摘要： 为了探究4种挺水植物在高浓度氮、磷胁迫下对污染水体的耐受能力，人工模拟水体氮磷动态变化条件，在室外开展氮、磷耐受性盆栽试验，通过研究植物抗氧化酶防御系统中主要酶学指标超氧化物歧化酶（SOD）和过氧化氢酶（CAT）活性及丙二醛(MDA)含量，确定4种挺水植物氮、磷耐受范围。结果表明：①随着氮、磷浓度增大，4种挺水植物SOD、CAT活性及MDA含量逐渐升高，当氮、磷浓度超出植物耐受范围，SOD、CAT活性及MDA含量开始下降。②4种挺水植物氨氮耐受范围：菖蒲、香蒲：20～400 mg/L，美人蕉、芦苇：20～500 mg/L。③4种挺水植物磷耐受范围：菖蒲：2～200 mg/L，美人蕉、芦苇和香蒲：2～300 mg/L。

关键词: 挺水植物, SOD, MDA, CAT, 耐受性

Abstract: To explore four quite underwater plants in the high concentration of nitrogen and phosphorus stress tolerance ability of the polluted water, artificial simulated water conditions on the dynamic change of nitrogen and phosphorus,nitrogen and phosphorus in the outdoor tolerance pot experiment, through the study of plant antioxidant enzyme defense system main enzymology indexes superoxide dismutase (SOD) and catalase (CAT) activity and malondialdehyde (MDA) content, this paper determines the tolerance range of nitrogen and phosphorus of four emergent plants. The results show that with the increase in nitrogen and phosphorus concentration, the activities of SOD and CAT in the four plants increased first and then decreased, while the content of MDA gradually increased and began to decline after exceeding the plant tolerance capacity. The final conclusion is that the tolerance range of the plants to ammonia nitrogen is as follows: calamus and cattail: 20~400 mg/L, canna and reed: 20~500 mg/L, phosphorus tolerance range was as follows: calamus: 2~200 mg/L, canna, reed and cattail: 2~300 mg/L.

Key words: emergent?plant, SOD, MDA, CAT, tolerance