山东棕壤重金属污染土壤酶活性的预警研究

本文研究了重金属Cu2+、Cr3+、Pb2+污染对山东棕壤土壤过氧化氢酶、脲酶、磷酸酶、蔗糖酶活性的效应;提出了山东棕壤重金属Cu2+、Cr3+、Pb2+污染,土壤酶的预警指标和预警阈值。结果表明,在本试验条件下,Cu2+污染可以过氧化氢酶为预警指标,由相应的回归方程计算出国家土壤环境质量标准Cu2+的临界浓度的预警阈值:一级土壤为9.36%,二级土壤为11.57%;Cr3+污染可以脲酶为预警指标,其预警阈值:一级土壤为11.94%,二级土壤为15.12%;Pb2+污染可以蔗糖酶为预警指标,其预警阈值:一级土壤为1.50%,二级土壤为3.42%。

The warning research of soil enzyme activities on heavy metal-contamination of brown earth in Shandong

In this paper, the influence of heavy metals Cu2+ (CuSO4·5H2O), Cr3+ [Cr2(SO4)2·6H2O], Pb2+ [Pb (CH3COO)2·3H2O ] on the activities of catalase, urease, phosphatase, sucrase of brown soil in Shandong were studied. According to the results of the experiments, put forward warning index and the threshold value of warning of soil enzyme for heavy metals Cu2+, Cr3+, Pb2+ pollution of Shandong brown soil. Under the conditions of the study, the pollution of Cu2+ could take catalase as warning index, according to corresponding regression equation, work out the threshold value of warning of Cu2+ critical concentration in environmental quality standard value for soils, first-class soil was 9.36% and the second was 11.57%; the pollution of Cr3+ could take urease as warning index, the threshold value of warning of first-class soil was 11.94%,that of second-class soil was 15.12%; the pollution of Pb2+ could take sucrase as warning index, the threshold value of warning of first-class soil was 1.50%,and the second-class soil was 3.42%.