石灰泥炭对镉铅锌污染土壤上小白菜生长和元素吸收的影响

采用盆栽方法研究了在镉、铅、锌污染土壤上,石灰和泥炭对小白菜生长状况及对污染元素(Ｃｄ,Ｐｂ,Ｚｎ)和养分元素(Ｎ,Ｐ,Ｋ,Ｃｕ,Ｍｎ,Ｆｅ)吸收的影响。结果表明,石灰消除了重金属的毒害症状．显著促进小白菜的生长、显著抑制小白菜对镉、铅、锌的吸收。石灰对氮、钾、铜、锰的吸收也有显著抑制作用。泥炭对小白菜生长的改善效果及对铜、铅、锌吸收的抑制效果较石灰差。提高酸性土壤ｐＨ值是减少作物对重金属吸收的有效方法。

Effects of lime and peat on the growth and element uptake of Brassica chinensis in Cd,Pb,and Zn contaminated soil

The effects of lime and peat on the growth and the uptake of Cd, Pb, Zn, Cu, Mn, Fe, N, P, K of Brassica chinensis in a Cd-Pb-Zn contaminateded soil were studied by pot experiment. The growth of Brassica chinensis was apparently improved by liming. The uptake of Cd, Pb and Zn in Brassica chinensis was significantly depressed and the poisonous symptom of heavy metals was eliminated. The absorption of Cu, N, P and Mn was also inhibited by liming. In comparison with lime , peat showed a much weaker effect on the growth of the vegetable and the uptake of the above elements. The results showed that pH was the main factor controlling the uptake of the heavy metals by Brassica chinensis. Lime can be used as an effective additive for improving the growth of Brassica chinensis and the absorption of Cd, Pb, Zn by the vegetable .