河南某矿区周边优势植物重金属富集特征及其药用健康风险评价

Heavy metal enrichment characteristics and medicinal health risk assessment of dominant plants around a mining area in Henan Province

  • 摘要: 筛选适宜矿业废弃地生长的药用植物并评价其重金属富集能力及药用风险,以实现在降低矿区重金属污染风险的同时提高土地利用效率。选取河南某矿区坡顶位置自然生长的9种优势药用植物,对整株植物及0~10 cm根际土进行采集,应用转运系数、生物富集系数、危害商法及人体健康风险评估模型开展分析,研究各植物对9种重金属的富集和转移特性,探讨药用植物对人体潜在的健康风险。结果表明:植物根际土壤中Cd、As有效态占比超过20%,存在中等风险;小飞蓬(Conyza canadensis)中As、Cu元素含量较高,白茅(Imperata cylindrica)、小飞蓬及狗尾草(Setaira viridis)中的Cr、Ni元素含量较高,白茅、小飞蓬及金银花(Lonicera japonica)中Pb元素含量较高;金银花还对土壤中Cd、As、Cu、Pb、Hg、Ag等元素有较强的吸附能力,艾草(Artemisia argyi)对Cr元素富集能力强,同时艾草及金银花重金属富集量对人体危害程度较低;小飞蓬、五节芒(Miscanthus floridulus)对土壤中Cd、As、Cu、Pb、Hg、Ag等重金属的吸附及转运能力较强,但其对人体健康风险较大;猪毛菜(Salsola collina)、盐肤木(Rhus chinensis)对Cd、As、Cu、Pb、Hg、Ag等重金属的吸附及转运能力较弱,对重金属具有耐受性,属于重金属低蓄积量植物。在今后研究及生态建设中,需要针对具体目的选择适宜的植物进行栽培及修复。

     

    Abstract: Screening medicinal plants suitable for growth in abandoned mining areas and evaluating their heavy metal enrichment ability and medicinal risks can provide the scientific basis for reducing the risk of heavy metal pollution in mining areas and improving land use efficiency. Nine dominant medicinal plants naturally growing at the top of the slope of a mining area in Henan Province were selected, and the whole plants and rhizosphere soil of 0-10 cm were collected. Using transport coefficient, bioenrichment coefficient, hazard quotient method and human health risk assessment model, the enrichment and transfer characteristics of each plant to the nine heavy metals were analyzed, and the potential health risks of medicinal plants to the human body were studied. The results showed that the proportion of available Cd and As in the rhizosphere soil was more than 20%, indicating a moderate risk. The contents of As and Cu were higher in Conyza canadensis; the contents of Cr and Ni were higher in Imperata cylindrica, Conyza canadensis and Setaira viridis; the contents of Pb were higher in Imperata cylindrica, Conyza canadensis and Lonicera japonica. Artemisia argyi had a strong enrichment ability of Cr, and Lonicera japonica had a strong adsorption ability of Cd, As, Cu, Pb, Hg, Ag and other elements in the soil. At the same time, Artemisia argyi and Lonicera japonica had a low degree of harm to the human body. Conyza canadensis and Miscanthus floridulus had a strong adsorption and transport ability of Cd, As, Cu, Pb, Hg, Ag and other heavy metals in soil, but they had great risks to human health. Salsola collina and Rhus chinensis had a weak adsorption and transport ability of heavy metals such as Cd, As, Cu, Pb, Hg, Ag, and they were tolerant to heavy metals, so they belonged to plants with low accumulation of heavy metals. In the future research and ecological construction, it was necessary to select suitable plants for cultivation and restoration for specific purposes.

     

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