Screening, Evaluation and Uranium Enrichment Characteristics of Uranium-Accumulating Plants for Different Remediation Types

To investigate the establishment of a screening and evaluation model for enriched plants and their accumulation patterns under different uranium stress concentrations, this study conducted a pot experiment using annual ryegrass （Lolium multiflorum Lam.）, black nightshade（Solanum nigrum L.）, sorghum-sudan grass hybrid （Sorghum bicolor×sudanense）, lablab bean （Lablab purpureus）, as well as model plants red amaranth （Amaranthus cruentus L.） and sunflower （Helianthus annuus）. The experiment included uranium stress concentrations of 50, 100, and 200 mg/kg. Shoot and root dry weights along with U concentrations were measured to calculate U accumulation, bioconcentration factor （BCF）, translocation factor （TF）, and bioconcentration quantity （BCQ）. Based on principal component analysis, screening models for extraction remediation and root enrichment remediation were constructed to comprehensively evaluate the uranium enrichment capacity of each plant and identify dominant species.