4.1 Article

Appropriate chamber deployment time for separate quantification of CH4 emissions via plant and ebullition from rice paddies using a modified closed-chamber method

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Article Agriculture, Multidisciplinary

Quantifying bubbling emission (ebullition) of methane from a rice paddy using high-time-resolution concentration data obtained during a closed-chamber measurement

Masako Kajiura et al.

Summary: A method was developed to quantify methane emissions from rice-paddy soil through ebullition events. Field measurements at different rice growth stages showed that ebullition dominated at booting and heading stages, while plant-mediated emissions showed smaller variation among growth stages. Both ebullition and plant-mediated emissions were significantly correlated with air temperature, but ebullition showed a higher dependency on temperature compared to plant-mediated emissions.

JOURNAL OF AGRICULTURAL METEOROLOGY (2021)

Article Agriculture, Multidisciplinary

Increasing measurement throughput of methane emission from rice paddies with a modified closed-chamber method

Takeshi Tokida

Summary: A modified closed-chamber method has been developed for high-throughput measurements of CH4 emissions from rice paddies, using a portable gas analyzer and a newly developed dehumidification system. This method significantly reduces chamber deployment time and effectively removes the risk of water condensation without attenuating CH4 concentration signal, making it suitable for high-throughput measurements and studying bubbling CH4 emissions.

JOURNAL OF AGRICULTURAL METEOROLOGY (2021)