摘要
在水淹缺氧环境下,界面微环境中水稻土铁矿物的还原以及根表铁膜的生成是引起砷释放还原和促进砷被吸附的过程,识别铁对砷的作用机制是有效降低水稻对土壤砷吸收的方法。本文综述了水稻土中铁对砷的作用机制的国内外研究现状,并从水稻通气组织、土壤溶液氧化还原电位、铁矿物类型、有机质和阴离子种类等5个方面讨论水稻土中铁对砷的化学行为的影响,并展望了今后的研究方向,以期为水稻土砷污染防治及抑制水稻对砷的吸收提供参考。
Under flooded and anoxic condition, reduction of iron minerals in paddy soil and formation of iron plague on root surface in interface microenvironment cause arsenic to release and contribute to arsenic absorption. Characterizing mechanisms of how iron affect arsenic is an effective method for reducing absorption of soil arsenic into rice. This paper reviewed the advances at home and abroad in iron＇s effects on arsenic. The effects are discussed from five aspects, including rice aerenchyma, redox potential of soil solution, species of iron mineral, organic matter and species of anions, and research prospects are also discussed in order to provide references for remediation of arsenic contamination in paddy soil and inhibition of arsenic absorption into rice.
出处
《土壤》
CAS
CSCD
北大核心
2016年第5期854-862,共9页
Soils
基金
广东省科技计划项目(2013B020700010)
广东省教育部产学研结合项目(2012B091000152)
公益性科研所基本科研业务专项(pm-zx021-201410-023)
广州市科技计划项目(201607010393
2016201604030017)资助
关键词
砷
铁
水稻土
氧化还原
界面微环境
Arsenic
Iron
Paddy soil
Redox
Interface microenvironment
