分类单元
生态学
生物
全球变暖
环境科学
气候变化
作者
Dennis Metze,Jörg Schnecker,Coline Le Noir de Carlan,Biplabi Bhattarai,Erik Verbruggen,Ivika Ostonen,Ivan A. Janssens,Bjarni D. Sigurðsson,Bela Hausmann,Christina Kaiser,Andreas Richter
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2024-02-23
卷期号:10 (8)
标识
DOI:10.1126/sciadv.adk6295
摘要
Soil microorganisms control the fate of soil organic carbon. Warming may accelerate their activities putting large carbon stocks at risk of decomposition. Existing knowledge about microbial responses to warming is based on community-level measurements, leaving the underlying mechanisms unexplored and hindering predictions. In a long-term soil warming experiment in a Subarctic grassland, we investigated how active populations of bacteria and archaea responded to elevated soil temperatures (+6°C) and the influence of plant roots, by measuring taxon-specific growth rates using quantitative stable isotope probing and 18O water vapor equilibration. Contrary to prior assumptions, increased community growth was associated with a greater number of active bacterial taxa rather than generally faster-growing populations. We also found that root presence enhanced bacterial growth at ambient temperatures but not at elevated temperatures, indicating a shift in plant-microbe interactions. Our results, thus, reveal a mechanism of how soil bacteria respond to warming that cannot be inferred from community-level measurements.
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