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

文献类型： 外文期刊

作者： Yu, Kailiang 1 ; He, Lei 3 ; Niu, Shuli 1 ; Wang, Jinsong 1 ; Garcia-palacios, Pablo 1 ; Dacal, Marina 4 ; Averill, Colin 6 ; Georgiou, Katerina 7 ; Ye, Jian-sheng 8 ; Mo, Fei 9 ; Yang, Lu 10 ; Crowther, Thomas W. 6 ;

作者机构： 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China

2.Princeton Univ, High Meadows Environm Inst, Princeton, NJ 08544 USA

3.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, State Key Lab Efficient Utilizat Arable Land China, Beijing, Peoples R China; CSIC, Inst Ciencias Agr, Madrid, Spain

4.Univ Alicante, Inst Multidisciplinar Estudio Medio Ramon Margalef, Alicante, Spain

5.Neurobiol Freie Univ Berlin, Inst Biol, D-14195 Berlin, Germany

6.Swiss Fed Inst Technol, Dept Environm Syst Sci, CH-8092 Zurich, Switzerland

7.Lawrence Livermore Natl Lab, Phys & Life Sci Directorate, Livermore, CA USA

8.Lanzhou Univ, Coll Ecol, State Key Lab Grassland Agroecosyst, Lanzhou, Peoples R China

9.Northwest A&F Univ, Coll Agron, Yangling, Peoples R China

10.Beijing Forestry Univ, Res Ctr Forest Management Engn State Forestry & Gr, Beijing, Peoples R China

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

页码：

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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