施肥对铅镉污染土壤上芥菜铅镉含量及生理的影响

盆栽试验研究了不同化学肥料组合处理对铅镉污染土壤上芥菜(Brassica juncea)Pb、Cd含量及其生理特性的影响。结果表明, 与对照相比, 各肥料处理在显著提高芥菜生物量的基础上, 显著降低了芥菜地上部Cd含量(P<0.05), 其中碳酸氢铵+磷酸二氢铵+硫酸钾处理的效果最佳, 芥菜Cd含量仅为对照的41.0%; 施肥处理提高了芥菜地上部Pb含量, 但Pb没有健康风险; 施肥提高了叶菜的叶绿素含量, 但丙二醛、脯氨酸、细胞质膜透性与芥菜地上部Pb、Cd含量无显著相关性。重金属污染土壤施肥处理是一种值得推广的降低叶菜有害重金属含量的有效技术。

Effect of fertilization on Pb and Cd content, and on physiological property of mustard growing in soil polluted by Pb and Cd

A pot experiment was conducted to investigate the effects of the combined application of different fertilizers on the contents of Pb and Cd and on the physiological properties of mustard (Brassica juncea) in Pb and Cd polluted soils. The results show that fertilization treatments significantly decrease Cd uptake in mustard shoot, besides a significant mustard biomass increase compared with the control (P<0.05). Shoot Cd content under optimal combination of ammonium bicarbonate, ammonium dihydrogen phosphate and potassium sulfate treatment is only 41.0% that of the control. Fertilization increases the shoot Pb content of mustard, which is far lower than the standard of Pb content for the safe vegetable. Fertilizer application increases vegetable chlorophyll content, but with insignificant correlation between malondialdehyde (MDA), proline, cell membrane permeability and shoot Pb, Cd contents. Fertilization of heavy metal contaminated soils is a practicable technology for mitigating heavy metal content in shoots of leaf vegetables.