Microbiota-induced asymmetry in coastal methane emission potential under experimental precipitation gradients.

IF 7.7 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Environmental Research Pub Date : 2024-12-11 DOI:10.1016/j.envres.2024.120601
Lifeng Zhou, Lirong Zhang, Run Dang, Guangxuan Han, Jian Liu, Meng Zhou, Leilei Xiao
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Abstract

Climate models predict that the frequency and intensity of extreme precipitation events will increase globally. Despite carbon budget in coastal wetlands is known to be sensitive to precipitation variability, in where CH4 productions and potential mechanisms remain poorly understood. We investigated CH4 emission potential and its drivers after 7-year of field experiments with five precipitation gradients (-60%, -40%, ambient condition, +40%, +60%) in Yellow River Delta, China. The response of CH4 emission potential to precipitation gradients exhibited significant asymmetry, with the highest emission potential occurring under +40% precipitation. 13C-isotope tracing experiment discovered the primary contribution of acetoclastic methanogenic pathway. +40% precipitation significantly improved the accumulation of aboveground biomass, soil organic carbon and total nitrogen. Microbial community abundance, but not composition, referring to metagenome-assembled genomes also actively responded to precipitation changes. For example, +40% precipitation increased the relative abundance of Methanosarcinia and Methanobacteria. Furthermore, CH4 emission potential was also promoted by higher microbial enzyme activity. Collectively, CH4 emission potential in response to 7-year experimental precipitations was regulated by microbiota-driven, showing obvious asymmetry.

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气候模型预测,全球极端降水事件的频率和强度都将增加。尽管众所周知沿海湿地的碳预算对降水变化很敏感,但人们对其中的 CH4 生成和潜在机制仍然知之甚少。我们在中国黄河三角洲的五个降水梯度(-60%、-40%、常温、+40%、+60%)进行了为期 7 年的野外实验,研究了 CH4 排放潜力及其驱动因素。CH4排放潜势对降水梯度的响应表现出明显的不对称性,降水+40%时排放潜势最高。13C 同位素示踪实验发现了乙酰甲烷生成途径的主要贡献。+40%的降水量明显增加了地上生物量、土壤有机碳和总氮的积累。微生物群落丰度(而非组成)也对降水变化做出了积极反应。例如,+40%的降水量增加了甲烷杆菌(Methanosarcinia)和甲烷杆菌(Methanobacteria)的相对丰度。此外,较高的微生物酶活性也提高了 CH4 的排放潜力。总之,CH4排放潜力对7年实验降水的响应是由微生物群驱动调节的,表现出明显的不对称性。
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来源期刊
Environmental Research
Environmental Research 环境科学-公共卫生、环境卫生与职业卫生
CiteScore
12.60
自引率
8.40%
发文量
2480
审稿时长
4.7 months
期刊介绍: The Environmental Research journal presents a broad range of interdisciplinary research, focused on addressing worldwide environmental concerns and featuring innovative findings. Our publication strives to explore relevant anthropogenic issues across various environmental sectors, showcasing practical applications in real-life settings.
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