石灰配施猪粪对Cd、Pb和Zn污染土壤中重金属形态和植物有效性的影响

Effects of Lime with Pig Manure on Fractions of Cd,Pb and Zn in Soil and Phytoavailability

通过盆栽试验,研究在镉、铅和锌污染土壤上,石灰和猪粪配施对土壤中不同形态镉、铅和锌含量及在蔬菜中累积的影响。结果表明:施入石灰(L)、石灰加低量猪粪(LP1)、石灰加高量猪粪(LP2)后,土壤中碳酸盐结合态Cd、Pb和Zn含量明显降低,土壤中铁、锰氧化物结合态和有机物结合态Cd、Pb和Zn含量明显增加;对大白菜吸收Pb、Cd和Zn均起到较好的抑制作用。单施石灰处理,石灰用量为5 g.kg-1土时,对大白菜吸收Pb、Cd和Zn的抑制效果最好;石灰配施猪粪处理,其中石灰5 g.kg-1土配施猪粪7.5 g.kg-1土以及石灰5 g.kg-1土配施猪粪15 g.kg-1土对大白菜吸收Pb、Cd和Zn的抑制效果最好。研究同时发现,低量猪粪配施石灰的效果强于高量猪粪配施石灰的效果。

A pot experiment was carried out to investigate the effects of lime with pig manure on the soil Pb, Cd and Zn fractions and plant uptake of these metal elements in the Chinese cabbage. The heavy metal fractions in soil were analyzed by using Tessier method. The results showed that with the treatments of lime （L） , lime ＋ lower pig manure （ LP1 ） , lime ＋ higher pig manure （ LP2 ） , contents of exchangeable bound to carbonate cadmium,lead and zinc in the soil decreased;contents of Fe-Mn oxide combined and organic matter combined cadmium, lead and zinc in the soil increased. At the same time, contents of cadmium, lead and zinc in the shoot of Chinese cabbage significantly decreased on the treatments of lime, the obvious treatment which inhibited absorption of Pb, Cd and Zn by plant,is the treatment with 5 g lime for 1 kg soil. In the treatments of lime with pig manure, both of the treatment with 5 g lime and 7.5 g pig manure, and 5 g lime and 15 g pig manure were better than other treatments for 1 kg soil. The results also showed that the effect of lime with lower pig manure is better than the lime with higher pig manure.