丘陵坡度对生态沟渠磷消纳的影响及优化策略
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中图分类号：X52 文献标志码：A 文章编号：1672-2043（2025）08-2033-10 doi：10.11654/jaes.2025-0508
Impact of hilly slope gradient on phosphorus removal in ecological ditches and optimization strategies
WUChenchen1，²，XUXuan2*，DUANJingjing²，CHENXiaofeng1，XUELihong² （1.SchoolofEnvironmentalScienceandEnginering，YangzhouUniversityangzhou2250o9，China;2.KeyLaboratoryofgr EnvironmentinDowstreamofYangtzePlainofMinistryofAgricultureandRuralAfairs，InstituteofAgriculturalResourcesand Environment，Jiangsu Academy of Agricultural Sciences，Nanjing 21oo14， China）
Abstract：TovestigatetimpactofillsloegadientoospousP）moalfiencyinologicaldihstisstudeuated Premovalmechanismsandeficienciesunderdiferentslopeconditionsthroughsimulatedditchexperimentscombinedwithfield validation.In the simulation experiment，two slope gradients （ 0∘ and 6∘ ）and two types of ditches（conventional ditches and ecological ditches）weresetTeconcetratiosfdiferentomponentsinteoverlingate（totalposhous，T;disoldtotaloshous， DTP;disledioganicposphorus，I;isolvedrgnicpospous，DOP;andparticlatephosphorus，PP）ihin24ousdth changesinthephosphorusforsintesdimentbeforeandaftertheexperimentweremonitord.Theesultsshowedthattheremoalrates ofTP，DTP，andineologicaldicheseresigcantlyighertanoseinconvetioalditchsunderothslopegradents.e 6∘ （204 slope reduced the TP removal rate in ecological ditches by 15.34% compared to 0∘ ，indicating that an increase in slope hada significant inhibitoryefectonPremoval.TheditchsystemprimarilyremovedPinwaterbyaccmulatinglabilePfractions（.g.，NaOH-P）inthe sediment.The field ditch experiment in Tangshan，Nanjing（approximately 7∘ slope planted with Acorus gramineus and volcanic rock substrate）verifidtheactualeficiencyofillecologicalditches.Te50mecologicalditchsowedanaverageTPremovalrateof 18.06% （2 and a removal load of 29.81 g⋅d-1 .This study confirmed that slope gradient is oneof the critical factors influencing Premoval performance f hillyeologicalditchesNeverthelessoptimizingditchstructure，substratematerialsandvegetationselectioncanenhancethe application potential ofecologicalditches for controling agriculturalnon-point sourcePpollution in hilly areas.
Keywords：non-point sourcepollution; phosphorus;removalalong theway;ecological ditch; hillarea;slope gradient
农业面源污染，特别是氮、磷营养元素的流失，已成为全球性的突出环境问题，是导致河流、湖泊等天然水体富营养化的主要驱动因素之一。（剩余18651字）
