首页|FeSO4对水稻根表铁膜及污染稻田土中镉迁移转运影响研究

FeSO4对水稻根表铁膜及污染稻田土中镉迁移转运影响研究

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选取湖南某污染稻田耕作层土壤,通过盆栽实验外源施加硫酸亚铁(FeSO4),研究FeSO4 对水稻根表铁膜及污染稻田土中镉(Cd)迁移转运的影响.结果表明,随着FeSO4 施加量增加(0~320 mg/kg),水稻根际土壤pH值呈下降趋势,最高下降了0.70;水稻盆栽土壤TCLP-Cd含量与对照组相比出现一定程度上升;施加FeSO4,降低了水稻茎叶、谷壳、糙米中Cd含量,增加了水稻植株根表铁膜的数量,一定程度上控制了水稻对土壤中Cd的吸收.但施加外源铁影响了土壤pH值及Cd的生物有效性,在实际稻田施加FeSO4 时建议与石灰等其他碱性修复材料进行组配,以获得更好的阻控效果.
Effects of FeSO4 on Root Iron Plaque and Migration and Transportation of Cd in Contaminated Paddy Soil
A kind of contaminated paddy soil was taken for pot experiment by adding FeSO4 to investigate the impact of FeSO4 on the formation of iron plaques on the root surface and the migration of the Cd from Cd-contaminated paddy soil.Results show that with the addition of FeSO4 increased from 0 to 320 mg/kg,the pH value of the paddy soil tends to decline,maximally by 0.70.The TCLP-Cd content in the potting soil rises to a certain extent compared to the control group.The addition of FeSO4 significantly reduces the Cd content in leaves,husks,and brown rice,as well as effectively increases the amount of root iron plaque,thus the absorption of Cd in the soil by rice is moderately controlled.However,the addition of external iron resource can bring impact to the pH of soil and bioavailability of Cd,so it is recommended that in practical operation,FeSO4 should be added with some alkaline restorative materials such as lime to contaminated paddy fields for enhancing the control.

contaminated soilheavy metal pollutionsoil restorationriceCdexternal iron resourceroot iron plaquebioavailability

李威、谢悦、石竹、陈立伟

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长沙环境保护职业技术学院,湖南 长沙 410003

湖南省生态环境事务中心,湖南 长沙 410003

污染土壤 重金属污染 土壤修复 水稻 外源铁 根表铁膜 生物有效性

湖南省环境保护科研项目湖南省教育厅科研项目湖南省自然科学基金

HBKT-202201621C1584211109415018

2024

矿冶工程
长沙矿冶研究院有限责任公司 中国金属学会

矿冶工程

CSTPCD北大核心
影响因子:1.137
ISSN:0253-6099
年,卷(期):2024.44(2)
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