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Disproportionate microbial responses to decadal drainage on a Siberian floodplain

Cited 3 time in wos
Cited 3 time in scopus
Disproportionate microbial responses to decadal drainage on a Siberian floodplain
Other Titles
시베리아 습지에서 10년간의 배수에 따른 불규칙적 미생물 반응
Kwon, Min Jung
Tripathi, Binu Mani
Goeckede, Mathias
Shin, Seung Chul
Myeong, Nu Ri
Lee, Yoo Kyung
Kim, Mincheol
Biodiversity & ConservationEnvironmental Sciences & Ecology
CO2 and CH4 fluxlong-term drainagemetagenome-assembled genomesmethanogenspermafrost thawsoil microbiome
Issue Date
Kwon, Min Jung, et al. 2021. "Disproportionate microbial responses to decadal drainage on a Siberian floodplain". GLOBAL CHANGE BIOLOGY, 27(20): 5124-5140.
Permafrost thaw induces soil hydrological changes which in turn affects carbon cycle processes in the Arctic terrestrial ecosystems. However, hydrological impacts of thawing permafrost on microbial processes and greenhouse gas (GHG) dynamics are poorly understood. This study examined changes in microbial communities using gene and genome-centric metagenomics on an Arctic floodplain subject to decadal drainage, and linked them to CO2 and CH4 flux and soil chemistry. Decadal drainage led to significant changes in the abundance, taxonomy, and functional potential of microbial communities, and these modifications well explained the changes in CO2 and CH4 fluxes between ecosystem and atmosphere―increased fungal abundances potentially increased net CO2 emission rates and highly reduced CH4 emissions in drained sites corroborated the marked decrease in the abundance of methanogens and methanotrophs. Interestingly, various microbial taxa disproportionately responded to drainage: Methanoregula, one of the key players in methanogenesis under saturated conditions, almost disappeared, and also Methylococcales methanotrophs were markedly reduced in response to drainage. Seven novel methanogen population genomes were recovered, and the metabolic reconstruction of highly correlated population genomes revealed novel syntrophic relationships between methanogenic archaea and syntrophic partners. These results provide a mechanistic view of microbial processes regulating GHG dynamics in the terrestrial carbon cycle, and disproportionate microbial responses to long-term drainage provide key information for understanding the effects of warming-induced soil drying on microbial processes in Arctic wetland ecosystems.
Appears in Collections  
2021-2021, Changes in biogeochemical processes of Arctic terrestrial ecosystem in response to climate change (21-21) / Jung, Ji Young (PN21012)
2021-2021, Study on polar ecosystem change by warming and adaptation mechanisms of polar organism (21-21) / Kim, Sanghee (PE21140)
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