文摘
Diesel spills may considerably damage the sensitive coastal wetlands along Huangpu River, Shanghai, China. In this experiment, Cyperus rotundus, a dominant coastal marsh plant, was cultured in diesel-contaminated soils at concentrations of 0, 1000, 5000, 10,000, 15,000 and 20,000 mg kg鈭? to investigate its phytoremediation potential. In this study, plant biomass, removal characteristic of diesel, redox potential, and activities of urease, dehydrogenase, and polyphenoloxidase in soils were determined after 50-day pot experiments. The results demonstrated that soils planted with Cyperus rotundus had significantly less diesel than did unplanted soils. The residual concentrations of alkanes in soils at 10,000 mg kg鈭? after 50 days showed that 52.9鈥?2.0 % of Fraction a (C14鈥揅19) and 47.8鈥?4.4 % of Fraction b (C20鈥揅27) were removed in unplanted soils, while more than 90 % of both Fractions a and b were removed in planted soils. The peak value of urease and dehydrogenase activities was at 15,000 mg kg鈭? of diesel-contaminated concentration; however, the peak value of polyphenoloxidase activity appeared at 10,000 mg kg鈭?. It was deduced that the diesel concentration between 10,000 and 15,000 mg kg鈭? might be a limit which Cyperus rotundus could tolerate diesel pollution. Keywords Phytoremediation effect Cyperus rotundus Diesel-contaminated soil Wetland