CaO2调控潜育化稻田CH4排放的动态特征及机制
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关键词：潜育化稻田；过氧化钙；产 CH4 菌；CH4氧化菌；CH4排放中图分类号：X71;S511 文献标志码：A 文章编号：1672-2043（2025）11-2994-11 doi：10.11654/jaes.2024-1091
Abstract：Long-termwaterlogingingleizationpaddyfieldscreatesanaerobicsoilconditionsthatpromotesubstantialacuulationof reductivesubstance，whichnotonlyimpedesricegrowthbutalsoexacerbates methane（CH4）eisions.Toadressthisissealcium peroxide（ CaO2 ） granules（2-3 mm diameter） prepared through disc granulation were applied to investigate their impacts on CH .4 emissions andunderlying mechanisms undercontiuousflooding.Apotexperimentwithfourtreatments asconducted：control（CK），andthree CaO2 application rates （LC： 0.15 g⋅kg-1 ，MC： 0.30 g⋅kg-1 ，HC： 0.60 g⋅kg-1 ，freshsoil basis）. Systematic analyses were performed on soil physicochemicalproptisductiesubstancsrobialfunctioalgenbundc，ndCHisios.Kefdingsevealedl （204号 CaO2 treatments initially suppressed CH .4 emissions within 43 days after transplanting，but ultimately enhanced emissions by maturity. The MC treatment showed 88.2% higher cumulative emissions than CK， though 29.2% and 10.4% lower than LC and HC treatments respectively.LC treatment demonstrated superior reduction efficiency for total reductive substances （ 0.1% ），active reductive substances （ 0.6% ），F e2+（3.0%） ，and Mn2+（8.2% ）compared to CK.Methanogen（mcrA） gene abundance increased across alltreatments （ LC>HC> MC），while methanotroph（pmoA） abundance decreased in LC，MC but increased in HC. CaO2 amendments elevated soil pH and dissolved organic carbon（DOC）， while reducing NH4-N and NOj-N contents.These findings indicate that CaO2 application can temporarily mitigate （204号 CH4 emissions within 43 days，but exhibits complex long-term dynamics.
Keywords：submerged rice soil; calcium peroxide;methanogens;methanotrophs; CH4 emission
甲烷（ CH4 ）是仅次于二氧化碳（ CO2 ）的第二大温室气体，其百年全球增温潜势（GWP）是 CO2 的27.9倍，具有很强的温室效应1。（剩余22110字）
