地下水对土壤耕层的污染特性研究

通过模拟不同水位、污染度的地下水在不同质地土壤耕层中的迁移，进行了地下水中盐分和重金属对土壤耕层污染规律的研究。结果表明，不同水位、不同质地土壤中，污染地下水在土壤中EC值的垂直分布规律相似，土壤底层和表层EC值较高。轻质土耕层内EC值变幅较大；水位越高，耕层中EC值总体越小。地下水中Na和SO4^2-在土壤耕层中的分布以表层浓度较高，其他层上浓度较低。Cr^6 在土壤表层分布浓度较高，Hg^2 在近地表层浓度较高，而Pb^2 在土层上的分布没有明显的规律。对单一离子来说，随着地下水污染度的增加，在某一土层上该离子的浓度也有所增大。

Pollution Characters of Contaminated Groundwater to Soil Pough Layer

By simulating the movement of groundwater in soil plough layer, the pollution characters of groundwater contaminated by salinity and heavy metals in the plough layer were researched under different water tables, different pollution levels and various texture soils. The vertical distribution of groundwater EC in soil showed similar under different water tables and texture soils, with higher values at the subsoil and topsoil, and changed much in light soil. The higher the water table, the lower the average EC in plough layer. Na+ and also showed similar distribution in soil, and with more amounts in topsoil than in others. The concentration of Cr6+ was higher in topsoil and Hg2+ in upper soil, but the distribution of Pb2+ in soil showed no apparent trend. The distribution of single ion in soil was consistent, and the content of each ion in one layer increased with the increasing pollution of groundwater.