矿山充填复垦场地重金属含量对比研究

Comparison of Heavy Metal Contents Between Different Reclaimed Soils and the Control Soil

为保证矿山充填复垦场地作为农用地的生态安全性，通过对现场不同深度土壤、小麦根系采样分析，研究了粉煤灰和煤矸石两种不同物料充填复垦场地中As，Hg，Pb，Cu，Cd，Cr，Zn等重金属的含量，并与当地对照土壤比较．结果表明：粉煤灰中Pb，Cu含量高于比照土壤，矸石中Cu，Zn含量高于比照土壤，但是充填复垦场地覆土土层0～20cm厚度内，除了矸石充填场地Zn明显高于比照土壤外，其他元素含量均无明显差异，覆土土层40cm厚度处，矸石充填场地Cu，Zn含量明显高于比照土壤；而充填复垦场地作物根系中的重金属含量与对照场地不存在明显差异，矸石与粉煤灰中重金属的含量与作物根系的重金属含量并不成正比．

To keep the ecological safety of the reclaimed lands filled with mining wastes and fly ash used as agricultural purpose, the contents of heavy metals As, Hg, Pb, Cu, Cd, Cr, Zn in different soils, including the reclaimed soils and control soil with different depths and the roots of wheat, were tested. The result shows that the contents of Pb and Cu in the fly ash and Cu and Zn in mining wastes are higher than that in the control soil, but only Zn in the covered soil with 20 cm depth and Zn and Cu in the covered soil with 20 cm and 40 cm depth on mining wastes filled sites are markedly higher than that in the control soil with the same depth. However, there are not remarkable differences for the contents of heavy metals in the roots of wheat on different reclaimed sites and the control site.