摘要
[目的]筛选适合污染区生长的超积累植物。[方法]采用野外采样法,以国内某核设施退役厂放射性污染区域为研究对象,测定了该区优势植物(共9科17种)和土壤中的^(137)Cs、^(90)Sr放射性含量,并进行了筛选与田间修复试验。[结果]污染区土壤^(137)Cs和^(90)Sr放射性含量的最大值分别为5.06×10~6和3.29×10~4Bq/kg,均超过国际规定活度限值;菊科串叶草对^(137)Cs的富集和转移系数均小于1.00,而对^(90)Sr的富集和转移系数分别是3.25和2.95,均大于1.00;串叶草具备^(90)Sr超积累植物特征且能修复土壤中5.9%的^(90)Sr,可推荐串叶草对^(90)Sr的污染土壤进行修复处理。[结论]首次发现并证实菊科串叶草是一种^(90)Sr超积累植物,为开展污染区域修复治理工作提供参考。
[ Objective ] The aim was to screen out hygrophyte with hyperaccumulator properties which could grow in pollution area. [ Method] The field sampling method was adopted. On the basis of a nuclear facility decommissioning domestic factory, the content of 137 Cs and 9oSr was determined in both dominant species （17 species, 9 families） and soil in polluted areas, and dominant species screening and phytoremediation tests were carried out. [ Result] It was demonstrate that Silphium peoColiatum was a kind of 9oSr-hyperaccumualtor, and the maximum contents of 137Cs and 9oSr were 5.06 ~ 106 Bq/kg and 3.29 ~ 104 Bq/kg respectively, which were both above the maximum values of international regu- lations. The screening tests indicated that the enrichment and the transfer coefficience to ~37Cs of Silphium peoColiatum were both below 1.00, while the coefficience to 9oSr were 3.25 and 2.95 respectively, which were both above 1.00. Silphium peoColiatum had the characteristic of 9oSr-hyperaccumualtor and was able to remedy 5.9% of 9oSr in the soil. [ Conclusion] So Silphium perfoliatum can achieve the phytoremedi- ation of contaminated soil with 9oSr, which can provide reference for the repair work of pollution area.
出处
《安徽农业科学》
CAS
2017年第24期4-8,18,共6页
Journal of Anhui Agricultural Sciences
基金
国家自然科学基金重点项目(4163000426)
四川省应用基础研究计划项目(2014JY0206)
西南科技大学研究生创新基金项目(16ycx002)
关键词
铯-137
锶-90
放射性污染
植物修复技术
富集性能
137 Cs
9o Sr
Radioactive contamination
Phytoremediation technology
Enrichment of performance
