Rice plants reduce methane emissions in high-emitting paddies

F1000Research
Masato Oda, Nguyen Huu Chiem

Abstract

Background: Rice is understood to enhance methane emissions from paddy fields in IPCC guidelines. However, rice actually has two opposite functions related to methane: i) emission enhancement, such as by providing emission pathways (aerenchyma) and methanogenetic substrates; and ii) emission suppression by providing oxygen pathways, which suppress methanogenesis or enhance methane oxidation. The overall role of rice is thus determined by the balance between its enhancing and suppressing functions. Although previous studies have suggested that rice enhances total methane emissions, we aimed to demonstrate in high-emitting paddy fields that the overall methane emission is decreased by rice plants. Methods: We compared methane emissions with and without rice plants in triple cropping rice paddy fields in the Mekong Delta, Vietnam. The gas samples are collected using chamber method and ware analyzed by gas chromatography. Results: We found that rice, in fact, suppressed overall methane emissions in high-emitting paddies. The emission reductions increased with the growth of rice to the maximum tillering stage, then decreased after the heading stage, and finally recovered.  Discussion:  Our result indicates that the overall methane e...Continue Reading

References

Sep 1, 1996·Environmental Monitoring and Assessment·R WassmannH Rennenberg
May 4, 2017·Global Change Biology·Yu JiangWeijian Zhang

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Citations

Jul 2, 2020·F1000Research·Masato Oda, Huu Chiem Nguyen

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