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Salinity causes differences in stratigraphic methane sources and sinks.

Ying Qu1, Yuxiang Zhao1, Xiangwu Yao1

  • 1Department of Environmental Engineering, Zhejiang University, Hangzhou, China.

Environmental Science and Ecotechnology
|December 4, 2023
PubMed
Summary
This summary is machine-generated.

Increasing salinity significantly reduces methane production but dramatically boosts methane oxidation in deep strata. This impacts microbial communities and lowers overall methane emissions, crucial for understanding the carbon cycle under environmental change.

Keywords:
Methane emissionMicrobial communityMicrobial interactionsSalinityShallow gas strata

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Area of Science:

  • Geochemistry
  • Microbiology
  • Environmental Science

Background:

  • Methane metabolism is vital for the global carbon cycle.
  • Seawater intrusion and soil salinization are increasing due to global environmental changes.
  • Understanding salinity's impact on deep strata methane emissions is crucial but understudied.

Purpose of the Study:

  • To investigate the effects of salinity on methane metabolism in terrestrial and coastal strata.
  • To analyze how salinity influences methane production, oxidation, and emission.
  • To determine salinity's impact on the structure of methane-metabolizing microbial communities.

Main Methods:

  • In situ and microcosm simulation studies were conducted on terrestrial and coastal strata (15-40 m depth).
  • Methane production and oxidation rates were measured under varying salinity conditions.
  • Methane-metabolizing microbial communities (methanogenic archaea, methanotrophic archaea, and methanotrophic bacteria) were analyzed.

Main Results:

  • Coastal strata (salinity 5x terrestrial) showed a 12.05% decrease in methane production and a 687.34% increase in methane oxidation.
  • Overall methane emissions were reduced by 146.31% in higher salinity conditions.
  • Salinity significantly altered microbial community composition, affecting methanogenic archaea (16.53%), methanotrophic archaea (27.25%), and methanotrophic bacteria (22.94%).

Conclusions:

  • Salinity is a key factor controlling methane metabolism and emissions in deep strata.
  • Increased salinity shifts the balance from methane production to oxidation, reducing net emissions.
  • Microbial community structure and interactions play a significant role in regulating methane dynamics under varying salinity.