Thermal sensitivity of soil microbial carbon use efficiency across forest biomes

Chengjie Ren, Zhenghu Zhou (), Manuel Delgado-Baquerizo, Felipe Bastida, Fazhu Zhao, Yuanhe Yang, Shuohong Zhang, Jieying Wang, Chao Zhang, Xinhui Han, Jun Wang, Gaihe Yang () and Gehong Wei ()
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Chengjie Ren: Northwest A&F University
Zhenghu Zhou: Northeast Forestry University
Manuel Delgado-Baquerizo: CSIC
Felipe Bastida: Campus Universitario de Espinardo
Fazhu Zhao: Northwest University
Yuanhe Yang: Chinese Academy of Sciences
Shuohong Zhang: Northwest A&F University
Jieying Wang: Northwest University
Chao Zhang: Northwest A&F University
Xinhui Han: Northwest A&F University
Jun Wang: Northwest University
Gaihe Yang: Northwest A&F University
Gehong Wei: Northwest A&F University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Understanding the large-scale pattern of soil microbial carbon use efficiency (CUE) and its temperature sensitivity (CUET) is critical for understanding soil carbon–climate feedback. We used the 18O-H2O tracer method to quantify CUE and CUET along a north-south forest transect. Climate was the primary factor that affected CUE and CUET, predominantly through direct pathways, then by altering soil properties, carbon fractions, microbial structure and functions. Negative CUET (CUE decreases with measuring temperature) in cold forests (mean annual temperature lower than 10 °C) and positive CUET (CUE increases with measuring temperature) in warm forests (mean annual temperature greater than 10 °C) suggest that microbial CUE optimally operates at their adapted temperature. Overall, the plasticity of microbial CUE and its temperature sensitivity alter the feedback of soil carbon to climate warming; that is, a climate-adaptive microbial community has the capacity to reduce carbon loss from soil matrices under corresponding favorable climate conditions.

Date: 2024
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DOI: 10.1038/s41467-024-50593-6

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