铅污染对青紫泥微生物活性的影响

土壤微生物量碳、基础呼吸作用、土壤代谢商是表征土壤质量的重要指标,并且与土壤本身的理化性质有关。脱氢酶活性是土壤微生物种群及其活性的重要敏感性指标之一。通过室内培养,研究了不同铅添加水平(200~1 200 mg/kg)对青紫泥田微生物生物量碳及土壤基础呼吸作用、土壤代谢商、土壤脱氢酶的影响。研究表明:随培养时间延长,青紫泥田生物量碳呈下降趋势,基础呼吸作用随铅浓度升高而加强。土壤代谢商随培养时间延长变化趋势不同。外源铅胁迫下土壤脱氢酶活性随铅处理浓度升高明显受抑制。相关分析表明,土壤铅含量与土壤微生物生物量碳、脱氢酶在不同培养时期相关性不同。

Effects of Lead Pollution on Soil Microbial Activities

Soil basal respiration,soil biomass carbon,metabolic quotient are important indexes of soil microbiological,they relate to physical-chemical character of soil.The dehydrogenase activity is the important sensitivity index of microbial community and activity on soil.Different added lead concentration ranging from 200 mg/kg to 1 200 mg/kg effect on soil basal respiration,soil biomass carbon,metabolic quotient and dehydrogenase activity.The experiment was studied in house incubated soil samples.The results showed as follows: soil biomass carbon decrease with extend incubated times.Soil basal respiration was increased with increased concentration of lead.Soil metabolic quotient were changed with different incubated time.Soil dehydrogenase significantly decrease under lead stress.The correlation analysis indicated that soil added lead content different correlation with soil biomass carbon,dehydrogenase activity in different incubation times.