2024年學術報告“有機碳的氧化态與微生物産甲烷過程之間的熱力學思考”
太阳集团1088vip暨廣東省環境污染控制與修複技術重點實驗室
報告題目：有機碳的氧化态與微生物産甲烷過程之間的熱力學思考
報 告 人：胡瑞文 博士後研究員
美國勞倫斯伯克利實驗室與加州大學伯克利分校
時 間：2024年09月03日（周二）下午15:00-18:00
地 點：東校園環境大樓A206
主 持：王成 副教授
歡迎廣大師生參加！
報告人簡介：
胡瑞文，美國勞倫斯伯克利實驗室與加州大學伯克利分校聯合培養博士後。本人于2022年獲得太阳集团app首页環境學院環境科學博士學位。目前主要從事環境微生物組學、微生物生态學和生物信息學研究。擔任期刊 Frontiers in Microbiology 的客座編輯。相關研究成果以第一作者發表在環境微生物和生态領域高質量期刊 Environmental Science & Technology、Trends in microbiology、Environment International、Functional Ecology、Biology and Fertility of Soils、Science Total of Environment等8篇， 并主持國家自然科學基金青年項目。
報告内容簡介：
Microbial methanogenesis has an important influence on Earth’s changing climate, but the role of organic carbon composition in controlling methane fluxes and carbon-use efficiency in anaerobic microbial ecosystems is not fully characterized. It is proposed that the mineralization of organic carbon sources with a negative nominal oxidation state of carbon (NOSC) is thermodynamically recalcitrant in anaerobic soils. To profile how systematic variations in the oxidation state of organic carbon influence methane fluxes and carbon-use efficiency of methanogenic microbiomes, we prepared long term anaerobic mesocosms from rice field sediment amended with different monomeric carbon sources varying in NOSC. We found that carbon with negative NOSC is slower to be catabolized, but produces more methane and less carbon dioxide per mole of carbon. 16S rRNA amplicon and metagenomic sequencing data showed that negative NOSC carbon also increases the alpha diversity, increases the abundance of syntrophs and methanogens, and enriches for fermentation pathways that generate more organic acids. Our results provide mechanistic insights into how the oxidation state of organic carbon can control methane and carbon dioxide fluxes and alter the carbon flow pathways in methanogenic microbiomes. Also, given the higher greenhouse forcing potential of methane compared to carbon dioxide, our results suggest important trade-offs and risks inherent in strategies aimed at storing carbon in thermodynamically recalcitrant forms.