铁-生物炭基生态沟渠净化农田退水及增强 N2O 汇的机制
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关键词：海绵铁；生物炭；生态沟渠；反硝化；净 N2O 汇；狐尾藻 中图分类号：X52 文献标志码：A 文章编号：1672-2043（2025）08-2043-14 doi：10.11654/jaes.2025-0304
Mechanism of iron-biochar-based ecological ditches purifying farmland waterand enhancing N2O sinks
YANGYijing，JANGBini，ZHANGYingying，WANGYan，ZHANGZhiyong2，IUHaiqin'，LDan，HEXiwei，YANGYl （1.InstituteofriculturalResouesandEnvroentalSiences，JangsucadeyofgriculturalSinces;KeyLboratoryofgo EnvironmentinDownstreamofYangtePlain，MinistryofAgricultureandRuralAfirs;LiuheObservationndExperimentalStationof NationalAgruralot，ji;.ofteot，jnalUsi China）
Abstract：InodertoexploetenitrogenremovalfectandNOissonofspongeion-Myriophllumiro-M）verticillatderived biochar-basedologcalditchinthceoffarlandwateringforduderstoconditios.Inthissudysixpilotaleo. algaederivedbiochar-basedecologicalditchsimulationsystemswereconstructedtoexploretheefectsofspongeironcoupledwith powderedandgranularbiochar-basedecologicalditchesonnitrogenremovalandNOsinkfunctionoffarmlandwithdiferentcarbon nitrogenratios.Theresultsshowedthatcomparedwiththeiron-freebiocharecologicalditch（CK），theadditionofspongeironbiochar couldimprovetheremovalrateoftotalnitrogen（T）.Amongthem，powderedcarboncouldsignificantlynhancetheNO-Nsinkofthe systemand transform theditchfromanatmospheric NOemisionsource toanetabsorptionsink.Whenthechemicaloxygendemand （COD）TN=30/5，theTremovalrateofthespongeiron-powderbiocharbasedeologicalditchwasashighas4006%，andthe NO-N absorption rate was 2.59μg⋅m-2⋅h-1 ，which was significantly higher than that of the ecological ditch without adding and adding sponge iron-particle biochar.The NO N removal rate in the ecological ditcheswas the main contributor to the TN removal rate，and the N2O emissiofluxassignificantlyegativelycorrelatedwiththediolvedorgaiccarbonconcentration，CODandtotalorganicarbon（OC） removalate.TheTNabsorbedbythetwoaquaticplantsfurtherexplainedthebiologicaldrivingmechanismofsimultaneousenhancement fdenitrificatioandNOsikiniropowderiocarbasedeologicaldichs.heesultssowedtatteon-M.verticilltadie powderbiochar-basedecologicalditchhadagoodefectonthetreatmentoffarmlanddrainageformedbyrainstormconditionsandcould formanetN2O absorption sink together with plants.
Keywords：sponge iron;biochar; ecological ditch; denitrification; net N2O sink;Myriophyllum
随着我国农村经济的快速发展，农业面源污染日趋加剧，已成为水污染的主要来源。（剩余27158字）
