铅污染对土壤微生物及酶活性的影响

The Effect on Soil Microbe and Enzymes of Lead Pollution

为筛选出土壤铅污染的敏感微生物及酶学指标,通过室内培养试验,该文研究了土壤铅污染对土壤微生物基础呼吸及土壤脲酶、脱氢酶、酸性磷酸酶的影响,结果表明,随着土壤铅添加浓度的提高,土壤微生物基础呼吸呈现出上升的趋势,土壤脲酶则随着铅浓度的增加呈现出不断下降趋势,土壤脱氢酶活性则在低浓度下上升而随着添加浓度的进一步提高迅速降低,可见,这两种酶对土壤铅毒害反应灵敏,可以作为土壤铅污染评价的指标,而土壤磷酸酶则对铅浓度的变化没有表现出明显的统计规律性,不适宜作为土壤铅污染评价的酶学指标。

To sift a optimum and sensitive evaluating indicator of soil Pb pollution.The soil incubation experiment was carried out to study the effect on soil microbe and enzymes under Pb addition.The results showed that there are discrepancial effects of heavy metals on soil enzymes.Soil basal respiration increased with increasing Pb leading,however,the activity of urease markedly declined with increasing Pb loading.Dehydrogenase activity slightly increased at low level of Pb and decreased at higher level,which indicated that the two kinds of soil enzymes activity is feasibility to act as index of Pb pollution.There are not statistical regularity between the soil phosphatase activity and Pb addition,which shows that soil phosphatase is not available to act as an index to evaluate Pb pollution.