As known, the exchangeable form Cd is easily absorbed by plant. In the presence of vegetation, the
exchangeable form Cd was partly removed by plant uptake that accompanied with the intake of nutrition
(Zhang et al. 2009).
Cd-hyperaccumulating plant species, are almost the only ones that can grow in soil solutions containing
Cd concentrations as high as 35 μmol/L (3.9 mg/L) (Brown et al., 1994; Xiao et al., 2008).