聚天冬氨酸对土壤镉有效性及其吸附解吸特性的影响
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关键词：聚天冬氨酸；镉生物有效性；吸附-解吸；土壤修复中图分类号：X53 文献标志码：A 文章编号：1672-2043（2026）01-0094-11 doi：10.11654/jaes.2025-0631
Effects of polyasparticacid oncadmiumavailabilityand adsorption-desorption behavior in Cd-gradient soils LI Yanmei¹²， WANG Wei，LINXiaobing³，LIUChangzhengl，LIUShiyul*，XUZhentang2，ZHANGQin1，HUBenliu²
（1.CollgeofLandResourceandEnvironent，KeyLaboratoryofAgriculturalResourcesandEcologyinPoyangLakeWateedof MinistryofAgricultureandRuralAfairsinChina，JiangxiAgriculturalUniversityNanchang33O45，China;2.JiangxiHuagan Enviromentalcholog&Dod.acng6，ina;3atioalRedSlIproventEgineringl Center，Jiangxi Institute of Red Soil and Germplasm Resources，Nanchang 331717，China）
Abstract：Toinvestigatetheregulatorymechanismof polyasparticacid（PASP）oncadmiumbioavailabilityincontaminatedsoils，andto determineitsoptimaloperatioalconditionsandtheresponsepatesundrvaryingcadmumconcentrationgradients.Inthisstudytwo typicalCd-cotaminatedgricultualsoilsereivestigatedusigBCRsquentialxtractionatchdsotionsotioits and kinetic modeling to assess the effects of PASP（molecular weight： 4 000-5 000 Da）on Cd speciation and adsorption-desorption behavior. The results demonstrated that the addition of PASP at 10mg⋅kg-1 significantly increased the content of bioavailable Cd（ P <0.05） byfacilitatingthetransforationoflssactieCdfractiosintoteacid-solublefo，witoutinducingsigfcantchangesisoilpH. FreundlichisotralsisveaedtatASPducedteCddsotioapacityftesoilreasdthsotioatedlowd thehysteresisinexcolielyidatigthatASPibitsCddsoandprootesitssotioAccdingtoeEichodel Cd adsorption proceeded through three distinct phases：rapid（O-1 h），slow（1-10 h），and equilibrium（ >10 h）. The most effective Cd activation occurred at pH6 and temperatures between 15-25C ，withbackground Cd levels exerting minimal influence.This study offers theoretical insights essential foradvancing PASP-enhanced phytoremediation strategies for Cd-contaminated soils.
Keywords：polyaspartic acid（PASP）;cadmium bioavailability; adsorptionand desorption; soil remediation
研究表明，镉（Cd）是一种植物生长非必需且具有强迁移性、高生物毒性和难生物降解性的重金属元素，已成为导致全球作物减产和品质下降的主要环境因子之一。（剩余20958字）
