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Warming effects on grassland soil microbial communities are amplified in cool months
编号：143 访问权限：仅限参会人 更新：2024-04-10 19:39:01 浏览：123次 口头报告

报告开始：2024年04月13日 20:24（Asia/Shanghai）

报告时间：6min

所在会场：[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.
关键词
Soil respiration,Microbial functional traits,Seasonal succession,Global warming,Carbon decomposition
报告人
雷杰斯
博士生 清华大学

稿件作者
雷杰斯 清华大学
SuYuanlong Tsinghua University
JianSiyang University of Oklahoma
郭雪 中国科学院生态环境研究中心
YuanMengting University of California Berkeley
BatesColin University of Oklahoma
ShiZhou Genetech Inc.
LiJiabal CAS；CIB
SuYifan Tsinghua University
NingDaliang University of Oklahoma
WuLiyou University of Oklahoma
ZhouJizhong University of Oklahoma
杨云锋 Tsinghua University；School of Environment
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重要日期

  • 会议日期

    04月12日

    2024

    至

    04月14日

    2024

  • 03月28日 2024

    初稿截稿日期

  • 04月14日 2024

    注册截止日期

主办单位
华中农业大学
中国微生物学会地质微生物学专业委员会
承办单位
华中农业大学资源与环境学院
土壤环境与污染修复湖北省重点实验室
农业微生物资源发掘与利用全国重点实验室
中国地质大学（武汉）
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