Effect of mangrove biochar on methane production, oxidation and emission of rice cultivation in clay loam soil
บทความในวารสาร
ผู้เขียน/บรรณาธิการ
กลุ่มสาขาการวิจัยเชิงกลยุทธ์
รายละเอียดสำหรับงานพิมพ์
รายชื่อผู้แต่ง: Sriphirom P., Chidthaisong A., Yagi K., Tripetchkul S., Boonapatcharoen N., Towprayoon S.
ผู้เผยแพร่: AIDIC:The Italian Association of Chemical Engineering
ปีที่เผยแพร่ (ค.ศ.): 2021
Volume number: 83
หน้าแรก: 349
หน้าสุดท้าย: 354
จำนวนหน้า: 6
นอก: 22839216
ภาษา: English-Great Britain (EN-GB)
บทคัดย่อ
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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