Interaction of Pb and Cd in soil-water-plant system and its mechanism: I. Pb-Cd interaction in red soil-plant system.

摘要

The effect of Pb-Cd interaction on plant growth and on the chemistry of elements in plants was studied under greenhouse conditions using a red soil-wetland rice system in different growth stages. This showed that Pb-Cd interactions on plant growth and metal uptake varied with different growth stages and chemical compounds added. Plant height and root weight were markedly affected by Pb-Cd interaction in the young stage but not in the ripening stage of rice at the treatments of PbCl2 added. However,the weight of rice straw in the ripening stage was significantly affected by Pb-Cd interaction with the treatments of Pb(OAc)2 and CdCl2. The chemistry of elements in plants also depended on Pb-Cd interaction, varying with different plant parts and growth stages. Pb-Cd interaction probably occurred both in the roots and in other parts of wetland rice.