where C plant and C sediment are the concentrations of a particular heavy metal in the
plant and sediment, respectively; C st em , C leaf and C r oot are the concentrations of a
particular heavy metal in the stem, leaf and root, respectively.
Pearson correlation analysis was applied to examine the relationship among
heavy metals in the surface sediment. Linear regression analysis was conducted to
examine the correlation between concentration and sediment depth. One-way
analysis of variance (ANOVA), followed by Tukey's test for pair-wise comparisons,
was used to compare the concentrations of heavy metals in different plant organs
of each plant species. Statistical analyses were performed using sof tware SPSS 20.0
for Windows.