江汉平原长期稻虾种养对潮土 N2O 排放的影响
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中图分类号：X71；S511;S966.12 文献标志码：A 文章编号：1672-2043（2025）08-2211-10 doi：10.11654/jaes.2025-0108
Effectsoflong-termrice-crayfishco-culturesystemon N2O emissionin the fluvo-aquic soil in JianghanPlain NIEJiangwen1，ZHU Jie²，JIANGMengdie1，ZHUBo1，LIU Zhangyong1，HEHao3*
（1.HubeiKeyLaboratoryofWaterlogingDisasterandAgriculturalUseofWetland/EngineringResearch CenterofEcologyand AgriculturalUseofWetland，nistryofducatio，legeofgulture，YangtzeUniversityJingo4345，ia;iag AcademyofAgculturaliences，iangang440o，hia;3.aneicademyofAgiculturalience，awei566ina） Abstract：Therice-crayfishco-culture（RC）systemplaysacrucialroleinpromoting thesustainabledevelopmentofricepadiesand enhancingtheircolgicalbeneits.Howevr，telongtefectsoftissteonoilNOmissiospartiularlytheehassat diferentsoildepths，arenotytwellunderstod.Tisstudasedoan8-yearfeldexperimentintheJanghanPlainoctedsoil samples from the surface（ 0-20cm ）and subsurface（2O-40 cm） layers under RC and conventional single rice monoculture（RM） systems. The samples were subjected to controlled incubation（ 60% field water holding capacity， 25 °C ，for 42 days） to measure N2O fluxes and soil carbonandnitrognfractios.TheresultsshowedthatteCsystemsignificantlyinfluencedNOemissons，withsoildepthlainga regulating role.Compared to RM，theRC system significantly reduced N2O emisions from the surface soil by 37% ，whilesignificantly increasing N2O emissions from the subsurface soil by 149% （ P<0.05 ）.In addition，N2O emissions in the RC system were mainly concentrated in 21-40 d（49 % -73%），whereas in theRM system N2O emissions peaked in 4-21 1（66%-77% ）.Regarding soil properties， comparedtoRMthRCstemsigficantlycreasedtepHtotalcarbon（C），totalitroenT），lganicarbo（SO）a nitrogen（NH-N），anddisovedrgancarbon（DOC）inthesurfacesoil，hileeducingavailablephosphorus（AP），atioofCt （TCTN），nitraterg（NO）dssedrg（D）Ibufesil，eRCigntlyced，， TC，TN，NH4-，nd/atitredcedS，NOO，O，nlrcaldctiityEC）.aso redundancyaalyseealedatssisereposiivelyoraedwiAndC/N，ndgailyoeldwih andEC.Incoclusio，teloiccrafshoulesstesigiiantlyectsNOsiosinfluvoqceslsihol depth servingasaregulatoryfactor.Soilfactors suchasAP，TC/TNratio，andECarecrucial inregulatingN2Oemissions.
eywords：rice-crayfish farmingsystem; N2O ；soil depth;paddy soil; fluvo-aquic soil
氧化亚氮（ N20 ）作为一种重要的温室气体，给全球气候与环境带来极为严峻的挑战，根据IPCC报告，农业生产是 N2O 的主要排放源，其排放量占总排放量的 60%[1] 。（剩余18973字）
