西藏林周县农用地土壤重金属分布及生态风险评价

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关键词：林周县；高海拔农业区；农用地；重金属；分布特征；风险评价 中图分类号：X53；X826 文献标志码：A 文章编号：1672-2043（2025）10-2579-11 doi：10.11654/jaes.2024-0973

Abstract：Toinvestigatetheheterogeneousmechanismsofheavymetalmigrationandaccumulationinhigh-alitudeagriculturalsoils underniqueeoenvironmentalconditions，atotalof43soilsampleswerecolltedfromagriculurallands insouthernLinzouCounty. Eightheavy metalssenic（As），admium（Cd），hromiu（Cr），coppe（Cu），adPb），inc（Zn），ickel（Ni），dmercuryHe analyzedforthironcenratiosIntegratedwitgostatistcalaalysistoharacterizespatialdtrbutionpaes，tenviotal qualitywascomprehensivelyaessedusingsinglefactorindex，Nemerowcompositeindex，geoaccumulationindex，andotential ecologicalriskindexmetodlogies.Furthemre，ominedaplicationoforelatinaalysisndprincipalomponentaalysis（CA） wasconductedtodentifyprdoiantctaiatiosuces.esultsevaledtatteerageonentratiosofAs，Cd，CCuHg Ni，Pb，and Zn were 21.1， 0.170，58.4，24.5，0.076，26.0， 31.1 mg·kg-1 and 79.2mg⋅kg-1 ，respectively.All these values were below the screeningvaluesestablishdbytheSoilEnvironmentalQualityRiskControlStandardforSoilContaminationofAgrculturalLand（GB 15618—2018）.Whencomparedtootherhigh-altituderegions，suchastheeasterTibetanPlateauLinzhouCountyexhibitedhigher levelsfCdandHg，ikelyduetoguluralpracticesandtraffcelatedplutionInontrast，CrandNiconcentratioserepraily controledbyearetateralndeirsatialdstrbutionatessebledoeeedinotrgiosofteealateau Univariateindex methodevaluations indicatedthatCdandHgexhibited higherpolutionindices，withcertainsamplingpointsshowing potentialcoloicalisseaveageHakasonpotentialcolgicaliskidexinthsudyreas742，suggestinglowoloical risk，thoughsomepontsinicatedmoderatetoighss.As，Cd，bndZareprimarilyrvedfrotraficsourcs.Cdiae primarily controlled by background materials. Hg isprimarily influenced by the concentrated combustion of fossil fuels and biofuels， whereas Cuispredominantlyderivedfromtransportationsourcesandisalsoinfluencedbytheparent materialof thesoil.

KeywordsLinoonty;gidialeaulualnd;aals;strbuiacteistist

土壤作为人类赖以生存和发展的基础性自然资源，其生态安全至关重要。（剩余19102字）