Experimental warming accelerates positive soil priming in a temperate grassland ecosystem

Xuanyu Tao, Zhifeng Yang, Jiajie Feng, Siyang Jian, Yunfeng Yang (), Colin T. Bates, Gangsheng Wang, Xue Guo, Daliang Ning, Megan L. Kempher, Xiao Jun A. Liu, Yang Ouyang, Shun Han, Linwei Wu, Yufei Zeng, Jialiang Kuang, Ya Zhang, Xishu Zhou, Zheng Shi, Wei Qin, Jianjun Wang, Mary K. Firestone, James M. Tiedje and Jizhong Zhou ()
Additional contact information
Xuanyu Tao: University of Oklahoma
Zhifeng Yang: University of Oklahoma
Jiajie Feng: University of Oklahoma
Siyang Jian: University of Oklahoma
Yunfeng Yang: Tsinghua University
Colin T. Bates: University of Oklahoma
Gangsheng Wang: Wuhan University
Xue Guo: University of Oklahoma
Daliang Ning: University of Oklahoma
Megan L. Kempher: University of Oklahoma
Xiao Jun A. Liu: University of Oklahoma
Yang Ouyang: University of Oklahoma
Shun Han: University of Oklahoma
Linwei Wu: University of Oklahoma
Yufei Zeng: Tsinghua University
Jialiang Kuang: University of Oklahoma
Ya Zhang: University of Oklahoma
Xishu Zhou: University of Oklahoma
Zheng Shi: University of Oklahoma
Wei Qin: University of Oklahoma
Jianjun Wang: Chinese Academic of Sciences
Mary K. Firestone: University of California, Berkeley, Berkeley
James M. Tiedje: Michigan State University
Jizhong Zhou: University of Oklahoma

Nature Communications, 2024, vol. 15, issue 1, 1-18

Abstract: Abstract Unravelling biosphere feedback mechanisms is crucial for predicting the impacts of global warming. Soil priming, an effect of fresh plant-derived carbon (C) on native soil organic carbon (SOC) decomposition, is a key feedback mechanism that could release large amounts of soil C into the atmosphere. However, the impacts of climate warming on soil priming remain elusive. Here, we show that experimental warming accelerates soil priming by 12.7% in a temperate grassland. Warming alters bacterial communities, with 38% of unique active phylotypes detected under warming. The functional genes essential for soil C decomposition are also stimulated, which could be linked to priming effects. We incorporate lab-derived information into an ecosystem model showing that model parameter uncertainty can be reduced by 32–37%. Model simulations from 2010 to 2016 indicate an increase in soil C decomposition under warming, with a 9.1% rise in priming-induced CO2 emissions. If our findings can be generalized to other ecosystems over an extended period of time, soil priming could play an important role in terrestrial C cycle feedbacks and climate change.

Date: 2024
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DOI: 10.1038/s41467-024-45277-0

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