降尘和酸雨对蔬菜中金属离子的影响

采用盆栽试验，研究了降尘、酸雨单一污染和复合污染对菠菜和生菜中铁、镁、锰、镍含量的影响。结果表明，降尘使菠菜和生菜中铁、镁、锰、镍的含量均有不同程度的提高；酸雨ｐＨ 值不同，使菠菜和生菜中铁、镁、锰、镍的含量表现出不同的变化规律。与单一酸雨污染相比，复合污染使菠菜与生菜中铁的含量分别平均升高１ ．４８ 和１５ ．８９ 倍，而镁的含量则略有降低。锰、镍在菠菜中的含量当ｐＨ 值＞ ３ ．５ 时，复合污染高于单一酸雨污染；当ｐＨ 值＜ ３ ．５ 时则正好相反。随着酸雨ｐＨ 值的变化，复合污染和单一酸雨污染使生菜中锰和镍的含量变化趋势基本相同

Effect of Drop in Dust and Acid Rain Pollution on Accumulation of Metal Ions in Vegetables

Through pot planting experiment, the paper studied ion content of Fe,Mg,Mn,Ni in spinach and romaine lettuce under single and compound pollution of acid rain and drop in duct. The results showed as following: Compared with the control test, drop in dust made the contents of Fe,Mg,Mn,Ni all raised at different level in two kinds of vegetables; the contents of these metal ions in two kinds of vegetables were different with pH levels. Compared with single acid rain pollution, compound pollution made contents of Fe in spinach and romaine lettuce raised 1.48 and 15.89 times, but the contents of Mg decreased slightly. When pH>3.5, the contents of Mn and Ni in spinach under compound pollution were higher than under single acid rain pollution; When pH<3.5 it was contrary. The variational rule of contents of Mn and Ni in romaine lettuce did not change basically under the two pollution.