Effect of mangrove biochar on methane production, oxidation and emission of rice cultivation in clay loam soil

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Author list: Sriphirom P., Chidthaisong A., Yagi K., Tripetchkul S., Boonapatcharoen N., Towprayoon S.

Publisher: AIDIC:The Italian Association of Chemical Engineering

Publication year: 2021

Volume number: 83

Start page: 349

End page: 354

Number of pages: 6

ISSN: 22839216

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85100978376&doi=10.3303%2fCET2183059&partnerID=40&md5=02f7ee9ccccc7f0985513854bbdd49e2

Languages: English-Great Britain (EN-GB)

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Abstract

Biochar is recommended as soil amendment to CH4 emissions from rice growing. However, CH4 mitigation mechanisms are not well known. This study aimed to evaluate the changes of CH4 production, oxidation and emission of rice cultivation soil that was amended by mangrove biochar to explain the mitigation way. Biochar at rate equivalent to 10 t ha–1 was thoroughly mixed with clay loam soil within the 0.32 m3 bucket on 16th d before rice was sown under greenhouse condition. The redox potential (Eh), dissolved organic carbon (DOC), sulfate (SO42–) and nitrate (NO3–) of soil and CH4 emission were measured throughout cultivation season, while abundances of methanogens and methanotrophs and activities of CH4 production and oxidation were determined from soil that collected in two critical stages (tillering and heading) of rice growth. The results show that biochar enhanced soil oxidation capacity through increasing soil Eh (ranging of 11–26 mV) and major electron acceptors (average of 77.3 % in SO42– and 42.1 % in NO3–) throughout rice growth period. It also enhanced soil DOC in the most stages of rice cultivation. These effects did not influence the significant change of CH4 producer (methanogenic archaea) and CH4 production activity as compared to no amendment soil. A high porosity and surface area of mangrove biochar stimulated CH4 consumer (methanotrophic bacteria), resulting in enhanced CH4 oxidation activity by 11.8 % in tillering stage and 34.4 % in heading stage. This greater CH4 oxidation activity influenced the significant reduction of seasonal CH4 emission by 24.5 %. A major factor of CH4 emissions mitigation from rice cultivation by biochar amendment is the increment of CH4 oxidation particularly during heading stage. Copyright © 2021, AIDIC Servizi S.r.l.

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