土壤－植物系统中多环芳烃和重金属的行为研究

Behaviors of polycyclic aromatic hydrocarbons (PAHs) and heavy metals in soil-plant system

对土壤中多环芳烃和重金属的行为研究表明，与对照相比，０—２０ｃｍ以上表土层存在多环芳烃和重金属积累，２０ｃｍ以下土层未发现积累；与春、秋两次采样结果相比，土壤中多环芳烃的含量有所下降，表明土壤微生物对多环芳烃有一定降解作用，且其降解程度与土壤－植物系统的生态结构有关．菲在地下水中检出浓度较高，表明这一污染物有向下迁移的可能性．此外，柳树对土壤中重金属Ｃｄ的积累有明显的削减与净化作用．本研究表明，严格限制污水中多环芳烃和重金属的污染负荷以及设计合理的生态结构是避免多环芳烃和重金属在土壤中积累的关键．

In order to understand the fate of PAHs and heavy metals in soil-plant system,the behaviors of PAHs and heavy metals in soil of land treartment system (LTS) at western Shenyang were studied. PAHs and heavy metals are accumulated in 0-20cm soil layer, and can not be found below. The PAHs content is decreased from April to October, which shows that soil microbes play an important role in the degradation of PAHs, and the degradation rate is related to ecojogical structure of soil-plant system. Phenanthrene can be determined with a high concentration in the groundwater, which indicates the possibility of its migration downward. Willow can reduce and purify heavy metals. This study shows that strict control of pollutant load of PAHs and heavy metals in wastewater and rational design of ecological structure are the key points for avoiding the accumulation of PAHs and heavy metals in soil.