• 关键词：土壤-植物系统  黄豆  模拟酸雨  Cd  复合污染  环境效应

• 基金项目：教育部科学技术研究重点项目(No.[2000]156-00209);湖南农业大学科技创新基金(No.04PT02)

• 曾敏
• 湖南农业大学生物科学技术学院, 长沙 410128

• 廖柏寒
• 中南林学院资源与环境学院, 长沙 410004

• 曾清如
• 湖南农业大学资源环境学院, 长沙 410128

• 张永
• 湖南农业大学生物科学技术学院, 长沙 410128

• 罗承辉
• 湖南农业大学资源环境学院, 长沙 410128

• 王开峰
• 湖南农业大学资源环境学院, 长沙 410128

• 铁柏清
• 湖南农业大学资源环境学院, 长沙 410128

• 摘要：通过盆栽实验,研究了在黄豆(Glycinemax)的一个生长周期内,模拟酸雨与Cd复合污染对土壤基本性质的影响,模拟酸雨作用下土壤-植物系统中Cd的迁移转化规律以及模拟酸雨与Cd复合污染对黄豆生长与生理特性的影响,探讨了土壤-植物系统中这种复合污染的短期环境效应.结果表明,短期内模拟酸雨和Cd污染对土壤-植物系统都有致害作用,但Cd污染的效应大于模拟酸雨的效应,模拟酸雨与Cd复合污染环境效应大于这2种污染物的单因素效应,且表现出明显的协同作用.在本试验条件下,pH值为3.5的模拟酸雨和20mg·kg^-1Cd的处理组合对土壤-植物系统的危害最严重.尽管在短期内,协同作用仅在土壤交换态Cd含量、黄豆茎和根中的Cd含量这3项指标上得到一定程度的体现,但这种复合污染的化学机制和环境效应值得关注,这2种污染物长时期共同作用对土壤-植物系统的影响也值得深入研究.

• Abstract：Apot experiment was conducted to study complex effects of simulated acid rain and Cd on soil properties, chemical behaviors of Cd, growth and physiological characteristics of Glycine max plants in a growth cycle. The results indicated that, in a short period, both simulated acid rain and Cd were harmful to soil-plant systems, effects of Cd were more remarkable than those of acid rain, effects of complex pollution on soil-plant systems were more significant than simplex effects of simulated acid rain or Cd, and synergistic effects could be observed. In this experiment, toxic effects of the combination of simulated acid rain with pH 3.5 and Cd of 20 (mg·kg^-1) on soil-plant systems were the most serious. Although the synergistic effects, in a short period, exhibited merely in a few indexes such as Cd contents in soil exchangeable pool and in Glycine max stems and roots, chemical mechanisms and complex effects of acid rain and soil Cd are worthy of attention, and the long-term effects of the complex pollution need further studies.

• Key words：soil-plant system  Glycine max  simulated acid rain  Cd  complex pollution  environmental effect

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