不同品种小白菜对镉的吸收积累差异

通过盆栽试验，研究了60个小白菜品种在不同程度镉污染土壤中吸收和积累镉能力的差异.结果表明：在土壤镉浓度为0.6 mg·kg^-1时，小白菜镉含量超过国家标准的为8.33％；而在土壤镉浓度为1.2 mg·kg^-1时其超标率达66.67%，表明小白菜容易受到镉污染.2种镉浓度下白菜地上部分镉含量均低于国家食用标准，且其生物量不受影响的小白菜品种为：长梗白菜、上海青、矮箕苏州青、青优四号、矮脚葵翩黑叶白菜、皱叶黑油冬儿、高华青梗白菜、早生华京、金冠清江白、夏王青梗菜、利丰青梗白菜和杭州油冬儿.这12个品种可作为在镉轻度污染土壤中种植的安全系数较高的小白菜品种.

Differences in cadmium absorption and accumulation of Brassica varieties on cadmium-polluted soil.

A pot experiment was conducted to study the differences in cadmium (Cd ) absorption and accumulation of sixty Brassica varieties on the soils added with different concentration of Cd. The results showed that when the soil Cd co ncentration was 06 mg·kg-1 and 12 mg·kg-1, the percentage of t est Brassica varieties whose Cd content exceeded the National Edible Standar d was 833% and 6667%, respectively, suggesting that Brassica was easy to be Cd-polluted. The shoot Cd content of all test varieties was below the National Edible Standard, and the biomass of the varieties Changgengbaicai,Shanghaiqing,Aijisuzhouqing,Qingyou 4,Aijiaokuipianheiyebaicai,Zhouyeheiyoudonger,Gaohuaqinggengbaicai,Zaoshenghuajing,Jinguanqingjiangbai,Xiawangqinggengcai, Lifengqinggengbaicai, and Hangzhouyoudonger was not affected. These 12 Brassica varieties could be planted on the soils with light Cd pollution.