Mediative Mechanism of Freezing/Thawing on Greenhouse Gas Emissions in an Inland Saline-Alkaline Wetland: a Metagenomic Analysis

Microbial Ecology - Tập 86 - Trang 985-996 - 2022
Yupeng Zhang1,2, Fengqin Liu3, Hong Liang1,4, Dawen Gao1,4
1Collaborative Innovation Center of Energy Conservation & Emission Reduction and Sustainable Urban-Rural Development in Beijing, Beijing University of Civil Engineering and Architecture, Beijing, China
2College of Resources and Environmental Sciences, Henan Agricultural University, Zhengzhou, China
3College of Life Sciences, Henan Agricultural University, Zhengzhou, China
4Centre for Urban Environmental Remedeation, Beijing University of Civil Engineering and Architecture, Beijing, China

Tóm tắt

Inland saline-alkaline wetlands distributed in the mid-high latitude have repeatedly experienced freezing and thawing. However, the response of greenhouse gas (GHG) emission and microbially-mediated carbon and nitrogen cycle to freezing and thawing remains unclear. We monitored the GHG flux in an inland saline-alkaline wetland and found that, compared with the growth period, the average CO2 flux decreased from 171.99 to 76.61–80.71 mg/(m2‧h), the average CH4 flux decreased from 10.72 to 1.96–3.94 mg/(m2‧h), and the average N2O flux decreased from 56.17 to − 27.14 to − 20.70 μg/(m2‧h). Freezing and thawing significantly decreased the relative abundance of functional genes involved in carbon and nitrogen cycles. The aceticlastic methanogenic pathway was the main methanogenic pathway, whereas the Candidatus Methylomirabilis oxyfera was the most abundant methane oxidizer in the wetland. Ammonia-oxidizing archaea and denitrifier belonging to proteobacteria was the major microbial N2O source, while bacteria within clade II nosZ was the major microbial N2O sink. Freezing and thawing reduced the relative abundance of these genes, leading to a decrease in GHG flux.

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