土壤中镉的赋存形态及生物有效性研究  

Studies on the Geometrical Shape and Bioavailability of Soil Cadmium

作　　者：翟琨[1] 

机构地区：[1]生物资源保护与利用湖北省重点实验室/湖北民族学院化学与环境工程学院,湖北恩施445000

出　　处：《吉林农业科学》2015年第2期49-52,共4页Journal of　Jilin Agricultural Sciences

基　　金：湖北省教育厅重点科研项目(D20131905;D20131906);生物资源保护与利用湖北省重点实验室开放基金(PKLHB1316);湖北民族学院团队项目(MY2013T003)

摘　　要：为研究镉在土壤-植物系统中的赋存形态和生物有效性,以棕壤为供试土壤,添加1、3、8、15、30mg·kg-1等5个不同浓度的外源镉,测定不同浓度和不同处理时间下土壤中镉的存在形态及质量分数。结果表明随外源镉处理浓度的升高,土壤中碳酸盐结合态和有机结合态的镉向交换态、残渣态方向转化,铁锰氧化物结合态变化不大;随处理时间的延长,土壤中交换态和碳酸盐结合态的镉向残渣态、铁锰氧化物结合态和有机结合态方向转化,镉的生物有效性逐渐降低。In order to study chemical speciation and bioavailability of cadmium in the soil-plant systems, 1, 3,8, 15, 30 mg·kg- 1exogenous cadmium were dropped into the brown soil, and morphology of cadmium and qualityscores in soil were detected under different concentrations and different treatment time. The results showed that withthe increase of concentration of exogenous cadmium, carbonate and organic soil cadmium would convert into ex-change state and residual cadmium, but almost Fe-Mn oxides would not change. With the last of time, soil exchange-able and carbonate bound would change to residual cadmium, Fe-Mn oxides and organic-bound cadmium, thus bio-availability of cadmium decreased.

关 键 词：土壤-植物系统 镉 形态分布 生物有效性 

分 类 号：S153[农业科学—土壤学]