Removal of Cu, Zn, Pb, and Cr from Yangtze Estuary Using the Phragmites australis Artificial Floating Wetlands

Figure 3

Metal concentration of Cu, Pb, Zn, and Cr in the P. australis shoots, roots, and rhizomes in four seasons (values are the means of six replicates ± standard deviation; significant difference between sites (within the same season) is showed by small letter; significant difference between seasons (within the same tissue) is showed by capital letter).