化学调控作用对Cd Pb Cu复合污染菜地土壤中重金属形态和植物有效性的影响

通过盆栽试验，研究了有机物料和无机分子筛材料两种调控剂对集约化菜地土壤Cd、Pb和Cu形态变化及在蔬菜中的累积影响。结果表明，两种调控剂对土壤重金属Cd、Pb和Cu污染调控效果不同，有机物料降低了土壤中可交换态Pb的含量，对小白菜茎叶吸收Pb具有较好的抑制作用，但提高了土壤中可交换态Cd、Cu的含量，使小白菜茎叶中Cd、Cu的含量增加。而施加无机分子筛材料可降低土壤中可交换态Cd、Pb、Cu的含量，对小白菜茎叶吸收Cd、Pb和Cu均起到了较好的抑制作用。研究同时发现，施加两种调控剂后，土壤中重金属Cd、Pb和Cu的各种形态所占比例并无根本性变化，这可能与重金属的特性有关。

Effects of Organic Manure and Molecular Sieve Material on Speciation of Cd, Pb and Cu in Soil and Bioavailability

A pot experiment was carried out to investigate the effects of organic manure and molecular Sieve material,2 soil conditioners,on the soil Cd,Pb and Cu speciation and plant uptake of these metals in the vegetable land.The heavy metals fractions in soil were analyzed by using Tessier method.The results showed that there were some differences in soil amelioration effects of contamination between two conditioners.Organic manure decreased the bioavailability of Pb and inhibited the Pb absorption in pakchoi,while it increased the bioavailability of Cd and Cu in soil,and Cd and Cu contents in pakchoi increased.Contrasted with organic manure,molecular sieve material decreased the bioavailability of Cd,Pb and Cu in soil.The results also showed that the proportions of fractions for cadmium,lead,and copper didn't change radically after two soil conditioners were applied in soil.