重金属Cu的土壤微生物毒性研究

Cu进入土壤后的早期阶段 ,低浓度对土壤微生物生物量有刺激作用 ,而高浓度则起抑制作用 ;表现在微生物呼吸强度升高 ,微生物生理生态参数代谢商 qCO2 增大 ,微生物生物量碳与有机碳的比值 (Cmic/Corg)降低 ;但土壤对Cu高强的结合容量导致该效应随时间而变得不显著 ;Biolog数据表明 ,在Cu的胁迫下 ,不仅微生物的群落结构有所改变 ,而且对碳源的优先利用种类发生了转移 ,碳源消耗量增加 ,消耗速度变快 ,同时这样的损伤效应具有长期性。

Study on Microbial Toxicity of Heavy Metal Copper

After input of copper into the soil,microbial biomass increased at low copper concentration while decreased at elevated concentration,and microbial basal respiration rates became rapid;microbial ecophysiological parameters qCO 2 value enlarged,while Cmic./Corg. ratio lowered.But higher binding capacity of soil to copper lead these effects less and less obviously with the incubation times.Biolog data revealed that under press of copper,micoorganisms not only changed in their community diversity and structure,but shifted in their preferential utilization kinds of carbon sources,and consumed carbon sources even more in quantities and more rapidly in speed ,furthermore,these impairments performed long term effects.