铜尾矿区土壤与凤丹植株重金属富集研究

对安徽铜陵铜尾矿区凤丹种植地的土壤和凤丹中重金属污染状况进行了研究.结果表明,尾矿库区种植地极端贫瘠,有机质含量仅1.1～3.4g·kg^-1,而土壤Cu、Cd、Pb、Zn含量皆高于对照土壤,其中Cu含量达587.43～1176.44mg·kg^-1,Cd含量达3.08～5.16mg·kg^-1,约达国家土壤二级标准的10倍.凤丹各部位的Cu、Cd和Pb含量均超过了药用植物的限量标准,尤其是根皮部位Cu含量达31.50～64.00mg·kg^-1,Cd含量达0.98～1.45mg·kg^-1,超出标准1.6～3.6倍,表明种植地和凤丹都受到严重污染.凤丹不同部位中的Zn、Cd、Pb和Cu分别以茎、叶、叶和根皮中的含量最高.凤丹对Cd、Zn的富集比Cu和Pb高,但在根皮中的富集系数均较小.

Heavy metals accumulation in different parts of Paeonia ostii and soils at copper tailings yard

The study on the heavy metals contamination of Paeonia ostii and soil at the copper tailings yard in Tongling City indicated that the soil of copper tailings yard was extremely barren,only with 1.1～3.4 g·kg^-1 organic mater (1/15 of normal soil),but the contents of its Cu,Cd,Pb and Zn were much higher.Cu and Cd contents were 587.43～1 176.44 mg·kg^-1 and 3.08～5.16 mg·kg^-1,respectively,5～10 times higher than the grade two of national environmental quality standard for soils.Cu,Cd and Pb contents in Paeonia ostii exceeded the standard of medicine-use plants.Especially in its root peel,Cu and Cd contents stood at 31.50～64.00 mg·kg^-1 and 0.98～1.45 mg·kg^-1,respectively,1.6～3.6 times surpassing the standard,which meant that both Paeonia ostii and the soil had been severely polluted.There existed evident difference in the contents of heavy metals in different parts of Paeonia ostii.Stem,leaf and root peel had higher contents of Zn,Cd,Pb and Cu.The accumulation factors of Zn and Cd were higher than those of Cu and Pb,but they were all smaller in root peel.