2022. Web. doi:10.1111/1365-2435.14010.
Malik, Ashish A., & Bouskill, Nicholas J. Drought impacts on microbial trait distribution and feedback to soil carbon cycling. United Kingdom. https://doi.org/10.1111/1365-2435.14010
Malik, Ashish A., and Bouskill, Nicholas J. Sun . "Drought impacts on microbial trait distribution and feedback to soil carbon cycling". United Kingdom. https://doi.org/10.1111/1365-2435.14010.
@article{osti_1871355,
title = {Drought impacts on microbial trait distribution and feedback to soil carbon cycling},
author = {Malik, Ashish A. and Bouskill, Nicholas J.},
abstractNote = {Abstract Quantifying the impact of drought on microbial processes and its consequences for soil carbon cycling is hindered by the lack of underlying mechanistic understanding. Therefore, there is a need to scale up the physiological response to changing water status from individual soil microbes to collective communities across different ecosystems. Here we propose the use of a framework that incorporates trait‐based ecology to link drought‐impacted microbial processes to rates of soil carbon decomposition and stabilisation. We briefly synthesise existing knowledge on the effects of drought on microbial physiology at the individual to community scale, before integrating this understanding within a framework incorporating life‐history strategy, ecological strategy and biochemistry. This framework highlights a dynamic allocation to high yield (Y), resource acquisition (A) and stress tolerance (S) pathways as environmental conditions change. Y‐A‐S strategies represent sets of traits that tend to correlate due to physiological or evolutionary trade‐offs. This framework enables assessment of microbial processes along two key environmental gradients of water and resource availability, both of which are constrained by drought. The variable chemistry of biomass and necromass produced under different physiological strategies in response to drying–rewetting impacts organic matter decomposition and stabilisation in soils, and should also be considered when quantifying soil carbon balance. We highlight that diversion of resources away from microbial growth can alter soil organic matter chemistry and its persistence depending on the kind of microbial compounds produced. To advance such a framework, we highlight avenues of research that would enable the further identification and quantification of traits linked to Y‐A‐S strategies and the physiological outcomes at the community level under drought and rewetting, and conclude by hypothesising how ecosystem‐level changes might feedback on to the soil carbon cycle. A scalable understanding of microbial drought‐response mechanisms affecting soil carbon cycling will transform the way microbial physiology is represented in ecosystem studies. Read the free Plain Language Summary for this article on the Journal blog.},
doi = {10.1111/1365-2435.14010},
journal = {Functional Ecology},
number = 6,
volume = 36,
place = {United Kingdom},
year = {Sun Feb 06 00:00:00 EST 2022},
month = {Sun Feb 06 00:00:00 EST 2022}
}

Journal Article:
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Publisher's Version of Record
https://doi.org/10.1111/1365-2435.14010

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