Abstract: For the purpose of understanding relationships of functional diversities of soil microbial communities in mulberry gardens with the pollutants of polycyclic aromatic hydrocarbons(PAHs),the Biolog method was employed to evaluate response of soil microbial communities in a roadside mulberry garden to PAHs pollution in functional diversity.Results show that PAHs pollution of the soil varied in degree,showing an order of Section 2(located between Sections 1 and 3)>Section 3(farthest from the highway)>Section 1(closest to the highway).Biolog analysis indicates that the three sections followed the order of 2>3>1 in average well color development(AWCD) of carbon utilization of soil microbes.Section 2 was the highest in Shannon index and Gini index and significantly higher than Sections 1 and 3,while in Shannon evenness Section 1 was significantly lower than Sections 2 and 3.Section 2 was the highest in soil microbial activity and abundance of microbial community structure and followed by Sections 3 and 1.Principal component analysis shows that the differences in physiological function of the soil microbial community were sharp between the sections,and embodied mainly in metabolism of carbohydrates and amino acids.Redundancy analysis reveals that soil microbes in Section 2 was the most closely related to PAHs pollution,indicating that higher PAHs concentration is more likely to stimulate physiological activities of the soil microbes in the mulberry garden and also their metabolism function to some extent. 

Key words: PAHs, mulberry field soil, microorganism functional diversity, Biolog analysis