中文摘要：

以中低毒有机磷农药敌百虫为试验对象,研究了美人蕉、凤眼莲和菖蒲对水体中敌百虫的降解效果以及3种植物根部POD、SOD的活性和MDA含量的变化。结果表明,3种水生植物均促进了敌百虫的降解,凤眼莲、菖蒲、美人蕉对敌百虫的平均去除率较无植物系统分别提高了21.55%、10.04%、33.83%,其修复能力大小依次为：美人蕉〉凤眼莲〉菖蒲。不同浓度敌百虫对3种水生植物的生理生化特性均有一定的影响,低浓度时可诱导植物根部解毒酶活性的增强,而较高浓度时植物正常生理代谢受到了抑制。在敌百虫胁迫下,美人蕉根部MDA的含量是3种植物中最低的,而且其SOD的活性最高,表明美人蕉受到的损伤最小,具有较强的抗逆性能力。因此,在选择水生植物修复敌百虫污染水体时,应优先考虑美人蕉。

英文摘要：

Trichlorfon, an organophosphorus pesticide with low toxicity, was selected as a test object. Treatment of triehlorfon polluted water using Canna, Eichhorniacrassipes and Acorus was studied, and changes in POD, SOD activity and MDA content of three kinds of plant roots in trichlorfon polluted water, were also studied. The results showed that three kinds of aquatic plant enhanced the degradation of trichlorfon. Compared to no plant system,removal efficieneies of trichlorfon are increased by 21.55%, 10.04% and 33.83% in Eichhor- niacrassipes, Acorus and Canna system, respectively. Thus, the treatment capability is as follows：Canna 〉 Eichhorniacrassipes 〉 Acorus. Moreover, MDA content of Canna root is the lowest in the stress of trichlorfon, while SOD activity is the highest,indicating that Canna suffered minimal damage and had strong resistance ca- pacity. Therefore, Canna is a better choice when choosing an aquatic plant to treat trichlorfon polluted water.