A large area phytoremediation experiment to study the uptake of metals by twelve plant species growing in the contaminated site of central taiwan

摘要

A 1.3 ha of Cr, Cu, Ni, and Zn contaminated site in the central Taiwan was used to study the feasibility of phytoextraction. Based on the results of a pre- experiment at the site, 12 plant species were selected from 33 plant species and further used for a large area phytoremediation experiment at the site. Comparing with the initial plants before planting, most plant species significantly accumulated higher Cr, Cu, Ni, and Zn in their shoots after growing in this contaminated site for 33 d. Among the 12 plant species, those plants that accumulated higher concentrations of metals in their shoot were Garden canna and Garden verbena(in the levels of 45-60mg (Cr)·kg<'-1>), Chinese ixora and Kalanchoe (30mg (Cu)·kg<'-1>), rainbow pink and sunflower (30mg (Ni)·kg<'-1>), and French marigold and sunflower (in the levels of 300-470mg (Zn)·kg<'-1>), respectively. Results of two times of large area phytoremediation experimental demonstrate that phytoextraction is a feasible method to re-use those metalscontaminated soils in central Taiwan.