Factors controlling diel patterns of methane emission via rice
Abstract
Methane emissions from flooded rice grown under greenhouse conditions were monitored using a closed chamber technique. The three rice cultivars showed similar diel emission patterns through the amplitudes differed. Variation in emissions (maximum emission rate) from the different cultivars ranged from 0.164-0.241 mg/pot/h at tillering stage, 0.714-2.334 mg/pot/h at heading stage, 0.399-1.393 mg/pot/h at ripening stage. The methane emissions increased in the morning at accelerating rates, reached a maximum in the early afternoon, then decreased rapidly to constant rates during the night. The diel emission pattern was modeled using a Gaussian equation for daytime, and a constant for nocturnal emissions. Applying an Arrhenius equation, more than 90% of the diel variation of methane emissions could be predicted from soil temperature fluctuations. The predictions improved by using a diffusion model based on soil temperature and dissolved methane concentrations in soil solution. Soil temperature and methane concentration in soil solution are the two major factors controlling diel methane emissions.
Source or Periodical Title
Nutrient Cycling in Agroecosystems
ISSN
13851314
Page
229-235
Document Type
Article
Subject
Controlling factor, Diel methane emission pattern, Dissolved methane, Rice, Soil temperature
Recommended Citation
Wang, B.; Neue, H. U.; and Samonte, H. P., "Factors controlling diel patterns of methane emission via rice" (2021). Journal Article. 3426.
https://www.ukdr.uplb.edu.ph/journal-articles/3426
