[口头报告]微生物相互作用驱动土壤氧化亚氮排放机制研究

微生物相互作用驱动土壤氧化亚氮排放机制研究
编号:54 稿件编号:8 访问权限:仅限参会人 更新:2024-08-10 13:58:33 浏览:64次 口头报告

报告开始:2024年08月17日 17:10 (Asia/Shanghai)

报告时间:10min

所在会议:[S4] 专题四 大气氮循环与温室气体减排 » [S4-1] 专题四 大气氮循环与温室气体减排(8月17日 下午)

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摘要
Paddy fields are hotspots of microbial denitrification, which is typically linked to the oxidation of electron donors such as methane (CH4) under anoxic and hypoxic conditions. While several anaerobic methanotrophs can facilitate denitrification intracellularly, whether and how aerobic CH4 oxidation couples with denitrification in hypoxic paddy fields remains virtually unknown. Here we combine a ~3300 km field study across main rice-producing areas of China and 13CH4-DNA-stable isotope probing (SIP) experiments to investigate the role of soil aerobic CH4 oxidation in supporting denitrification. Our results reveal positive relationships between CH4 oxidation and denitrification activities and genes across various climatic regions. Microcosm experiments confirm that CH4 and methanotroph addition promote gene expression involved in denitrification and increase nitrous oxide emissions. Moreover, 13CH4-DNA-SIP analyses identify over 70 phylotypes harboring genes associated with denitrification and assimilating 13C, which are mostly belonged to Rubrivivax, Magnetospirillum, and Bradyrhizobium. Combined analyses of 13C-metagenome-assembled genomes and 13C-metabolomics highlight the importance of intermediates such as acetate, propionate and lactate, released during aerobic CH4 oxidation, for the coupling of CH4 oxidation with denitrification. Our work identifies key microbial taxa and pathways driving coupled aerobic CH4 oxidation and denitrification, with important implications for nitrogen management and greenhouse gas regulation in agroecosystems.
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报告人
陈亢华
学生 华中农业大学

稿件作者
陈亢华 华中农业大学
刘玉荣 Huazhong Agriculture University
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