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Methane emissions in triple rice cropping: patterns and a method for reduction.

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Methane emissions from Mekong Delta rice paddies increase with each crop due to rice straw buildup. Natural floods reset emissions, highlighting straw management as key to reducing greenhouse gases.

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Area of Science:

  • Agricultural Science
  • Environmental Science
  • Climate Change Research

Background:

  • Mekong Delta rice paddies are significant methane emission hotspots.
  • Methane emissions from these paddies are not well understood.
  • Rice cultivation contributes to greenhouse gas emissions.

Purpose of the Study:

  • To analyze methane emission patterns in typical triple rice cropping paddies.
  • To identify factors influencing seasonal and annual methane emission variations.
  • To provide insights into reducing methane emissions in rice cultivation.

Main Methods:

  • Monitoring methane emissions over five years from typical triple rice cropping paddies.
  • Analyzing emission patterns in relation to crop cycles and irrigation.
  • Investigating the role of rice-derived carbon and crop residue.

Main Results:

  • Methane emissions doubled in the second crop and tripled in the third crop season.
  • Emissions reset annually after the Mekong River's natural flood.
  • Emission peaks occurred 0-3 weeks after irrigation, primarily at the rice heading stage.
  • Accumulated rice straw from preceding crops significantly increased emissions.

Conclusions:

  • Avoiding rice straw incorporation into soil is crucial for reducing methane emissions.
  • Decomposing rice straw in paddy surface water with dissolved oxygen minimizes methanogenesis.
  • Seasonal management of rice straw can mitigate greenhouse gas contributions from rice paddies.