Abstract: Using temperature, moisture, surfactant TW-80 and C◇N◇Pratio as regulation factors, the biodegradation of ploycyclic aromatic hydrocarbons (PAHs)was carried out with an experimental period of 150 days.The results indicate that the degradation rate of PAHs reached 44.5～74.6% and 70.4～93.7% after 30 and 60 days, respectively.The optimum conditions for degradation during these periods were: temperature 40℃, moisture 25%, C◇N◇Pratio 120◇10◇1, and TW-80 concentration 200～500mg·kg^-1 .At the end of this experiment, the degradation rate of PAHs was up to 91.2～99.8%, with an optimum condition of temperature 40℃, and moisture 15%.The discrimination of Rvalue indicates that the influence of the four regulation factors on the degradation rate of PAHs varied with time.Temperature had a significant influence on the degradation of PAHs, and surfactants had a regulating role on the biodegradation of PAHs in soil.

Key words: Soil pollution, Polycyclic aromatic hydrocarbons, Biodegradation, Surfactant, sensitivity, temporal and spatial heterogeneity, BIOME-BGC model, parameter optimization