镉、锌、铅单元素及其复合污染 与土壤过氧化氢酶活性关系的研究

试验研究潮褐土中Cd、Zn、Pb单元素及其复合污染与土壤过氧化氢酶活性的关系结果表明,单因素处理Zn主要表现为抑制作用,并与土壤过氧化氢酶活性间存在显著线性负相关;Cd<10mg/kg时表现为激活作用,达50mg/kg时表现为抑制作用,并与土壤过氧化氢酶活性间存在显著指数负相关;而Pb主要表现为激活作用,与土壤过氧化氢酶活性间存在显著线性正相关,且单因素Cd、Zn、Pb对土壤过氧化氢酶活性抑制顺序为Zn>Cd>Pb。复合污染条件下重金属Cd、Zn、Pb交互作用较复杂,Cd、Zn对土壤过氧化氢酶活性交互作用表现出协同抑制负效应特征;而Pb表现出明显的拮抗作用或屏蔽效应,尤其Pb浓度高时其屏蔽作用明显。同浓度Cd、Zn其复合因素处理土壤过氧化氢酶活性高于单因素处理,而Pb复合因素处理土壤过氧化氢酶活性明显低于单因素处理。

Effect of single element and compound pollution of Cd, Zn, Pb on soil catalase activity

Pot experiment was conducted to study effect of single cadium, zinc and lead as well as compound pollution of the tree elements on soil catalase activity in medium loam meadow cinnamon soil. The results show that single element zinc exhibits an obvious inhibiting effect on catalase and there is a significant linear negative correlation between them, whereas lead has an activating function on it, there is a significant linear positive correlation between them. When the concentration of cadium is less than 10mg/kg, cadium exhibits an activating function on catalase. When the concentration of the element reaches 50mg/kg, the activity of the enzyme is inhibited. The toxicity order of the inhibiting effect of the three elements on catalase is Zn>Cd>Pb. Under the combination of the three elements, influence of Cd, Zn, Pb compound pollution on catalase activity differs from that of each single element treatment. The characteristics of Cd and Zn exhibit a synergistic inhibiting negative effect, whereas Pb for catalase exhibits a protective effect, especially the high concentration of Pb. The catalase activity of compound pollution is more than that of single element Cd under the same Cd concentration. Zn is the same as Cd, but Pb is different from the front elements. The catalase activity of compound pollution is less than that of single element Pb under the same Pb concentration.