Nonlinear microbial thermal response and its implications for abrupt soil organic carbon responses to warming

文献类型： 外文期刊

第一作者： Yu, Kailiang

作者： Yu, Kailiang;Niu, Shuli;Wang, Jinsong;Yu, Kailiang;He, Lei;Dacal, Marina;Dacal, Marina;Averill, Colin;Crowther, Thomas W.;Georgiou, Katerina;Ye, Jian-sheng;Mo, Fei;Yang, Lu

作者机构：

期刊名称：NATURE COMMUNICATIONS （ 影响因子：15.7； 五年影响因子：17.2 ）

ISSN：

年卷期： 2025 年 16 卷 1 期

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收录情况： SCI

摘要： Microbial carbon use efficiency (CUE) is a key microbial trait affecting soil organic carbon (SOC) dynamics. However, we lack a unified and predictive understanding of the mechanisms underpinning the temperature response of microbial CUE, and, thus, its impacts on SOC storage in a warming world. Here, we leverage three independent soil datasets (n = 618 for microbial CUE; n = 591 and 660 for heterotrophic respiration) at broad spatial scales to investigate the microbial thermal response and its implications for SOC responses to warming. We show a nonlinear increase and decrease of CUE and heterotrophic respiration, respectively, in response to mean annual temperature (MAT), with a thermal threshold at approximate to 15 degrees C. These nonlinear relationships are mainly associated with changes in the fungal-to-bacterial biomass ratio. Our microbial-explicit SOC model predicts significant SOC losses at MAT above approximate to 15 degrees C due to increased CUE, total microbial biomass, and heterotrophic respiration, implying a potential abrupt transition to more vulnerable SOC under climate warming.

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