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Related Experiment Video

Updated: May 8, 2025

Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures
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Terrestrial Organic Matter Inputs Modulate Methane Emissions from a Mega-Reservoir.

Yongqiang Zhou1,2, Ting Zhang1,2, Lei Zhou3

  • 1Taihu Laboratory for Lake Ecosystem Research, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 211135, China.

Environmental Science & Technology
|March 28, 2025
PubMed
Summary
This summary is machine-generated.

Terrestrial organic matter input into reservoirs fuels methane (CH4) emissions by depleting dissolved oxygen and providing carbon substrates. This study quantifies CH4 flux and identifies key degradation pathways in Lake Qiandao.

Keywords:
FT-ICR MSLake Qiandaodissolved oxygenmethaneterrestrial organic matter

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Biogeochemistry

Background:

  • Reservoirs are significant sources of methane (CH4) emissions, yet the influence of terrestrial organic matter (OM) on these emissions in large systems is poorly understood.
  • Understanding the fate of terrestrial OM and its role in CH4 production is crucial for accurate climate modeling and reservoir management.

Purpose of the Study:

  • To investigate the impact of terrestrial organic matter input and degradation on methane emissions from a large Chinese mega-reservoir, Lake Qiandao.
  • To quantify the annual methane flux and identify the primary drivers and pathways of CH4 production.

Main Methods:

  • Conducted monthly sampling at 100 sites over one year and monthly vertical profile observations for seven months.
  • Analyzed water chemistry, organic matter composition, and stable isotopes (δ13C-CH4, δ18O-H2O).
  • Performed anoxic bioincubation experiments to simulate OM degradation and CH4 production.

Main Results:

  • Estimated an annual mean CH4 flux (FCH4) of 0.26 g C m-2 yr-1.
  • Observed elevated FCH4 and enriched δ13C-CH4 linked to low dissolved oxygen, high organic matter, and terrestrial OM indicators.
  • Anoxic incubation showed rapid riverine OM degradation, a 56-fold increase in dissolved CH4 (cCH4), and significant isotopic shifts, indicating acetoclastic methanogenesis.

Conclusions:

  • Terrestrial organic matter input and degradation significantly contribute to methane emissions in large reservoirs.
  • The process involves depletion of dissolved oxygen and the formation of carbon substrates that enhance CH4 production, primarily through acetoclastic pathways.
  • These findings highlight the critical role of terrestrial OM in regulating greenhouse gas emissions from reservoirs.