Elevated temperature and CO2 strongly affect the growth strategies of soil bacteria

Yang Ruan, Yakov Kuzyakov, Xiaoyu Liu, Xuhui Zhang, Qicheng Xu, Junjie Guo, Shiwei Guo, Qirong Shen, Yunfeng Yang and Ning Ling ()
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Yang Ruan: Lanzhou University
Yakov Kuzyakov: University of Goettingen
Xiaoyu Liu: Nanjing Agricultural University
Xuhui Zhang: Nanjing Agricultural University
Qicheng Xu: Nanjing Agricultural University
Junjie Guo: Nanjing Agricultural University
Shiwei Guo: Nanjing Agricultural University
Qirong Shen: Nanjing Agricultural University
Yunfeng Yang: Tsinghua University
Ning Ling: Lanzhou University

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract The trait-based strategies of microorganisms appear to be phylogenetically conserved, but acclimation to climate change may complicate the scenario. To study the roles of phylogeny and environment on bacterial responses to sudden moisture increases, we determine bacterial population-specific growth rates by 18O-DNA quantitative stable isotope probing (18O-qSIP) in soils subjected to a free-air CO2 enrichment (FACE) combined with warming. We find that three growth strategies of bacterial taxa – rapid, intermediate and slow responders, defined by the timing of the peak growth rates – are phylogenetically conserved, even at the sub-phylum level. For example, members of class Bacilli and Sphingobacteriia are mainly rapid responders. Climate regimes, however, modify the growth strategies of over 90% of species, partly confounding the initial phylogenetic pattern. The growth of rapid bacterial responders is more influenced by phylogeny, whereas the variance for slow responders is primarily explained by environmental conditions. Overall, these results highlight the role of phylogenetic and environmental constraints in understanding and predicting the growth strategies of soil microorganisms under global change scenarios.

Date: 2023
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DOI: 10.1038/s41467-023-36086-y

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