螯合剂对Cd在土壤、紫花苜蓿中积累的影响研究

In order to investigate the effects of agents at levels of 0.01-15 mmol/kg on Cd accumulated in alfalfa by experiments pot and various forms scales of Cd in soils by static adsorption .Results showed that : the more agents in soils the higher percentage of water-soluble Cd and reach climax at level of 15 mmol/kg on EDTA. Percentage of exchangeable Cd is increasing with higher concentration agents added in soils but without distinct difference. Gallic acid（GA）、EDTA mobilize Cd effectively、similarly at level of 5 mmol/kg and GA is more suit for mobilizing Cd in soils than EDTA。（2）Agents at levels 0-1mmol/kg, accumulated of Cd in root、leaf greatly increased. The effects from three agents in promoting accumulation of Cd in root : EDTA> GA> Citric (CA), the effects of three agents in promoting accumulation of Cd in stem: EDTA> GA> CA. The promoting effects on accumulation of Cd in leaves : GA > EDTA > CA.（3）In generally, transformation rate of Cd in Alfalfa is rising when concentration of CA、GA increase ,and GA has higher values compared with CA。