Journal
ISME JOURNAL
Volume 15, Issue 4, Pages 1207-1221Publisher
SPRINGERNATURE
DOI: 10.1038/s41396-020-00844-3
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Funding
- Swedish Research Council (VR) [330-2014-6430]
- Marie Sklodowska Curie Actions [INCA600398]
- Danish National Research Foundation through Center for Permafrost (CENPERM) [DNRF100]
- U.S. Department of Energy, Office of Science, Office of Biological and Environmental Research, Terrestrial Ecosystem Sciences Program [DE-SC0010562]
- Danish National Research Foundation
- Carlsberg Foundation
- Novo Nordisk Fonden [NNF19OC0057374] Funding Source: researchfish
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Climate change alters frequencies and intensities of soil drying-rewetting and freezing-thawing cycles, impacting soil water availability crucial for microbial activity. Experiments show that drying-rewetting cycles have stronger effects on soil microbial communities and CO2 production than freezing-thawing cycles.
Climate change alters frequencies and intensities of soil drying-rewetting and freezing-thawing cycles. These fluctuations affect soil water availability, a crucial driver of soil microbial activity. While these fluctuations are leaving imprints on soil microbiome structures, the question remains if the legacy of one type of weather fluctuation (e.g., drying-rewetting) affects the community response to the other (e.g., freezing-thawing). As both phenomenons give similar water availability fluctuations, we hypothesized that freezing-thawing and drying-rewetting cycles have similar effects on the soil microbiome. We tested this hypothesis by establishing targeted microcosm experiments. We created a legacy by exposing soil samples to a freezing-thawing or drying-rewetting cycle (phase 1), followed by an additional drying-rewetting or freezing-thawing cycle (phase 2). We measured soil respiration and analyzed soil microbiome structures. Across experiments, larger CO2 pulses and changes in microbiome structures were observed after rewetting than thawing. Drying-rewetting legacy affected the microbiome and CO2 emissions upon the following freezing-thawing cycle. Conversely, freezing-thawing legacy did not affect the microbial response to the drying-rewetting cycle. Our results suggest that drying-rewetting cycles have stronger effects on soil microbial communities and CO2 production than freezing-thawing cycles and that this pattern is mediated by sustained changes in soil microbiome structures.
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