砷镉复合污染稻田修复研究进展

我国农田土壤重金属污染严重,其中稻田土壤砷镉(As/Cd)复合污染形势严峻。相较于其他粮食作物,水稻具有更强的积累As/Cd能力,稻米中As/Cd通过食物链进入人体会对人类健康带来危害。因此,修复As/Cd复合污染稻田土壤,降低稻米As/Cd含量,对保障我国粮食安全生产意义重大。本文综述农田As/Cd复合污染现状及危害,讨论了As/Cd有效性影响因素及水稻中As/Cd吸收转运机制,详细探讨了稻田中As/Cd污染的修复方法。最后针对目前修复技术提出存在的不足和展望,以期为As/Cd复合污染稻田土壤修复提供一定的指导。

Research progress on remediation of cadmium and arsenic compound contaminated paddy soil

In China, heavy metal pollution in agricultural soils is very serious, especially arsenic and cadmium (As/Cd) co-contamination in paddy soil. Compared with other food crops, rice has a stronger ability to accumulate As/Cd, and As/Cd in rice enters human body through the food chain and causes harm to human health. Therefore, it is of great significance to repair As/Cd compound contaminated paddy soil and reduce rice As/Cd content to ensure the safety of food production. In this paper, a review is presented to show the current situation and harm of As/Cd co-contamination in farmland, the influencing factors of As/Cd effectiveness and the absorption and transport mechanism of As/Cd in rice were discussed, and then discussed the remediation methods of As/Cd pollution in paddy fields in detail. Finally, the shortcomings and prospects of the current restoration technology are proposed to provide some guidance for the remediation of As/Cd compound contaminated paddy soil.