关键词: 生物富集系数, 转运系数, 植物修复, 滇西北小檗(Berberis johannis), 高原城市, 林芝市

Abstract: Three typical shrub species:Lonicera tangutica, Rosa omeiensis, and Berberis johannis,were selected for study in Linzhi City, Xizang, which was regarded as a typical plateau urban area. The concentrations of Cd, Cr, Cu, Pb, Zn, and Hg in both leaves and fine roots were determined. By combining rhizospheric soil pollution assessment with analysis of the bioconcentration factor (BCF) and translocation factor (TF), the heavy metal accumulation characteristics of these shrubs were systematically evaluated. The results indicated that Cd (P_i = 30.88) and Hg (P_i = 4.50) in the rhizospheric soil were severely contaminated, while Cr and Zn were the major accumulated elements. Berberis johannis exhibited a significantly higher accumulation capacity for Cr and Zn compared to the other species. The Cr content in its leaves (112.44 mg/kg) and the Zn content in its fine roots (106.29 mg/kg) were 1.45 times and 1.44 times the soil background values, respectively. It also showed a strong capacity for Cr translocation (TF = 2.48). The BCF of Lonicera tangutica for Cr suggested its potential for regional remediation, whereas Rosa omeiensis showed weak accumulation capacity for all six elements (BCF< 1). Due to its notable accumulation and translocation characteristics for Cr, Berberis johannis had potential for application in phytoextraction technologies and could serve as a candidate species for remediating Cr contamination in high-altitude cities.

Key words: bioconcentration factor, translocation factor, phytoremediation, Berberis johannis, plateau city, Linzhi City