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Minor effects of nutrient additions on soil microbial carbon use efficiency


Abstract

The carbon use efficiency (CUE) of soil microbes is defined as the proportion of assimilated carbon (C) allocated to microbial growth than lost through respiration. CUE is a critical parameter in soil C cycling, and its response to external nutrient inputs (including nitrogen [N], phosphorus [P], and combined NP) could determine the change of soil C pool. However, the general pattern of CUE response to nutrient addition remains unclear. By conducting a global meta-analysis of 427 observations, we found that the nutrient addition had no significant overall effect on CUE, whether in the overall nutrient addition experiments or in experiments with different types of nutrient addition. The response of CUE to N addition was regulated by duration, with long-term addition (>10 year) leading to a decrease in CUE. We identified the aridity index as the most important predictor influencing CUE in response to N addition, while ecosystem type was the most key variable for CUE response to both P and NP additions. Global predictions showed future N inputs tends to enhance CUE across most regions, especially in cropland ecosystems. Overall, the effect of nutrient addition on CUE was relatively minor, providing key microbial evidence for understanding future soil C dynamics.

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Data availability

The data that support the findings of this study are openly available in figshare at https://doi.org/10.6084/m9.figshare.30702806.

Code availability

The code that support the findings of this study are openly available in figshare at https://doi.org/10.6084/m9.figshare.30702806.

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Acknowledgements

The authors thank the Subject editor and three anonymous reviewers for their insightful comments and suggestions. We sincerely thank all the scientists whose data were included in this meta-analysis. This study was financially supported by the National Natural Science Foundation of China (32301426 and 32571907), the China Postdoctoral Science Foundation (2022M720252 and 2024T170025).

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Y.C. and Y.L. conceived the idea; Y.C. and Y.L. collected the data with the help from S.G.; Y.C., Y.L., and H.L. analyzed the data; Y.C. and Y.L. wrote the manuscript with input from all authors.

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Ying Chen.

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Communications Earth and Environment thanks Marcio F. A. Leite and the other, anonymous, reviewer(s) for their contribution to the peer review of this work. Primary Handling Editors: Yi Jiao, Somaparna Ghosh A peer review file is available.

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Chen, Y., Lu, Y., Gao, S. et al. Minor effects of nutrient additions on soil microbial carbon use efficiency.
Commun Earth Environ (2025). https://doi.org/10.1038/s43247-025-03096-1

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