In order to explore the effects of lead pollution in road soil on avenue trees and soil arbuscular mycorrhiza(AM)fungi,six types of roads with avenue trees as camphor tree(Cinnamomum camphora)were selected in Nanchang City,and the lead content of soil and camphor tree and the characteristics of AM fungi community were determined and analyzed.The results showed that there were significant differences in soil lead content among different types of roads.The lead content of expressway and main roads was higher than that of branch roads,and traffic flow was an important driving factor.The average lead content in the roots,stems,leaves and fruits of camphor tree was 0.41,1.13,1.43 and 0.53 mg/kg,respectively.The lead content in the camphor tree on the main roads was generally high,and the lead content in the camphor tree on the branch roads was relatively low.There was a significant positive correlation between soil lead content and lead content in the root of cam-phor tree.The root colonization rate,spore density,and species richness of AM fungi showed variations among different road types,although the patterns were not clearly evident.A total of 20 species of AM fungi belonging to 8 genera were identi-fied in the soil of six road plots.Acaulospora was the dominant genus,and the number of species in each plot was between 10 and 15.Lead contamination significantly affected the spore density of soil AM fungi.In summary,traffic was an important factor leading to the accumulation of lead in roadsoil,which in turn caused the absorption of lead by avenue camphor trees.At the same time,soil AM fungi were also affected by lead pollution.Scientific management and remediation of soil lead pol-lution is of great significance to ecological environment protection and human health.
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