气候变化领域集成服务门户(CCPortal): Sink or Source: Alternative Roles of Glacier Foreland Meadow Soils in Methane Emission Is Regulated by Glacier Melting on the Tibetan Plateau

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DOI	10.3389/fmicb.2022.862242
	Sink or Source: Alternative Roles of Glacier Foreland Meadow Soils in Methane Emission Is Regulated by Glacier Melting on the Tibetan Plateau
	Xing, Tingting; Liu, Pengfei; Ji, Mukan; Deng, Yongcui; Liu, Keshao; Wang, Wenqiang; Liu, Yongqin
通讯作者	Liu, PF (通讯作者)
发表日期	2022
EISSN	1664-302X
卷号	13
英文摘要	Glacier foreland soils have long been considered as methane (CH4) sinks. However, they are flooded by glacial meltwater annually during the glacier melting season, altering their redox potential. The impacts of this annual flooding on CH4 emission dynamics and methane-cycling microorganisms are not well understood. Herein, we measured in situ methane flux in glacier foreland soils during the pre-melting and melting seasons on the Tibetan Plateau. In addition, high-throughput sequencing and qPCR were used to investigate the diversity, taxonomic composition, and the abundance of methanogenic archaea and methanotrophic bacteria. Our results showed that the methane flux ranged from -10.11 to 4.81 mu g center dot m(-2)center dot h(-1) in the pre-melting season, and increased to 7.48-22.57 mu g center dot m(-2)center dot h(-1) in the melting season. This indicates that glacier foreland soils change from a methane sink to a methane source under the impact of glacial meltwater. The extent of methane flux depends on methane production and oxidation conducted by methanogens and methanotrophs. Among all the environmental factors, pH (but not moisture) is dominant for methanogens, while both pH and moisture are not that strong for methanotrophs. The dominant methanotrophs were Methylobacter and Methylocystis, whereas the methanogens were dominated by methylotrophic Methanomassiliicoccales and hydrogenotrophic Methanomicrobiales. Their distributions were also affected by microtopography and environmental factor differences. This study reveals an alternative role of glacier foreland meadow soils as both methane sink and source, which is regulated by the annual glacial melt. This suggests enhanced glacial retreat may positively feedback global warming by increasing methane emission in glacier foreland soils in the context of climate change.
关键词	IN-SITU MEASUREMENTS ANAEROBIC OXIDATION METHANOGENIC ARCHAEA COMMUNITY CH4 METHANOTROPHS DIVERSITY FLUX CO2 WETLANDS
英文关键词	methane flux; methanogens; methanotrophs; glacier foreland; Tibetan Plateau
语种	英语
WOS研究方向	Microbiology
WOS类目	Microbiology
WOS记录号	WOS:000779687400001
来源期刊	FRONTIERS IN MICROBIOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260676
推荐引用方式 GB/T 7714	Xing, Tingting,Liu, Pengfei,Ji, Mukan,et al. Sink or Source: Alternative Roles of Glacier Foreland Meadow Soils in Methane Emission Is Regulated by Glacier Melting on the Tibetan Plateau[J]. 中国科学院青藏高原研究所,2022,13.
APA	Xing, Tingting.,Liu, Pengfei.,Ji, Mukan.,Deng, Yongcui.,Liu, Keshao.,...&Liu, Yongqin.(2022).Sink or Source: Alternative Roles of Glacier Foreland Meadow Soils in Methane Emission Is Regulated by Glacier Melting on the Tibetan Plateau.FRONTIERS IN MICROBIOLOGY,13.
MLA	Xing, Tingting,et al."Sink or Source: Alternative Roles of Glacier Foreland Meadow Soils in Methane Emission Is Regulated by Glacier Melting on the Tibetan Plateau".FRONTIERS IN MICROBIOLOGY 13(2022).