中文关键词砷镉FZB复合改良剂小白菜生物有效性 英文关键词arseniccadmiumcompound modifier FZBChinese brassicabioavailability

作者	单位	E-mail
丁萍	四川大学建筑与环境学院, 成都 610065 四川大学新能源与低碳技术研究院, 成都 610065	646744802@qq.com
贺玉龙	四川大学建筑与环境学院, 成都 610065 四川大学新能源与低碳技术研究院, 成都 610065
何欢	四川大学建筑与环境学院, 成都 610065 四川大学新能源与低碳技术研究院, 成都 610065
余江	四川大学建筑与环境学院, 成都 610065 四川大学新能源与低碳技术研究院, 成都 610065 四川大学宜宾产业技术研究院, 宜宾 644000	yuj@scu.edu.cn

中文摘要 通过小白菜盆栽种植试验，研究了复合改良剂FZB（硫酸铁+沸石+改性生物炭）在不同施加量条件下对土壤基本理化性质、As和Cd的生物有效性和赋存形态，以及小白菜累积转运As和Cd的影响.结果表明，在砷镉复合污染农田土壤中，施用复合改良剂FZB后，小白菜根际土壤pH、有机质含量和阳离子交换量均呈现上升趋势；土壤中有效态As和有效态Cd含量随FZB施用量的增加而逐渐降低，最大降幅分别为65.99%和30.68%；FZB的施用使土壤中重金属赋存形态发生明显改变，其中交换态As和交换态Cd含量降低，铝结合态As、铁结合态As、有机结合态Cd和残渣态Cd含量却有所增加；同时，施用FZB还可有效降低小白菜根部和地上部中As和Cd的含量，在8 g·kg^-1施用量水平，与对照组相比，小白菜地上部分As、Cd含量均降低到最小值，下降幅度分别为42.09%和31.34%；FZB的施用减少了小白菜根部和地上部分对As和Cd的富集，并且降低了小白菜植株将As从根部转运到地上部的能力.本研究表明，在降低农田土壤As、Cd生物有效性方面，复合改良剂FZB具有良好的应用前景. 英文摘要 A pot-based planting experiment of Chinese brassica was carried out to study the influence of the compound modifier FZB (iron sulfate+zeolite+modified biochar) on the physical and chemical properties of soil, As and Cd bioavailability and morphology, and the ability of Chinese brassica to accumulate As and Cd at different dosages. The results showed that, after application of FZB, the pH, OM, and CEC contents of the rhizosphere soil tended to increase in As and Cd compound contaminated farmland soils. The concentrations of available As and available Cd in the soil gradually reduced with an increase in FZB application, with maximum reductions of 65.99% and 30.68%, respectively. The application of FZB significantly changed the morphology of heavy metals in the soil, which consequently decreased the exchangeable concentrations of As and Cd, while the concentrations of aluminum-bound As, iron-bound As, organic bound Cd, and residual Cd increased. At the same time, the application of FZB effectively reduced the concentrations of As and Cd in the roots and aerial parts of Chinese brassica. When 8 g·kg^-1 of FZB was applied, compared with the control group, the concentrations of As and Cd in the aerial parts of Chinese brassica were reduced by 42.09% and 31.34%, respectively. FZB application decreased the As and Cd bioaccumulation capacity of the roots and aerial parts, and decreased the capacity of the plant to translocate As from the roots to the aerial parts. The study shows that the composite modifier FZB has good application prospects for reducing the bioavailability of As and Cd in farmland soils.

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