农业环境科学学报Issue(7)：1316-1321,6.DOI:10.11654/jaes.2014.07.009
水分调控和钝化剂处理对水稻土镉的钝化效应及其机理
Immobilization of Cadmium in a Paddy Soil Using Moisture Management and Amendments
摘要
Abstract
In situ immobilization is one of remediation techniques for soil heavy metals. Here a pot experiment was conducted to study the effects and mechanisms of moisture management and amendments in Cd immobilization in a paddy soil. At 0.75 mg Cd·kg-1, application of sepiolite combined with phosphate fertilizer significantly increased soil pH and reduced exchangeable Cd by 20.4%and 15.7%, carbonate bound Cd by 15.5%and 14.1%, and brown rice Cd by 52.3%and 46.0%, under continuous flooding and conventional irrigation, respective-ly, compared to the control. Under no amendments, the content of Fe(Ⅱ)in the root coating was 1.2 times higher in continuous flooding than in conventional irrigation, but Cd content in the root coating in the continuous flooding treatment was only 82.6%of that in the conven-tional irrigation treatment. Applying amendments increased Fe(Ⅱ)content in the root coating by 40.1% and 70.0%, but reduced the Cd content in the root coating by 35.3%and 42.4%under continuous flooding and conventional irrigation, respectively. Cadmium in brown rice was significantly negatively correlated with Fe(Ⅱ)in root coating, but positively with Cd in the root coating. In conclusion, the compe-tition for sorption sites in root coating between Fe2+and Cd2+and lower soil Cd bioavailability were main factors leading to lower Cd concen-trations in brown rice for the amended soils.关键词
长期淹水/常规管理/土壤/镉/钝化修复Key words
continuous flooding/conventional irrigation/paddy soil/Cd/immobilization remediation引用本文复制引用
李剑睿,徐应明,林大松,梁学峰,孙国红,孙约兵..水分调控和钝化剂处理对水稻土镉的钝化效应及其机理[J].农业环境科学学报,2014,(7):1316-1321,6.基金项目
国家自然科学基金项目（201107056）；中国农业科学院创新团队资金项目 （）
