The Synergism between Methanogens and Methanotrophs and the Nature of their Contributions to the Seasonal Variation of Methane Fluxes in a Wetland: The Case of Dajiuhu Subalpine Peatland

Autor: Yaoyao Liu, Jiwen Ge, Liang Feng, Yu Li, Zhiqi Zhang, Xiang Xiao, Luwen Wang, Jiumei Wang
Rok vydání: 2022
Předmět:
Zdroj: Advances in Atmospheric Sciences. 39:1375-1385
ISSN: 1861-9533
0256-1530
DOI: 10.1007/s00376-021-1255-z
Popis: Wetland ecosystems are the most important natural sources of methane (CH4), with periodical changes of CH4 fluxes observed. Methanogens and methanotrophs are considered as the key factors affecting CH4 fluxes in wetlands. However, the relationship between methanogens and methanotrophs was still unclear. To close this gap, samples at four depths of soil in the Dajiuhu subalpine peatland in January, April, July, and October 2019 were collected and CH4 fluxes data from the eddy covariance (EC) system was acquired. The phylogenetic molecular ecological networks (pMENs) analysis was used to identify keystone species and the seasonal variations of co-occurrence patterns of methanogenic and methanotrophic communities. The results indicated that the seasonal variations of interactions between methanogenic and methanotrophic communities contributed to CH4 emissions in wetland. The keystone species discerned by network analysis also showed their importance in mediating CH4 fluxes. CH4 emissions in wetland were lowest in spring, during this period, most complex interactions between microbes were observed, with the intense competition among methanogens while methanotrophs represented better cooperation. Reverse patterns manifested in summer, when the highest CH4 flux was observed. Meanwhile, Methanoregula formicica was proven negatively correlated with CH4 fluxes that occupied largest ecological niches in the spring network, and Methanocella arvoryzae, as well as Methylocystaceae had positive correlations with CH4 fluxes survived better in the microbial community in summer. In addition, soil temperature and nitrogen were regarded as significant environmental factors to CH4 fluxes. This study explained the seasonal patterns and microbial driving mechanisms of CH4 emissions in wetlands.
Databáze: OpenAIRE
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