Abstract
The magnitude of the feedback between soil microbial respiration and increased mean temperature may decrease (a process called thermal adaptation) or increase over time, and accurately representing this feedback in models improves predictions of soil carbon loss rates. However, climate change entails changes not only in mean temperature but also in temperature fluctuation, and how this fluctuation regulates the thermal response of microbial respiration has never been systematically evaluated. By analysing subtropical forest soils from a 2,000 km transect across China, we showed that although a positive relationship between soil microbial biomass-specific respiration and temperature was observed under increased constant incubation temperature, an increasing temperature fluctuation had a stronger negative effect. Our results further indicated that changes in bacterial community composition and reduced activities of carbon degradation enzymes promoted the effect of temperature fluctuation. This adaptive response of soil microbial respiration suggests that climate warming may have a lesser exacerbating effect on atmospheric CO2 concentrations than predicted.
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Data availability
The sequence data generated in the present study have been deposited in the NCBI GenBank Short Read Archive under accession number PRJNA809849. All data supporting the findings of the statistical analyses are publicly available at https://doi.org/10.5281/zenodo.6153431.
Code availability
All the R code for our statistical analyses is publicly available at https://doi.org/10.5281/zenodo.6153431.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (grant nos 31930070, 92251305 and 91951112), the Program of Shanghai Academic/Technology Research Leader (grant no. 21XD1420700), the ‘Shuguang Program’ supported by the Shanghai Education Development Foundation and the Shanghai Municipal Education Commission (grant no. 21SG02), and the Shanghai Pilot Program for Basic Research—Fudan University 21TQ1400100 (grant no. 21TQ004).
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M.N. developed the original ideas presented in the manuscript. Y.Z. completed the experiments with assistance from M.N., J.-Q.L., J.-T.L., C.L., C.-M.F. and X.X. Y.Z. performed the overall analysis with assistance from X.-N.X., H.-Y.C., T.Z., J.-J.X., M.N. and B.L. Y.Z. and M.N. wrote the first draft, and all authors jointly revised the manuscript.
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Zhang, Y., Li, JT., Xu, X. et al. Temperature fluctuation promotes the thermal adaptation of soil microbial respiration. Nat Ecol Evol 7, 205–213 (2023). https://doi.org/10.1038/s41559-022-01944-3
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DOI: https://doi.org/10.1038/s41559-022-01944-3