摘要
分析研究了某铀尾矿区植物资源,并对这些植物的铀积累作用进行了研究。结果显示,该尾矿区污染土壤上植物群落较简单,共有高等植物31种,隶属12科,其中:禾本科最多,12种;其次是菊科植物,5种;凤尾蕨科和莎草科植物各3种;其他科各1种。1年生或多年生草本植物有28种,占总数的90.3%,其他3种为灌木或小乔木。对这31种植物进行了铀含量测定,结果发现,铀富集量在200mg/kg以上的植物有14种,占总数的45%,其中富集量在600mg/kg以上的有3种,分别是水莎草、牧草、小飞蓬。植物体内铀迁移系数大于1的有9种,其中燕麦、牧草、鼠曲草、青蒿中铀的迁移系数较大。这31种植物中,可考虑将水莎草、牧草作为超富集植物应用于铀污染土壤的修复,小飞蓬、盐肤木、枸骨、燕麦、鼠曲草、碎米莎草、龙葵等对铀污染土壤的修复具有潜在应用价值,可进一步研究。
In this study ,the plant resources and their accumulation of uranium element w ere analyzed in certain uranium tailings area ,in China .T he results show that the plant community are relatively simple in the soils polluted by uranium tailings ,in w hich there are only 31 species of higher plants ,belonging to 12 families ,including 12 species of gramineae plants , 5 species of compositae plants , 3 species of pteridaceae plants , 3 species of cyperaceae plants ,and 1 specie in every other family .There are 28 species of annual or perennial herbs ,accounting for 90.3% ,and 3 species of shrubs or small trees in this flora .The uranium contents in these 31 plants were also determined .Ura‐nium contents in 14 species of plants ,accounting for 45% ,are above 200 mg/kg .Of note ,uranium content is more than 600 mg/kg in 3 species of plants ,which are the w ater sedge ,phleum alpinum and conyza canadensis ,respectively .T he T F of uranium is more than 1 in 9 species of plants ,among w hich the T F of uranium of toats ,phleum alpinum ,gnaphalium and southernwood is higher than that of the others . In these 31 species ,water sedge and phleum alpinum can be used as hyperaccumulating plants in phytoremediation of uranium contaminated soils .The conyza canadensis ,rhus chinen‐sis ,ilex cornuta ,oats ,gnaphalium ,cyperus iria ,and solanum nigrum ,as the potential plant species for phytoremediation of uranium contamination in soils ,are necessary for the further study .
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2014年第11期1954-1959,共6页
Atomic Energy Science and Technology
关键词
植物组成
超富集植物
铀
植物修复
plant composition hyperaccumulating plant uranium phytoremediation
