柠檬酸强化籽粒苋修复镉污染土壤效果研究

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中图分类号：S156 文献标志码：A 文章编号：1008-0864（2025）09-0215-09

EffectsofCitricAcidonEnhancetheRemediationof Cd-contaminated Soil by Amaranthus hypochondriacus L.

ZHOUJunyu1，GUYul，WUHaiyong'，LIMingde'，LIUQiongfeng1， ZHOU Xuan1，DONG Chunhua1，2* （1.，Changsha41O125，；2.HunanNew TypeFertilizerEngineeringand Technological ResearchCenter，HunanSoil and Fertilizer Institute，Changsha41O125，）

Abstract：Inorder to explore theeffect of exogenous citric acid additionon theremediationof cadmium（Cd） contaminated soilby Amaranthus hypochondriacus L.，2Cd contaminated soils with moderate（M）andlow（L）were selected and treatedwith4citricacid dosageof2.5（T1），5.0（T2），10.0（T3），20.0 mmol·kg-1（T4） to study the responseof phytoremediation characteristics of A. hypochondriacusL.tocitricacid application with no citric acid adedascontrol（CK）.The results showed that exogenousadditionof citricacidto moderate and lowCd contaminated soil reduced soil pH to a certain extent，promoted the conversion of Cd components in soil and improved the biological availabilityofCdinsoil.Theapplicationofcitricacidinlow Cd-contaminated soil significantlyincreasedtheabove-ground Cdcontentbutdidnotaffectthenormal growth，andsignificantly increased the above-groundCd remediation eficiency，which increased with the increaseof citricacid dosage，ranging from 58.58% to 213.20% ，among them，L-T4 treatment had the best effect，and the aboveground Cd removal rate 0 （18.98% ）was significantly higher than other treatment. Although the above-ground Cd content in moderately Cdpoluted soil afterapplicationof citricacidshowedanincreasing trend，theabove-groundCdremoval ratewasnot significantlychangedby exogenousapplicationofcitricacidbecauseexcessiveenrichmentofCdinhibitedits normal growth.In conclusion，applying 2O mmol·kg-1 citric acid could effectively improve the remediation efficiency of A ： hypochondriacus L.inlowCdpollutedsoilbyreducingpH，increasingCdbioavailability，Cdremovalrateandsoon. However，there was no need to apply citric acid when A.hypochondriacus L.was used to repair moderate Cd contaminated soil.Therefore，the exogenousadditionofcitricacidcould enhance theAmaranthushypochondriacus L remediation of Cd-pollted soil toacertain extent.Above results provided important reference valueand guiding significance forthe treatment ofmoderateandlow Cd contaminated farmland.

Keywords：Cd-contaminated soil;phytoremediation; Amaranthus hypochondriacus L.；citricacid;Cd components

土壤镉（Cd）污染已成为制约中国粮食安全和耕地质量的关键环境问题之一。（剩余14479字）