摘要
小麦盆栽试验结果说明,当外源Cd为10mg·kg-1时,Zn的加入减少了Cd在小麦籽粒中的累积,表明Zn对Cd有拮抗效应;当外源Cd为100mg·kg-1时,Zn的加入促进了Cd在小麦籽粒中的累积,表明Zn对Cd有协同效应。Cd-Zn复合污染对小麦籽粒产量的交互效应的试验结果也得出相同结论。施猪厩肥显著提高了Cd单一污染与500mg·kg-1Zn、100mg·kg-1Cd复合污染土壤上小麦籽粒Cd含量。应用同位素示踪法和离子交换平衡法证实,109Cd、65Zn为复合体系共存与单一存在相比较,HA(FA)-65Zn络合物稳定性有明显的提高,HA(FA)-109Cd络合稳定性明显降低,且HA(FA)-109Cd的稳定性小于HA(FA)-65Zn。盆栽试验还说明猪厩肥降低了1000mg·kg-1Zn与100mg·kg-1Cd复合污染土壤上小麦籽粒Cd含量,是由于高剂量Cd、Zn污染的毒性所致。利用有机肥调控镉锌复合污染必须考虑其污染水平与比例、交互效应、土壤有效态含量、有机肥的络合作用、络合物稳定性及其竞争机制与肥力效应。
A series of pot experiments was done in the present study and the results showed that: at the level of 10 mg·kg-1 Cd in soil, added Zn reducedCd accumulation in grain, revealing that Zn had an antagonism effect on Cd, while at the level of 100 mg·kg-1Cd in the soil, added Zn promoted Cd accumulation in grain, suggesting that Zn had a synergism effect on Cd. The results were also tested and verified by Zn-Cd combined effect on yield of wheat grain. Application of (pig) organic manure increased Cd in grain when the soil was polluted by single Cd and combined 500 mg·kg-1Zn and 100 mg·kg-1Cd , it also was tested and verified by stability of 109Cd-humic(fulvic)acids and 65Zn-humic(fulvic)acids using radioactive isotope tracer and ion exchange balanced method . In 109Cd and 65Zn coexisting system by comparing with single pollution, HA (FA)-65Zn complex stability obviously increased, but HA (FA)-109Cd complex stability obviously decreased. The stability of HA (FA) -65Zn was higher than that of HA (FA) -109Cd. Organic manure decreased Cd in grain when soilwas polluted by combined 1 000 mg·kg-1Zn and 100 mg·kg-1Cd , which was caused by high Cd?Zn poisonous concentration . Using organic manure to controlCd, Zn combined pollution must be considered it polluted levers, proportion, available content in soil, interaction effect, stability and competition of complexes, fertility of organic manure.
出处
《农业环境保护》
CSCD
北大核心
2002年第5期393-398,共6页
Agro-Environmental Protection
基金
国家自然科学基金项目(49971049)
