重金属Cd、Zn、Pb复合污染对土壤酶活性的影响

采用回归正交设计方案 ,研究了潮褐土中Cd、Zn、Pb复合污染对 4种土壤酶活性 (过氧化氢酶、脲酶、碱性磷酸酶、转化酶 )的影响 .结果表明 ,在复合效应影响中 ,重金属对土壤酶活性的抑制效应顺次为Cd >Zn >Pb ;同时 ,Cd、Zn、Pb复合污染对 4种土壤酶活性的影响效应存在着明显差异 .其复合污染对脲酶表现出协同抑制负效应的特征 ;对过氧化氢酶表现出一定的屏蔽作用 ;对转化酶和碱性磷酸酶活性影响则主要随着Cd浓度的增加而显著降低 .离子冲量与土壤脲酶活性之间呈显著负相关 ,用脲酶活性作为预测土壤重金属Cd、Zn、Pb复合污染程度的主要生化指标具有一定的可行性

Effect of compound pollution of heavy metals on soil enzymic activities

Pot experiment was conducted to study effects of Cd-Zn-Pb compound pollution on four soil enzymic activities(urease, calatase,alkaline phosphatase and intertase)in medium loam meadow cinnamon soil1 The results showed that the inhibiting effect of the three heavy metals on four soil enzymes had a toxicity order:Cd>Zn>Pb meanwhile,influence of Cd-Zn-Pb complex pollu-tion on four soil enzymic activities was very different. The compound pollution of Cd-Zn-Pb on urease activity exhibited synergistic inhibiting negative effect activit y,white on calatasse activit y exhibited protective effect to some extent. Under combination of Cd-Zn-Pb,mainly with increasing Cd contents,intertase and phosphatase activities decreased significantly 1There is a very significant negative correlation between urease and ionic implusion,so it is feasible to use soil urease activit y as primary biochemical index to evaluate Cd-Zn-Pb compound pollution.