Abstract:In order to investigate the potential application of grass seeds in uranium contaminated soil phytoremediation, a set of 24 species were selected to study the grass seeds germination under uranium stress, and pot test was conducted to study the growth and uranium enrichment ability of predominant pastures. The results showed that seven species of grass seeds had a relatively high germination rates under uranium stress condition. The concentration of uranium, less than 50 mg·L-1, had the promotion effect on seed germination rate, while the concentration of uranium, more than 100 mg·L-1, had an obvious inhibition effect. The growth of different species of grass plant was significantly different under different uranium concentration. The enrichment condition of the grasses to uranium in the seedling stage was studied. And the results also showed that Lolium multiflorum had a high pot accumulation rate (10.36 mg uranium per pot) at uranium concentration of 150 mg·kg-1, while Lolium perenne had the highest pot accumulation (3.58 mg uranium per pot) at uranium concentration of 50 mg·kg-1. And L. multiflorum had the highest transfer factor (0.87) at uranium concentration of 100 mg·kg-1, while Sorghum sudanense had the lowest value in each concentration level. In conclusion, different specie grasses can be selected to remediate uranium-contaminated soil according to the soil conditions. This study provided some new biological resources and a theoretical basis for the bioremediation to uranium-contaminated soil.