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A simplified sampling procedure for the estimation of methane emission in rice fields

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Abstract

Manual closed chamber methods are widely used for CH4 measurement from rice paddies. Despite diurnal and seasonal variations in CH4 emissions, fixed sampling times, usually during the day, are used. Here, we monitored CH4 emission from rice paddies for one complete rice-growing season. Daytime CH4 emission increased from 0800 h, and maximal emission was observed at 1200 h. Daily averaged CH4 flux increased during plant growth or fertilizer application and decreased upon drainage of plants. CH4 measurement results were linearly interpolated and matched with the daily averaged CH4 emission calculated from the measured results. The time when daily averaged emission and the interpolated CH4 curve coincided during the daytime was largely invariant within each of the five distinctive periods. One-hourly sampling during each of these five periods was utilized to estimate the emission during each period, and we found that five one-hourly samples during the season accurately reflected the CH4 emission calculated based on all 136 hourly samples. This new sampling scheme is simple and more efficient than current sampling practices. Previously reported sampling schemes yielded estimates 9 to 32% higher than the measured CH4 emission, while our suggested scheme yielded an estimate that was only 5% different from that based on all 136-h samples. The sampling scheme proposed in this study can be used in rice paddy fields in Korea and extended worldwide to countries that use similar farming practices. This sampling scheme will help in producing more accurate global methane budget from rice paddy fields.

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Acknowledgements

This study was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT, & Future Planning (NRF-2015R1A2A1A09005838).

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, Hanyang University, Haengdang-dong, Seongdong-gu, Seoul, 04763, South Korea

    Nadar Hussain Khokhar & Jae-Woo Park

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  1. Nadar Hussain Khokhar
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  2. Jae-Woo Park
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Correspondence to Jae-Woo Park.

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Highlights

• Measured CH4 were interpolated and matched with the average daily CH4 emission.

• The time when the two were the same was invariant within each of the five periods.

• One-hourly sampling in each period can be used to estimate the emission.

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Khokhar, N.H., Park, JW. A simplified sampling procedure for the estimation of methane emission in rice fields. Environ Monit Assess 189, 468 (2017). https://doi.org/10.1007/s10661-017-6184-z

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