Accumulation ability of Zizania latifolia, Acorus calamus, Phragmites australis for cu2+ in water body

Cu is the most common heavy metal contaminant in the environment. The engineering and technology of construct wetland have been used to control the pollution of water due to its economy and efficiency and the hydrophytes were the most important constituents of construct wetland. In April, 2011, Cu²⁺ accumulation content in different parts of Zizania latifolia, Acorus calamus, Phragmites australis were investigated based on hydroponic experiments of different Cu²⁺ concentration solutions in the study, and the concentrations of Cu²⁺ of the water body were 0mg/L, 10mg/L, 30mg/L, 80mg/L, 150mg/L and 200mg/L, respectively. The results showed that there were significantly differences among three wetland plants and among of Cu²⁺ concentration for above-ground parts and under-ground of Zizania latifolia, Acorus calamus, Phragmites australis. Cu²⁺ contents in above-ground and under-ground parts of the three wetland plants increased with the Cu²⁺ concentrations of hydroponic solution, and has significantly positive correlation between Cu²⁺ contents and concentrations of hydroponic solution. There was significantly difference in Cu²⁺ contents among the three wetland plants under all Cu²⁺ concentrations of hydroponic solution. Zizania latifolia formed the greatest accumulation ability because the Cu²⁺ concentration in above-ground parts and under-ground of Zizania latifolia was highest than other wetland plants. Zizania latifolia, Acorus calamus, Phragmites australis can been selected to application on phytoe-mediation of water polluted by heavy metal due to the excellent Cu²⁺ accumulation ability of them under the Cu²⁺ concentration especially the Zizania latifolia.