Variations in the archaeal community and associated methanogenesis in peat profiles of three typical peatland types in China

Environmental Microbiome

Research

Yue Wang¹  Dan Xue²  Huai Chen³  Xuhui Chen⁴  Qing Qiu⁴  Jiawen Liu⁵  Lin Wu⁶  Meng Wang⁷ 

[1] CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization and Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, No. 9, Section 4, South Renmin Road, 610041, Chengdu, China;University of Chinese Academy of Sciences, 100049, Beijing, China;CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization and Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, No. 9, Section 4, South Renmin Road, 610041, Chengdu, China;Zoige Peatland and Global Change Research Station, Chinese Academy of Sciences, 624400, Hongyuan, China;CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization and Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, No. 9, Section 4, South Renmin Road, 610041, Chengdu, China;Zoige Peatland and Global Change Research Station, Chinese Academy of Sciences, 624400, Hongyuan, China;CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences (CAS), 100101, Beijing, China;CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization and Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, No. 9, Section 4, South Renmin Road, 610041, Chengdu, China;Zoige Peatland and Global Change Research Station, Chinese Academy of Sciences, 624400, Hongyuan, China;University of Chinese Academy of Sciences, 100049, Beijing, China;SQE Department, COFCO Coca-Cola Beverages (Sichuan) Company Limited, 610500, Chengdu, China;School of Forestry and Horticulture, Hubei Minzu University, 445000, Enshi, Hubei, China;State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, Institute for Peat and Mire Research, Northeast Normal University, 130024, Changchun, China;

关键词: Peatland;    Methane;    Archaeal community;    Peat properties;    Methanogenesis;   

DOI  :  10.1186/s40793-023-00503-y

 received in 2023-03-08, accepted in 2023-05-15,  发布年份 2023

来源: Springer

【 摘 要 】

BackgroundPeatlands contain about 500 Pg of carbon worldwide and play a dual role as both a carbon sink and an important methane (CH4) source, thereby potentially influencing climate change. However, systematic studies on peat properties, microorganisms, methanogenesis, and their interrelations in peatlands remain limited, especially in China. Therefore, the present study aims to investigate the physicochemical properties, archaeal community, and predominant methanogenesis pathways in three typical peatlands in China, namely Hani (H), Taishanmiao (T), and Ruokeba (R) peatlands, and quantitively determine their CH4 production potentials.ResultsThese peatlands exhibited high water content (WC) and total carbon content (TC), as well as low pH values. In addition, R exhibited a lower dissolved organic carbon concentration (DOC), as well as higher total iron content (TFe) and pH values compared to those observed in T. There were also clear differences in the archaeal community between the three peatlands, especially in the deep peat layers. The average relative abundance of the total methanogens ranged from 10 to 12%, of which Methanosarcinales and Methanomicrobiales were the most abundant in peat samples (8%). In contrast, Methanobacteriales were mainly distributed in the upper peat layer (0–40 cm). Besides methanogens, Marine Benthic Group D/Deep-Sea Hydrothermal Vent Euryarchaeotic Group 1 (MBG–D/DHVEG–1), Nitrosotaleales, and several other orders of Bathyarchaeota also exhibited high relative abundances, especially in T. This finding might be due to the unique geological conditions, suggesting high archaeal diversity in peatlands. In addition, the highest and lowest CH4 production potentials were 2.38 and 0.22 μg g−1 d−1 in H and R, respectively. The distributions of the dominant methanogens were consistent with the respective methanogenesis pathways in the three peatlands. The pH, DOC, and WC were strongly correlated with CH4 production potentials. However, no relationship was found between CH4 production potential and methanogens, suggesting that CH4 production in peatlands may not be controlled by the relative abundance of methanogens.ConclusionsThe results of the present study provide further insights into CH4 production in peatlands in China, highlighting the importance of the archaeal community and peat physicochemical properties for studies on methanogenesis in distinct types of peatlands.

【 授权许可】

CC BY   
© The Author(s) 2023

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