Abstract: Phytoremediation has been proposed due to its characteristics such as in-situ remediation, ease of operation, low cost, and environmental friendliness. The key to phytoremediation technology lies in screening suitable hyperaccumulator plants. This study employed methods including field investigation and sampling, indoor potted plant simulation screening, and field planting experiments to rank the uranium concentration factor (F_V) and translocation factor (f_tr) of candidate plants. The results showed that field investigation and sampling identified Phragmites australis and Themeda caudatahad as having F_V>1, making them potential plants for ecological restoration in severely uranium-contaminated areas. The pot experiment screened six uranium hyperaccumulator plants (F_V>1), namely Bidens pilosa, Abelmoschus esculentus, Eleusine indica, Solanum nigrum, Commelina communis and Lolium perenne, while Amaranthus retroflexus had F_V<1 but f_tr>1. The field planting experiment results indicated that Eleusine indica, Sorghum sudanense and Brassica juncea had F_V>1 and f_tr<1, whereas Arachis hypogaea had F_V<1 and f_tr>1, making them candidates for uranium phytoremediation research. Combining the three methods, a total of ten hyperaccumulator plants for the radionuclide uranium (F_V>1) were identified: Phragmites australis and Themeda caudatahad, Bidens pilosa, Abelmoschus esculentus, Eleusine indica, Solanum nigrum, Commelina communis, Lolium perenne, Sorghum sudanense and Brassica juncea. It is anticipated that future efforts involving genetic engineering, breeding, and related agronomic management techniques will enhance the remediation potential of these ten plants, as well as Amaranthus retroflexus and Arachis hypogaea.

Key words: uranium contamination, phytoremediation, plant soreening, concentration factor, translocation factor