施用微量元素对菊苣修复铀污染土壤的影响

发布时间：2019-03-17 16:31

【摘要】：为了探究施用微量元素对植物修复铀污染土壤的影响,在0、50、100、150 mg·kg~(-1)铀污染土壤中,分别单独施用土壤背景值含量0、1倍和5倍的Mn、Zn、Cu、Mo、B,并测定菊苣实生苗和再生苗植株干重、植株铀含量和铀富集量。结果表明,在铀污染土壤中单独施用Mn、Zn、Cu、Mo、B后,降低了菊苣实生苗植株干重,也降低再生苗植株干重(Zn除外)。在50、100 mg·kg~(-1)铀污染土壤中,每千克土壤施用50 mg B,平均增加菊苣实生苗植株铀含量129.8%,平均增加菊苣实生苗植株铀积累量77.0%;在50 mg·kg~(-1)铀污染土壤中,每千克土壤施用50 mg B,增加菊苣再生苗植株铀含量80.1%,增加再生苗植株铀积累量17.87%。因此,在中低浓度铀污染土壤,施用适量的B肥,可以提高菊苣植株铀含量和铀积累量。本研究为提高铀污染土壤的植物修复效率提供了理论依据。
[Abstract]:In order to investigate the effect of trace element application on phytoremediation of uranium contaminated soil, the background values of 0,50100150 mg kg~ (- 1) and 5 times Mn,Zn,Cu,Mo,B, were applied separately in 0,50100150 Mn,Zn,Cu,Mo,B, (- 1) contaminated soil. The dry weight, uranium content and enriched amount of uranium in the seedlings and regenerated seedlings of chicory were determined. The results showed that single application of Mn,Zn,Cu,Mo,B in uranium-contaminated soil decreased the dry weight of the seedlings of chicory, but also decreased the dry weight of the regenerated seedlings (except Zn). In 50100 mg kg~ (- 1) uranium-contaminated soil, 50 mg B application per kg of soil increased the average uranium content by 129.8% and the average uranium accumulation by 77.0% in the seedling plants of chicory (chicory) and in the soil polluted by uranium (- 1). In 50 mg kg~ (- 1) uranium contaminated soil, 50 mg B was applied per kilogram of soil to increase U content of regenerated plantlets of chicory by 80.1% and U accumulation of regenerated seedlings by 17.87%. Therefore, applying appropriate amount of B fertilizer to the soil polluted by low and low concentration uranium can increase the uranium content and uranium accumulation of chicory plants. This study provides a theoretical basis for improving the phytoremediation efficiency of uranium-contaminated soils.
【作者单位】：西南科技大学农学院;西南科技大学核废物与环境安全国防重点学科实验室;
【基金】：国家核设施退役及放射性废物治理科研重点项目(14ZG6101)
【分类号】：S143.7;X53;X173

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