Effects of arbuscular mycorhizal fungus on remediation of pyrene contaminated soil by corn with different phosphorus concentration

Pot experiments were conducted to investigate the effects of arbuscular mycorhiza fungus（AMF）on the removal of pyrene in soil by corn（Zea Mays L.）with different phosphorus concentration treatments. Results showed that AMF community successfully inoculated corn in the soil with 50 mg/kg pyrene plus 80 and 20 mg/kg phosphorus treatment. After 60 days of 80 and 20 mg/kg phosphorus treatment, pyrene residue decreased 38% and 35% comparing with AMF inoculated corn treatment, and 53% and 58% comparing with control, respectively. Results indicated that AMF inoculation significantly reduced pyrene residue in soil, increased the capacity of pyrene removal. Comparing with 20 mg/kg treatment, pyrene residue decreased 16% and 19%, respectively, with inoculation and control treatment under 80 mg/kg phosphorus application. It suggested that phosphorus had positive effect on the removal of pyreme in low phosphorus soil with corn AMF inoculation. Results also showed that C in soil microbial biomass had a significant posive relationship with pyrene removal rate in soil. Both corn inoculation by AM and 80 mg/kg phosphorus treatment significantly increased C in soil microbial biomass, thus, the increase of microbial number was most likely the reason to reduce the pyrene residue in soil.