生物炭对硒镐高背景区域稻田富硒水稻生产的影响

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中图分类号：S156.99 文献标识码：A DOI编码：10.3969/j.issn.1006—6500.2025.08.012

Abstract：Inorder toexploretheefectofbiocharontheproductionofselenu-enrichedriceandtheunderlying mechanisms npaddyfieldswithhighlevelsofbackgroundseleniumandcadmium，thisstudyanalyzedriceyield，aswellastheselenmandcdmium contentofrice，underdifrentlevelsofiocharapplication.Changesintephysicochemicalpropertiesofpddysoil，theactiveele niumandcadmiumcontentofsoil，andthemorphologyofseleniumandcadmiumwerealsoexamiedthroughafeldplotexperiment. Theresults showed that applying biochar at level BC2 significantly increased theyieldof rice by 6.2% ，while increasing the selenium contentofbrowiceanddecreasing theadmumcontent.BiocharaplicationincreasedsoilpH，organicmaercontent，quick-actingphosporusandcationexchangecapacityinlinewithincreasedbiomassadition.Biocharapplicationincreasedthecontentofsoil seleniuminitsefectivestatewhiledecreasingthecontentofsoilcadmiuminitsefectivestate.TheBC3treatmentincreasedthecontentof soil selenium in its effective state by 118.3% anddecreased the content of soil cadmiumin itseffective state by 20.2% ： Biochar application increased the proportion of soil water ⋅- soluble and exchangeable selenium，while decreasing the proportion of soil Fe/Mnoxideound，andoanicaeround，swellassidalselenm.egreatestectasbsedonwatebled exchangeable selenium，with coefficientsof variation between treatments of 21.4% and 34.0% .Biochar application could transform soilcadmiumforsintooxidisableandresidualstates.Insummaryapplyinganappropriateamountofbiocharcansignificantlyncreaserice yieldandachievethegoalsofriceselenium enrichmentandcadmiumreduction.BC2isthemost efectivetreatmentfor producing selenium-enriched， safe rice inselenium-contaminated farmland.

KeyWords： biochar;rice;selenium-enriched and high-cadmium soil; selenium speciation;cadmium speciation

硒是人体必需微量营养元素，具有抗氧化、提高生理抗逆性等作用。（剩余9428字）