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Warming effects on grassland soil microbial communities are amplified in cool months
编号：143
稿件编号：170 访问权限：仅限参会人
更新：2024-04-10 19:39:01 浏览：276次
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报告开始：2024年04月13日 20:24 （Asia/Shanghai）
报告时间：6min
所在会议：[研究生] 研究生专场 » [3] 研究生专场三
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摘要
Global warming could modulate soil respiration (RS) via microbial decomposition, which is seasonally dependent. Yet, the magnitude and direction of this modulation remain unclear, partly owing to the lack of knowledge on how microorganisms respond to seasonal changes. Here, we investigated the temporal dynamics of soil microbial communities over 12 consecutive months under experimental warming in a tallgrass prairie ecosystem. The interplay between warming and time altered (p < 0.05) the taxonomic and functional compositions of microbial communities. During the cool months (January to February and October to December), warming induced a soil microbiome with a higher genomic potential for carbon decomposition, community-level ribosomal RNA operon (rrn) copy numbers, and microbial metabolic quotients, suggesting that warming stimulated fast-growing microorganisms that enhanced carbon decomposition. Modeling analyses further showed that warming reduced the temperature sensitivity of microbial carbon use efficiency (CUE) by 28.7% when monthly average temperature was low, resulting in lower microbial CUE and higher heterotrophic respiration (Rh) potentials. Structural equation modeling showed that warming modulated Rh and RS directly by altering soil temperature and indirectly by influencing microbial community traits, soil moisture, nitrate content, soil pH, and gross primary productivity. The modulation of Rh by warming was more pronounced in cooler months compared to warmer ones. Together, our findings reveal distinct warming-induced effects on microbial functional traits in cool months, challenging common practice in climate change studies to collect soil samples only in the peak growing season, and advancing our mechanistic understanding of the seasonal pattern of RS/Rh sensitivity to warming.
关键字
Soil respiration,Microbial functional traits,Seasonal succession,Global warming,Carbon decomposition
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