【摘要】 为明确紫花苜蓿(Medicago sativa)在陇东黄土高原地区油污土壤场地生态修复过程中的响应情况,在长庆油田公司第二采油厂陇东油泥处理站进行为期3个月的实际场地修复试验,采用常规方法测定4种油污浓度对紫花苜蓿生长和生理指标的影响。结果显示,株高、根长、地下生物量、石油降解菌数量和初始总石油烃(TPH)降解率随油污浓度增加而逐步降低(P <0.05);油污浓度在7%时对其生物富集系数(BCF)抑制程度最大,但在1%和4%浓度时其生物转移系数(TF)变化不显著(P> 0.05);抗氧化酶体系随油污浓度增加呈先增后降的变化趋势,且在油污浓度为5%时达到最高。综上所述,采用紫花苜蓿在陇东黄土高原地区开展油污土壤场地修复时油污浓度不应超过5%。更多还原

【Abstract】 In order to clarify the comprehensive response of Medicago sativa when used to ecologically remediate a site in eastern Gansu Province that contained oil-contaminated soil, a 3 month ecological site remediation program was implemented at the Sludge disposal station of a secondary oil production plant affiliated to the Petro china Changqing Oilfield Company. The growth responses and physiological indicators of Medicago sativa under stress at different total petroleum hydrocarbons(TPH) concentrations were determined. We found that plant height, root length, plant underground biomass, amount of TPH degrading bacteria, and the TPH degradation rate of Medicago sativa decreased as the TPH concentration increased(P < 0.05). The 7% TPH concentration significantly reduced the rhizosphere BCF index, but there were no significant differences between the 1% and 4% concentrations(P > 0.05). The activities of antioxidant enzymes showed a single hump-shaped tend, and the greatest antioxidant enzyme activity was observed when the TPH concentration was 5%. All the results indicated that the TPH concentration should not exceed 5% when Medicago sativa is used to ecologically remediate sites containing oil-contaminated soil in the eastern region of the Loess Plateau.更多还原