Soil microbial legacies differ following drying-rewetting and freezing-thawing cycles

被引：0
作者：
Annelein Meisner
Basten L. Snoek
Joseph Nesme
Elizabeth Dent
Samuel Jacquiod
Aimée T. Classen
Anders Priemé
机构：
[1] Lund University,Microbial Ecology, Department of Biology
[2] University of Copenhagen,Department of Biology
[3] Netherlands Institute of Ecology,Department of Microbial Ecology
[4] Utrecht University,Theoretical Biology and Bioinformatics
[5] INRAE Centre Dijon,Agroécologie, AgroSup Dijon
[6] Université de Bourgogne Franche-Comté,Ecology and Evolutionary Biology Department
[7] University of Michigan,The Center for Macroecology, Evolution and Climate
[8] The Gund Institute for Environment,Department of Geosciences and Natural Resource Management
[9] University of Vermont,undefined
[10] The University of Copenhagen,undefined
[11] Center for Permafrost (CENPERM),undefined
[12] University of Copenhagen,undefined
[13] Wageningen University & Research,undefined
来源：
The ISME Journal | 2021年 / 15卷
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摘要：
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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页码：1207 / 1221
页数：14
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