不同品种芸薹属蔬菜吸收累积镉的差异

Cadmium Uptake and Accumulation in Vegetable species in Brassica Cruciferae

采用温室土培盆栽试验方法,研究北京地区普遍种植的18种十字花科芸薹属蔬菜在模拟镉污染土壤上吸收累积镉的特征,结果表明:在土壤镉浓度为20mg/kg时,芸薹属不同类蔬菜及同类蔬菜的不同品种之间吸收和累积镉能力存在显著差异,大白菜北京小杂55地上部镉含量最高,达61.4mg/kg,而芥蓝香港白花中只有18.6mg/kg,两者之间相差3倍以上;不同品种蔬菜地上部吸镉量和对土壤镉的富积系数也差异显著,最高吸镉量是最低吸镉量的5倍,大白菜北京小杂55的富积系数高达3.07,而芥蓝香港白花和菜薹金秋红2号只有0.93和0.97,均小于1。在镉污染的蔬菜地上选择种植低积累镉的蔬菜品种是生产符合食品安全农产品的重要措施。

Cadmium concentration were determined in eighteen vegetables of Brassica Cruciferae cultivated in greenhouse by atomic absorption spectrophotometry. The difference of cadmium uptake and accumulation are significant in the different vegetable kinds and breeds in Brassica when soil cadmium concentration is 20 mg/kg. Beijing xiaoza 55（Chinese cabbage） has the highest Shoot cadmium concentration that is 61.4 mg/kg; Hong Kong baihua＇s （Chinese kale） shoot cadmium concentration, however, is only 18.6 mg/ kg,. BAF among all the species vegetables exist significant difference. The BAF of xiaoza 55（Chinese cabbage） is high to 3.07. But that of Hong Kong baihua （Chinese kale） and jinqiuhong2 was just 0.93, 0.97 respectively. Both were less than 1. The edible part safety of vegetables will be higher if Hong Kong baihua （Chinese kale） and jinqiuhong2 are planted on the light cadmium contaminated farmland.