[Cu and Pb contents in Dichondra repens leaf and their effects on its physiological indexes]

This paper analyzed the contents of Cu and Pb in Dichondra repens grown on Cu and Pb contaminated soil to determine if this plant is a hyperaccumulator of two elements. The results indicated that total content of Cu (44.8 g x kg(-1)) in the plant was higher than that of Pb (25.59 g x kg(-1)), and the contents of two elements were higher in roots and stems than in leaves and increased with increasing soil contamination. The accumulation coefficient of Cu (0.784) was higher than that of Pb (0.465). With the increasing concentrations of two heavy metals, the chlorophyll a content and chlorophyll a/b ratio in leaf decreased, the SOD activity increased to the peak and decreased subsequently, while the POD activity always maintained an increasing trend. The membrane permeability of cell was not significantly varied.