【摘要】 石油中的重金属组分能影响微生物对土壤中石油烃的降解效率。采用实验室前期筛选的两株高效石油烃降解菌枯草芽孢杆菌(Bacillus subtillus)和多食鞘氨醇杆菌(Sphingobacterium multivorum),研究了石油中常见的3种重金属镉、镍、钒及其组合对这两种菌生长的影响,以便为理解降解菌在石油污染土壤中的生长代谢及预测其修复效率提供理论基础。镉、镍、钒对菌的生长均具有抑制作用,在一定范围内呈良好量效关系,生长抑制效应由强到弱的顺序为Cd>Ni>V。两种菌对同一重金属的抗性因重金属种类差别也有所不同。3种重金属在其组合中对菌的生长抑制效应所起的作用大小取决于其各自的浓度水平。除Ni和V在低浓度水平下的交互具有协同作用外,重金属之间的交互作用均呈拮抗关系。更多还原

【Abstract】 Heavy metals in petroleum affect bioremediation of petroleum-contaminated soils.The effect of Cd,Ni,V and their combinations on the growth of two petroleum-degrading bacteria(Bacillus subtillus and Sphingobacterium multivorum) is studied to understand bacteria growth in petroleum-contaminated soils and predict the petroleum removal efficiency.Cd,Ni and V inhibites bacteria growth and there is a good dose-effect relationship.The inhibition effect follows the order of Cd>Ni>V.The two bacteria react differently to different metals.The role of the three metals in their combinations is dependent on their respective concentration.Except that Ni and V shows a synergistic effect at low concentrations,the interactions among heavy metals are antagonistic.更多还原