不同铁氧化物对土壤镉有效性及水稻累积镉的影响的开题报告摘要：镉是一种重金属污染物，长期在土壤中积累会导致农产品中镉含量过高，严重影响人类健康。本研究旨在探讨不同铁氧化物（Fe3O4和FeOOH）对土壤镉有效性及水稻累积镉的影响。实验设置3个处理组，分别为对照组（CK）、Fe3O4处理组和FeOOH处理组。实验结果表明：Fe3O4和FeOOH对土壤Cd有效性均有一定程度的降低作用，其中FeOOH处理组的土壤Cd有效性显著降低（P<0.05）。在水稻镉累积方面，Fe3O4和FeOOH均可显著降低水稻茎秆和根中镉含量（P<0.05），其中FeOOH处理组的降低效果更为显著。不同铁氧化物对土壤镉有效性和水稻累积镉影响的机理值得进一步深入研究。关键词：铁氧化物；土壤镉有效性；水稻累积镉；Fe3O4；FeOOHAbstract:Cadmiumisaheavymetalpollutantthatcanaccumulateinsoilforalongtimeandleadtoexcessivecadmiumlevelsinagriculturalproducts,seriouslyaffectinghumanhealth.Thisstudyaimedtoinvestigatetheeffectsofdifferentironoxides(Fe3O4andFeOOH)onsoilcadmiumavailabilityandricecadmiumaccumulation.Threetreatmentgroupsweresetup,includingacontrolgroup(CK),aFe3O4treatmentgroupandaFeOOHtreatmentgroup.TheresultsshowedthatbothFe3O4andFeOOHhadcertainreducingeffectsonsoilCdavailability,amongwhichFeOOHtreatmentgrouphadasignificantlylowersoilCdavailability(P<0.05).Intermsofricecadmiumaccumulation,bothFe3O4andFeOOHsignificantlyreducedthecadmiumcontentinthestemsandrootsofrice(P<0.05),andthereductioneffectinFeOOHtreatmentgroupwasmoresignificant.Themechanismoftheeffectsofdifferentironoxidesonthesoilcadmiumavailabilityandricecadmiumaccumulationdeservesfurtherresearch.Keywords:ironoxide;soilcadmiumavailability;ricecadmiumaccumulation;Fe3O4;FeOOH