Screening out of Pb hypertolerant plant species

In order to choose the hypertolerant plants to heavy metals and for the case of phytoremediation in soils polluted by heavy metals, the researches were carried out by using the methods of soil-planting and sand-planting in the greenhouse. Thirty-six species growing on lead zinc tail mining areas have been chosen for the study. The treatment concentration of lead was 400 mg·L^-1. Three indexes, which are chlorophyl content of plant leaves, the plant length and the content of lead in plants, were used as standard to choose Pb tolerant plant species. There are six plant species, i.e. are Vetiveria zizanioides, Schizonepeta fenuifolio, Amaranthus tricolor, Xanthium sibiricum, Sophora japonica, Bidens maximowiciziana, meet jointly the criterion of chlorophyl: Tr/CK＞0.90, plant length: Tr/CK≥1.00 and lead content: Tr＞500 mg/kg, and they could be used for further test of hypertoterant plant polluted by heavy metals.