Experimental warming accelerates positive soil priming in a temperate grassland ecosystem

作者：Xuanyu Tao, Zhifeng Yang, Jiajie Feng, Siyang Jian, Yunfeng Yang, Colin T. Bates, Gangsheng Wang, Xue Guo, Daliang Ning, Megan L. Kempher, Xiao‐Jun Allen 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, Jizhong Zhou · 发表于：Nature Communications · 年份：2024 · DOI：10.1038/s41467-024-45277-0 · 被引用次数：76 · 研究领域：Microbial Community Ecology and Physiology、Soil Carbon and Nitrogen Dynamics、Ecosystem dynamics and resilience

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 CO 2 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.