不同恢复期湿地土壤重金属残留分析与生态风险评价

打开文本图片集

中图分类号：S714.5 文献标志码：A

Abstract：【Objective】Thestudyims toasesstheresidual levelsandpotentialecolgicalrsksofavymetals-Zn，PbAs，Cr Cu，Hg，andCd-inesoilofrudfddsiintoliatioalateseeissssmtseestoproide referencedataforwetlandrestorationandprotectionefrtswithintheresere.【Method】Atotalof57soilsampleswerecollectedfrom Daxing farm，Hongqiling farm， ⋅853∘ farm， and ⋅597， farm，each representing different reforestation periodswithin the Naolihe reserve basin.Thesoilsampleswereprocesedusingamixedacid-electrothermalplatedigestionmethod.Thestudyanalyzed thedierences inresidualeaetsacosretuplotsfroear（R1），year（2）-ear（8）ar（17）swells

（SF），rice （RF），and natural wetland （NW） plots.The single factor pollution index （P） ，geological accumulation index （Ige0） ，and potential ecological risk index （RI） were employed toevaluate the potential ecological risk levelsofheavy metals in the soil.【Result】The residual concentrations of Zn ，Pb，As， Cr cu Hg，andCd in theNaolihereserve soil ranged from 0.39-0.98，0.21-0.35，0.63-2.85，1.54- 2.34，1.77-3.88，0.74-2.24， and 0.12-0.54mg⋅kg-1 ，respectively.Theresidual concentrations of Zn ，Pb，As，Cr，andCu wereall below the soil background values for the Sanjiang plain，whereas Hg and Cd levels exceeded these background values.The evaluation results using the single factor pollution index indicated that cu Cr， Zn As，and Pb were pollution-free across all locations.Hg pollution was moderate tosevereinR1，R2，R8，andfarmlandplots（CF，SF，RF），wileitwasmildinR17andNWplots.Cdshowedmildcontaintioin Rlandfarmlandplots，withoterplotsremainingatcleanlevels.ThegeologicalacumulationindexevaluationrevealedthatCd， Zn，Pb，As，Cr，and Cu were pollution-free inall locations，while Hg exhibited light to moderatepollution.The potential ecological hazardindexevauationidicatedthatR1，R2，andfarlandplotsposedmediumsks，whileR8，R17，andNWplotsposedlowisks. 【Conclusion】uallevesofyetalsecreadprgeselyitogereforestatiopodAfter7yearsofatio theresiduallelsetowstdompabletooturaleadoloiaisoatedietalsse reclaimedwetlandsoilsofteNoliereseengedfrolowtomedPotsretudtofandforand7yearsereclaifdaslowrisk.Heavymetals HgandCdarethe main ecologicalhazardelements intheretumed farmland wetlandoftheNaolihereserve. Keywords：Naolihenaturereserve;return farmlandtowetlands;soilheavymetals;ecologicalrisk;evaluationindex

湿地是重要的水陆过滤系统，具有蓄洪抗旱、涵养水源、净化水质、调节气候、维持生态平衡等重要作用[1，具有不可替代的生态功能。（剩余15651字）