水滑石—钙镁磷肥修复镉污染稻田及调控水稻隔积累研究

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中图分类号：X53 文献标志码：B 文章编号：1004-4345（2026）01-0037-06

AbstractToachievethein-situimmobilizationremediationofCd-contaminatedfarmland，afieldplotexperimentwasconducted inatypicallightlyCd-contaminatedacidicpaddyfiledinHunanProvince.Thestudyinvestigatedtheefectsofthesingleand combinedapplicationofCaAl-LDHandCMPonCdabsorption，bioaccumulationnd ranslocationinrice.Atotalofninetreatments wereestablished.SoilpH，availablephosphorus，availableCdcotent，andCdfractiondistributionwereetermiedTheCdctents inriceroots，emsas，andgainsrealyd，ndtheoaclationtfactorandadtraslocatiocofentwerelated TheresultsshowedthatbothsingleandcombinedapplicationsofthetwomaterialsincreasedsoilpHandreducedtheavailableCd content in soil. The overall Cd immobilization efficiency followed the trend： L2C2>L2C1>L2>L1C2>L1C1>L1>C2>C1> CK，with CaAl-LDHexhibitingabeterCdimmobizationeffectthanCMP.AlltreatmentssignificantlyreducedCdcontentand accumulation in rice roots，stems/leaves，and grains，demonstrating a clear dose dependent effect. The application of the materials significantlydecreasedtheCdbioaccumulationfactorforicegrainsandrootsbutshowednosignificantefectonthebioacculation factorforstems/leaves.Furthermore，itrducedtheCdtransloationfactorfromrotstogainswhileincreasingthetranslocationfrom roots to stems/leaves.Considering both Cd reduction eficiencyand economic benefits，thecombined application of at 0.75kg/hm2 and CMP at 0.75kg/hm2 isrecommended.This combination effctively reducesthe bioavailabilityofCd insoilandthe Cd content in rice grains in lightly contaminated acidic paddy fields.

Keywords CaAl-LDH; CMP fertilizer; Cd contamination; in-situ immobilization remediation; rice

土壤是人类生存和农业发展的基础，但近年来，金属冶炼废液排放、化学农药滥用及采矿等活动导致土壤重金属污染问题日益严重[1-3]。（剩余9636字）