摘要：Soil pollution by petroleum hydrocarbon (PHC) in the coastal wetland of Yellow River Del-ta, China, has seriously threatened ecosystem health and function. Phytoremediation is an innovative and cost-effective option to remediate the contami-nated soil. However, selection of the suitable plant species is an important step for successful bioreme-diation of the PHC contaminated soils. The biodeg-radation abilities of five plant species including Sesbania, Seepweed, Sea lavender, and Central Asia Saltbush grown in the PHC contaminated soil was investigated using a 90-day pot experiment. The removal of PHC in the rhizosphere soils was more efficient compared to the without planted soils(64.8% vs 20.2%). With reference to plant properties, the biomass, surface area and volume of the roots were negatively correlated with PHC concentration(r=-0.816,-0.869 and -0.90,P<0.05, n = 10), respectively, confirming that plant with higher biomass and larger root resulted in more PHC remediation. The BioLog community profile illustrated that Sesbania rhizosphere was the most dynamic microzone. In addition, the rhizo-sphere soil pH declined from 7.94 to 7.58 during the incubation period. Overall, Sesbania with higher biomass and larger root system and active microbial diversity(Shannon diversity index 3.2 on 90 day)was an ideal plant for on-site remediation of the petroleum polluted coastal wetland soils.
