铜尾矿污染区土壤酶活性研究

Enzyme activities in soils contaminated by abandoned copper tailings

对浙江省哩浦铜尾矿污染区土壤酶活性进行了研究 .结果表明 ,尾矿区及其周边土壤环境受到不同程度的Cu、Zn、Pb、Cd污染 ,从尾矿库中心到外围重金属污染程度逐渐减轻 ,而土壤酶活性则不断提高 ,其中以脱氢酶和脲酶活性增加最明显 .回归分析表明 ,单一脱氢酶、脲酶、酸性磷酸酶以及蛋白酶活性与重金属复合元素含量之间存在显著线性关系 .主成分分析结果显示 ,尾矿区土壤酶信息系统的第一、二主成分方差贡献率之和达 98.2 4 % ,以第一、二主成分建立了两个土壤总体酶活性指标 ,并用此指标对各供试样本进行空间分类 ,其结果与以重金属含量为依据的划分结果基本吻合 .可见 。

Studies on the enzyme activities and heavy metal contents in soils polluted by abandoned copper tailings showed that the contents of heavy metals in contaminated soils were higher than those in no-polluted soils, and the enzyme activities, especially dehydrogenase and urease activities were decreased significantly with increasing contamination. Multivariate regression analysis indicated that soil dehydrogenase activity was very significantly correlated with the combined effect of several heavy metals, and urease, protease or acid phosphatase activity was significantly related to the combined effect of them. The total enzyme activity of soil might be a useful index in management of these highly contaminated soils, and hence, it is feasible to use this index as a primary biochemical parameter to evaluate heavy metals compound pollution.