Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, China; Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes, Xining, Qinghai 810008, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, China; Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes, Xining, Qinghai 810008, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Ecotoxicol Environ Saf. 2018 Dec 30;166:345-353. doi: 10.1016/j.ecoenv.2018.09.110. Epub 2018 Oct 1.
Environmental quality of the northeastern Qinghai-Tibet Plateau has attracted more attention due to increasing anthropogenic disturbance. Therefore, this study investigated the distribution, pollution, ecological risks, and bioaccumulation of 12 target heavy metals and 16 rare earth elements (REEs) in soils of this area. The average concentrations of target trace elements in soils ranged from 0.16 (Hg) to 500.46 (Cr) mg/kg. Pb caused more serious pollution than the other elements based on geo-accumulation index evaluation. Hg exhibited the strongest enrichment feature with the average enrichment factor of 8.41. Compare with modified contamination degree and pollution load index, Nemerow pollution index method obtained the most serious evaluation results that 45.67% and 16.54% of sampling sites possessed high and moderate pollution. Evaluation results of potential ecological risk index showed that trace elements in soils posed very high and considerable ecological risks in 34.65% and 7.09% of sampling sites, respectively. Mining area was the region with the most serious pollution and ecological risks. Average bioaccumulation factor (BCF) values of target trace elements ranged from 0.05 (REEs) to 2.67 (Cr). Cr was the element that was easier to bio-accumulate in plants of the study area than the other target elements. It is in urgent need to take effective measures for controlling current pollution and potential ecological risks of trace elements in soils of the northeastern Qinghai-Tibet Plateau.
由于人为干扰的增加，青藏高原东北部的环境质量受到了更多关注。因此，本研究调查了该地区土壤中 12 种目标痕量金属和 16 种稀土元素（REEs）的分布、污染、生态风险和生物积累情况。土壤中目标微量元素的平均浓度范围为 0.16（汞）至 500.46（铬）毫克/千克。基于地积累指数评价，铅比其他元素造成了更严重的污染。汞具有最强的富集特征，平均富集因子为 8.41。与修正的污染程度和污染负荷指数相比，内梅罗污染指数法得到了最严重的评价结果，即 45.67%和 16.54%的采样点具有高和中度污染。潜在生态风险指数的评价结果表明，土壤中的微量元素在 34.65%和 7.09%的采样点分别具有很高和相当大的生态风险。矿区是污染和生态风险最严重的地区。目标痕量元素的平均生物积累系数（BCF）值范围为 0.05（REEs）至 2.67（铬）。铬是研究区植物中比其他目标元素更容易生物积累的元素。迫切需要采取有效措施控制青藏高原东北部土壤中痕量元素当前的污染和潜在生态风险。
