重金属单一污染对龙须草生长与生理生化特性的影响

Effects of single heavy metal pollution on the growth and physiological and biochemical characteristics of Eulaliopsis binata

试验研究了不同处理水平下Cd、Pb、Cu、Zn、As单一污染对龙须草生长和生理生化特性的影响。结果表明:龙须草地下部对重金属的抗性大干地上部,种植龙须草的污染土壤中Cd、Pb、Cu的土壤临界值可分别设定为10mg／kg、300mg／kg和100mg／kg;龙须草叶绿素含量随重金属处理浓度的增加呈先升后降趋势,但其总叶绿素含量和叶绿素a／b值均低于对照;龙须草SOD活性随Zn、As单一污染处理浓度的增加呈先升后降趋势,而随其他3种重金属处理浓度的增加呈下降趋势;龙须草CAT和POD的活性随As处理浓度的增加呈上升趋势,而随其他4种重金属处理浓度的增加呈先升后降趋势。

The effects of Cd,Pb, Cu,Zn and As on the growth and physiological and biochemical characteristics of Eulaliopsis binata were studied. The results show that the resistance of Eulaliopsis binata root to heavy metals is stronger than that of shoot. The critical values of Cd,Pb, Cu of the polluted soil that Eulaliopsis binata is grown on are 10mg/kg, 300mg/kg and 100 mg/kg,respectively. The pot experimental results show that contents of chlorophyll and chlorophyll a/D in Eulaliopsis binata growing in treated soils with Cd,Pb,Cu, Zn and As separately are less than those of CK. With the increase of the concentration of Cd, Pb, Cu, Zn and As, the content of chlorophyll increases first and decreases afterwards. With the increase of the concentration of As and Cd, the activity of SOD increases first and decreases afterwards. But the activity of SOD decreases with the increase of the concentration of Pb, Cu and Zn. The activity of CAT and POD increases with the increase of the concentration of As and increases first and decreases afterwards with the increase of the concentration of Cd,Pb,Cu and Zn.