Soil bacterial and fungal response to wildfires in the Canadian boreal forest across a burn severity gradient
Abstract
Global fire regimes are changing, with increases in wildfire frequency and severity expected for many North American forests over the next 100 years. Fires can result in dramatic changes to carbon (C) stocks and can restructure plant and microbial communities, with long-lasting effects on ecosystem functions. We investigated wildfire effects on soil microbial communities (bacteria and fungi) in an extreme fire season in the northwestern Canadian boreal forest, using field surveys, remote sensing, and high-throughput amplicon sequencing in upland and wetland sites. We hypothesized that vegetation community and soil pH would be the most important determinants of microbial community composition, while the effect of fire might not be significant, and found that fire occurrence, along with vegetation community, moisture regime, pH, total carbon, and soil texture are all significant predictors of soil microbial community composition. Burned communities become increasingly dissimilar to unburned communities with increasingly severe burns, and the burn severity index (an index of the fractional area of consumed organic soils and exposed mineral soils) best predicted total bacterial community composition, while whether a site was burned or not was the best predictor for fungi. Globally abundant taxa were identified as significant positive fire responders in this system, includingmore »
- Publication Date:
- Research Org.:
- University of California, Berkeley, CA (United States); Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- Contributing Org.:
- Government of the Northwest Territories; Parks Canada Agency
- OSTI Identifier:
- 1561322
- Alternate Identifier(s):
- OSTI ID: 1572298
- Grant/Contract Number:
- SC0016365
- Resource Type:
- Published Article
- Journal Name:
- Soil Biology and Biochemistry
- Additional Journal Information:
- Journal Name: Soil Biology and Biochemistry Journal Volume: 138 Journal Issue: C; Journal ID: ISSN 0038-0717
- Publisher:
- Elsevier
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; 58 GEOSCIENCES; 54 ENVIRONMENTAL SCIENCES; Wildfire; Burn severity; Boreal; Fungi; Bacteria; Pyrophilic; Fire response
Citation Formats
Whitman, Thea, Whitman, Ellen, Woolet, Jamie, Flannigan, Mike D., Thompson, Dan K., and Parisien, Marc-André. Soil bacterial and fungal response to wildfires in the Canadian boreal forest across a burn severity gradient. United Kingdom: N. p., 2019.
Web. doi:10.1016/j.soilbio.2019.107571.
Whitman, Thea, Whitman, Ellen, Woolet, Jamie, Flannigan, Mike D., Thompson, Dan K., & Parisien, Marc-André. Soil bacterial and fungal response to wildfires in the Canadian boreal forest across a burn severity gradient. United Kingdom. https://doi.org/10.1016/j.soilbio.2019.107571
Whitman, Thea, Whitman, Ellen, Woolet, Jamie, Flannigan, Mike D., Thompson, Dan K., and Parisien, Marc-André. Fri .
"Soil bacterial and fungal response to wildfires in the Canadian boreal forest across a burn severity gradient". United Kingdom. https://doi.org/10.1016/j.soilbio.2019.107571.
@article{osti_1561322,
title = {Soil bacterial and fungal response to wildfires in the Canadian boreal forest across a burn severity gradient},
author = {Whitman, Thea and Whitman, Ellen and Woolet, Jamie and Flannigan, Mike D. and Thompson, Dan K. and Parisien, Marc-André},
abstractNote = {Global fire regimes are changing, with increases in wildfire frequency and severity expected for many North American forests over the next 100 years. Fires can result in dramatic changes to carbon (C) stocks and can restructure plant and microbial communities, with long-lasting effects on ecosystem functions. We investigated wildfire effects on soil microbial communities (bacteria and fungi) in an extreme fire season in the northwestern Canadian boreal forest, using field surveys, remote sensing, and high-throughput amplicon sequencing in upland and wetland sites. We hypothesized that vegetation community and soil pH would be the most important determinants of microbial community composition, while the effect of fire might not be significant, and found that fire occurrence, along with vegetation community, moisture regime, pH, total carbon, and soil texture are all significant predictors of soil microbial community composition. Burned communities become increasingly dissimilar to unburned communities with increasingly severe burns, and the burn severity index (an index of the fractional area of consumed organic soils and exposed mineral soils) best predicted total bacterial community composition, while whether a site was burned or not was the best predictor for fungi. Globally abundant taxa were identified as significant positive fire responders in this system, including the bacteria Massilia sp. (64 × more abundant with fire) and Arthrobacter sp. (35×), and the fungi Penicillium sp. (22×) and Fusicladium sp. (12×). Bacterial and fungal co-occurrence network modules were characterized by fire responsiveness as well as pH and moisture regime. Building on the efforts of previous studies, our results consider a particularly wide range of soils, vegetation, and burn severities, and we identify specific fire-responsive microbial taxa and suggest that accounting for burn severity improves our understanding of microbial response to fires.},
doi = {10.1016/j.soilbio.2019.107571},
journal = {Soil Biology and Biochemistry},
number = C,
volume = 138,
place = {United Kingdom},
year = {Fri Nov 01 00:00:00 EDT 2019},
month = {Fri Nov 01 00:00:00 EDT 2019}
}
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