『Abstract
　The organic fraction in soils has a significant influence on heavy metal transport. In this study, the organic carbon content was measured by dry oxidation procedure from 21 Xuzhou urban roadside soils to assess the relationships between the concentrations of heavy metals (Pb, Cu, Zn, and Cr) and the amount of organic carbon. The anthropogenic heavy metals (e.g. Pb, Cu, Zn) were strongly correlated with organic carbon (denoted by Corg-C) extracted by dry oxidation while natural heavy metal (e.g. Cr) showed no correlation to the Corg-C. The anthropogenic heavy metals were also strongly correlated with the amount of the total carbon. These results show that the anthropogenic heavy metals are mainly enriched in the organic matter in the Xuzhou urban roadside soils.

Keywords: Organic carbon; Dry oxidation; Urban roadside soils; Enrichment; Heavy metals』

Introduction
Materials and methods
Results and discussion
　C and N in the studied soils
　Correlation analysis
　Hierarchical clustering analysis
Conclusions
References