修复剂对烟草吸收污染土壤中砷的改良

采用盆栽试验,研究3种修复剂对减少烟草吸收土壤重金属As之改良效果。烟草生长在As含量为25mg/kg的污染植烟土壤上,通过添加3种土壤修复剂,测定烟草在不同生长时期不同部位的生物量及重金属As含量。结果表明:烟草体内As含量的分布为根>叶>茎,烟草由根部向地上部运转As能力不强;烟草体内不同部位在不同的生长时期As的含量也发生变化;3种修复剂均在不同程度上减少了烟草不同部位重金属As的含量,同时也改变了烟草中As的根吸收系数、初级转移系数和次级转移系数,增加了烟草的生物量,达到了提高烟草安全性和品质的目的。

Effect of Remediators on As Uptake by Tobacco in Contaminated Soil

Pot experiments were carried out to study effects of different soil remediators on tobacco growth and reduction of As contents in tobacco. Tobacco plants were planted in pots of As-contaminated soil, 25 mg/kg in As concentration. After three different soil remediators were applied separately, As contents and biomass of different parts of the plants during different growth periods were investigated. The results showed that As distribution in the plants was the order of roots>leaves>stems. The ability of the plant to transfer As from roots to stems and leaves was not strong. As contents in different parts of the plants varied with the growth period. The three soil remediators reduced As contents in different parts of the plant to a varying degree. Meanwhile, they also changed root adsoption coefficient, primary transport coefficient and secondary transport coefficient of As in tobacco, and increased biomass of the plants. Bone meal, activated carbon and attapulgite are good soil remediators that may improve tobacco quality and yield.