不同水分管理条件下添加水铁矿对稻田 N₂O 排放的影响

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关键词：干湿交替灌溉；持续淹水灌溉；水铁矿； N20

中图分类号：X144 文献标志码：A 文章编号：1672-2043（2025）10-2709-11 doi：10.11654/jaes.2024-1150

Abstract：AssoilmendnteiditeseatpotetialtdcesolOisios.refore，thisdyxplodtsf ferihydriteonNOeissonsfrompaddysoilsinHananunderdiferentwatermanagementconditionsthroughlaboratoryncubation experiments.Thetreatmentsereasfollo：aleateweidringigaoncontrol（AWD-CK）alerateweingdrgatio + （204号 0.5% ferrihydrite（AWD-FH），continuous flooding irrigation control（CF-CK），continuous flooding irrigation +0.5% ferrihydrite（CF-FH）. Theresultsshowedthat：NOemissionsunderalteratewettnganddryingirigationwerehigherthanthoseundercontinuouflooding irrigation.The addition of ferrihydrite could significantly reduce N2O emissions，which was reduced by 31.21% in the alternate wetting and drying irrigation environment and 58.33% inthe flooding condition.Under the same water conditions，the addition of ferrihydrite significantly reduced NO Ncontent.The addition of ferrihydrite significantly increased microbial biomass nitrogen（MBN）by 26.23% Theaddition offerrihydrite significantly promoted the activityof 4-methylumbellferone phosphatase（PHOS）by 25.47% ，inhibited the activityof N-acetyl- β- D-glucosaminidase（NAG）by 36.38% and the activity of leucine aminopeptidase（LAP）by 18.69 % ，which was beneficialtoreducenitrficationanddenitrificationsubstratesandreduceNOemissons.Undertheconditionofcontinuousflooding irrigation，theadditionofferrihydrite hadnosignificant effect on PHOSandNAG，theactivity of β-1 ，4-glucosidase（BG）increased by 28.75% ，andtheactivity ofLAPdecreased by 44.56% .Aftertheadditionof ferrihydrite，N2O emissions showed positive correlationswith soilorganicmatervlableotass，pHmmotrogenratentrogenndsoiletracellars，ileiig negativeorelationithomassogenThsidcatestatrbonrogensporus，oaiu，ndmcroganioil colectivelygateentioofO.IocusodofditeemostratesoteialinigatigNOo and reducing nitrogen loss in tropical paddy soils.

Keywords：alternate wetting-drying irrigation; continuous flooding irrigation; ferrihydrite; N2O

氧化亚氮（ N20 ）是一种重要的温室气体，其全球增温潜势是二氧化碳的265倍，严重影响全球气候变化。（剩余23528字）