土壤的芘污染与土壤酶活性

Pyrene contamination and soil enzyme activity.

选择芘作为多环芳烃(PAHs)代表污染物、敏感土壤酶作为污染物的生态毒理指标,探讨芘暴露下土壤酶活性的变化。结果表明:芘的添加浓度>50μg·kg-1时,对土壤脲酶、土壤脱氢酶活性有先抑制、后激活的作用,对土壤磷酸酶活性有激活作用;芘的添加浓度为50～1200μg·kg-1时,对土壤过氧化氢酶活性没有影响。土壤脲酶、脱氢酶、磷酸酶活性有可能作为芘污染土壤的生态毒理指标。

An experiment was conducted to study changes in enzyme activities in soils exposed to pyrene.The relationship between activities of different enzymes and concentrations of pyrene added were investigated,and sensitive enzymes were cited as eco-toxicological indicators for soil diagnoses of PAHs contamination.The results show that with pyrene (concentration>)50 μg·kg^(-1),urease activity and dehydrogenase activity were first inhibited and later activated. However,the activity of phosphatase was activated by the addition of pyrene.No obvious change in catalase activity was observed when concentration of pyrene ranged from 50 to 1 200 μg·kg^(-1).It can be concluded that activities of soil urease, dehydrogenase,and phosphatase could possibly be used as diagnostic indicators of soil contamination with pyrene.