EDTA作用下芥菜型油菜对土壤中Cd·Ni的富集规律

Enrichment Rules of Heavy Metals Cd and Ni in Brassica juncea Treated with EDTA

通过盆栽试验,研究了不同生长期的芥菜型油菜在EDTA作用下对Cd、Ni的富集规律。结果表明:随着生长期的延长,EDTA处理的油菜地上部和根部中Cd、Ni的浓度极显著地高于对照组,且EDTA对Cd迁移的影响明显强于Ni,说明EDTA有助于强化芥菜型油菜对Cd污染土壤的修复作用;对28～63天的6个不同生长期的分析表明,生长49天时2种处理的油菜地上部中总Cd含量均占整个生长期的90%以上,总Ni含量为整个生长期的80%以上,此时收割比较合适。

Pot experiment was conducted to study the enrichment rules of heavy metals Cd and Ni in different growth periods of Brassicajuncea treated with EDTA. The results showed that with the growth of Brassicajuncea treated with EDTA, the concentration of Cd and Ni was higher than the control group. It was indicated that the transfer effect could be improved by EDTA. After analyzing the 6 different growth periods from 28 d to 63 d, the total Cd content in 49 d in the shoot of Brassicajuncea accounted for more than 90 % of the whole growth periods, and Ni content was above 80 %. Therefore, 49 d was the appropriate time to harvest Brassicajuncea.