Abstract: In this study, the phytoremediation of petroleum-contaminated soil was researched for the first time by planting Phragmites australis, Tamarix chinensis and Elaeagnus angustifolia, and the phytoremediation effects of these plant species were compared. The result indicated that petroleum hydrocarbon of 26.50%-31.27% in petroleum-contaminated soil could be removed after the bioremediation was taken for 80 days, which was 15.57%-20.34% higher than that without taking the bioremediation. Saturated hydrocarbon removal was the best, and it could be up to 39.34%-46.18%. The analyzed results of microorganism in plant rhizosphere showed that the plant planting could significantly improve the amount of microorganism, and the rootsoil ratio of these three plant species was up to 23-169. The enzyme activity in soil was significantly improved in the plant planting experiment, and it was in an order of P. australis>E. angustifolia>T. chinensis. The activities of catalase, polyphenol oxidase and dehydrogenase were 1.12-1.34, 1.63-1.91 and 1.56-1.73 times of those without taking the bioremediation respectively. The results of this study will provide the theoretical and technical supports for developing the petroleumcontaminated soil in Xinjiang.

Key words: petroleum, soil contamination, phytoremediation, enzyme activity, Xinjiang