Abstract:
In this study, the plant resources and their accumulation of uranium element were analyzed in certain uranium tailings area, in China. The results show that the plant community are relatively simple in the soils polluted by uranium tailings, in which there are only 31 species of higher plants, belonging to 12 families, including 12 species of gramineae plants, 5 species of compositae plants, 3 species of pteridaceae plants, 3 species of cyperaceae plants, and 1 specie in every other family. There are 28 species of annual or perennial herbs, accounting for 90.3%, and 3 species of shrubs or small trees in this flora. The uranium contents in these 31 plants were also determined. Uranium contents in 14 species of plants, accounting for 45%, are above 200 mg/kg. Of note, uranium content is more than 600 mg/kg in 3 species of plants, which are the water sedge, phleum alpinum and conyza canadensis, respectively. The TF of uranium is more than 1 in 9 species of plants, among which the TF of uranium of toats, phleum alpinum, gnaphalium and southernwood is higher than that of the others. In these 31 species, water sedge and phleum alpinum can be used as hyperaccumulating plants in phytoremediation of uranium contaminated soils. The conyza canadensis, rhus chinensis, ilex cornuta, oats, gnaphalium, cyperus iria, and solanum nigrum, as the potential plant species for phytoremediation of uranium contamination in soils, are necessary for the further study.