不同修复类型铀富集植物筛选评价及铀富集特性研究OA

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 mg/kg,100 mg/kg,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.The results showed that under 200 mg/kg DW uranium stress,sorghum-sudan grass hybrid exhibited the highest uranium content in the underground parts(1215.91 mg/kg DW),the highest uranium accumulation amount(1.94 mg),the lowest translocation factor(0.1),and the highest underground bioconcentration factor(6.08),indicating extremely strong uranium root enrichment capacity,followed by ryegrass and black nightshade.Red amaranth and sunflower were suitable for extraction remediation in low to medium uranium-contaminated soils,while sorghum-sudan grass hybrid was applicable for high-concentration uranium-contaminated areas.The comprehensive evaluation for extraction remediation indicated that red amaranth and sunflower scored the highest under low to medium concentrations,while sorghum-sudan grass hybrid scored the highest under high concentrations.In the root enrichment remediation evaluation,sorghum-sudan grass hybrid achieved the highest comprehensive score,followed by ryegrass and black nightshade.In conclusion,red amaranth and sunflower can serve as materials for extraction remediation in low to medium uranium-contaminated soils,while sorghum-sudan grass hybrid is suitable for extraction remediation in high-concentration uranium contamination.sorghum-sudan grass hybrid,ryegrass,and black nightshade have the potential to be used as root enrichment remediation materials for uranium-contaminated soils.This study provides a theoretical basis for the screening and evaluation of plants for uranium-contaminated soil remediation.