Effects of warming on bacterial growth rates in a peat soil under ambient and elevated CO2
Abstract
Boreal peatlands are important global carbon reservoirs that are particularly vulnerable to predicted climate changes such as increasing CO2 and temperature. Since microbial activities regulate the balance of carbon sequestered into soil organic matter or remineralized to CO2, characterizing their response to these environmental factors is critical to predicting how peatland ecosystems will affect climate-carbon cycle feedbacks. Here we examined in-situ taxon-specific variation in microbial growth under long-term elevated CO2 and across a gradient of warming treatments in a northern Minnesota peat bog using quantitative stable isotope probing with 18O-water. Across temperatures, bacterial taxa were grouped according to the excess atom fraction 18O (EAF) of their genomes, a proxy for DNA replication and hence, growth. Taxon-specific growth across CO2 and temperature treatments clustered into relatively few response patterns. While a large portion of taxa showed little to no growth under ambient CO2, many of the same taxa grew rapidly under elevated CO2. We found support for phylogenetic conservation of response patterns among Acidobacteria and Proteobacteria, the two most abundant phyla in our data. Our results suggest certain taxa may be primed for new climate conditions and have a greater influence on carbon cycling with implications for future climate mitigation strategies.
- Authors:
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[1];
[1];
[1];
[1];
[1];
[1];
[2];
[2];
[2];
[2];
[3]
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Northern Arizona Univ., Flagstaff, AZ (United States)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Iowa State Univ., Ames, IA (United States)
- Publication Date:
- Research Org.:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1909596
- Alternate Identifier(s):
- OSTI ID: 1960958
- Report Number(s):
- PNNL-SA-166721
Journal ID: ISSN 0038-0717
- Grant/Contract Number:
- AC05-76RL01830; AC05-00OR22725; FWP 68907; FWP 74475; SC0020172; SC0016207; AC05- 00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Soil Biology and Biochemistry
- Additional Journal Information:
- Journal Volume: 178; Journal ID: ISSN 0038-0717
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; 16S amplicon sequencing, Carbon Dioxide (CO2), peatlands, warming, microbial ecology, microbial growth, 18O labeling
Citation Formats
Bell, Sheryl L., Zimmerman, Amy E., Stone, Bram W. G, Chang, Christine H., Blumer, Madison R., Renslow, Ryan S., Propster, Jeffrey R., Hayer, Michaela, Schwartz, Egbert, Hungate, Bruce A., and Hofmockel, Kirsten S. Effects of warming on bacterial growth rates in a peat soil under ambient and elevated CO2. United States: N. p., 2022.
Web. doi:10.1016/j.soilbio.2022.108933.
Bell, Sheryl L., Zimmerman, Amy E., Stone, Bram W. G, Chang, Christine H., Blumer, Madison R., Renslow, Ryan S., Propster, Jeffrey R., Hayer, Michaela, Schwartz, Egbert, Hungate, Bruce A., & Hofmockel, Kirsten S. Effects of warming on bacterial growth rates in a peat soil under ambient and elevated CO2. United States. https://doi.org/10.1016/j.soilbio.2022.108933
Bell, Sheryl L., Zimmerman, Amy E., Stone, Bram W. G, Chang, Christine H., Blumer, Madison R., Renslow, Ryan S., Propster, Jeffrey R., Hayer, Michaela, Schwartz, Egbert, Hungate, Bruce A., and Hofmockel, Kirsten S. Sat .
"Effects of warming on bacterial growth rates in a peat soil under ambient and elevated CO2". United States. https://doi.org/10.1016/j.soilbio.2022.108933. https://www.osti.gov/servlets/purl/1909596.
@article{osti_1909596,
title = {Effects of warming on bacterial growth rates in a peat soil under ambient and elevated CO2},
author = {Bell, Sheryl L. and Zimmerman, Amy E. and Stone, Bram W. G and Chang, Christine H. and Blumer, Madison R. and Renslow, Ryan S. and Propster, Jeffrey R. and Hayer, Michaela and Schwartz, Egbert and Hungate, Bruce A. and Hofmockel, Kirsten S.},
abstractNote = {Boreal peatlands are important global carbon reservoirs that are particularly vulnerable to predicted climate changes such as increasing CO2 and temperature. Since microbial activities regulate the balance of carbon sequestered into soil organic matter or remineralized to CO2, characterizing their response to these environmental factors is critical to predicting how peatland ecosystems will affect climate-carbon cycle feedbacks. Here we examined in-situ taxon-specific variation in microbial growth under long-term elevated CO2 and across a gradient of warming treatments in a northern Minnesota peat bog using quantitative stable isotope probing with 18O-water. Across temperatures, bacterial taxa were grouped according to the excess atom fraction 18O (EAF) of their genomes, a proxy for DNA replication and hence, growth. Taxon-specific growth across CO2 and temperature treatments clustered into relatively few response patterns. While a large portion of taxa showed little to no growth under ambient CO2, many of the same taxa grew rapidly under elevated CO2. We found support for phylogenetic conservation of response patterns among Acidobacteria and Proteobacteria, the two most abundant phyla in our data. Our results suggest certain taxa may be primed for new climate conditions and have a greater influence on carbon cycling with implications for future climate mitigation strategies.},
doi = {10.1016/j.soilbio.2022.108933},
journal = {Soil Biology and Biochemistry},
number = ,
volume = 178,
place = {United States},
year = {Sat Dec 24 00:00:00 EST 2022},
month = {Sat Dec 24 00:00:00 EST 2022}
}
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