The uptake of Cs and Sr from soil to radish (Raphanus sativus L.)- potential for phytoextraction and remediation of contaminated soils

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• 作者：Dan Wang^a ; ^b ; ^{wangdan@swust.edu.cn} ; Fangping Wen^a ; Changhe Xu^a ; ^b ; Yunlai Tang^a ; Xuegang Luo^b
• 关键词：Radish ; Uptake ; Accumulation ; 133Cs ; 88Sr ; Phytoextraction
• 刊名：Journal of Environmental Radioactivity
• 出版年：2012
• 出版时间：August, 2012
• 年：2012
• 卷：110
• 期：Complete
• 页码：78-83
• 全文大小：529 K

文摘

The ¹³³Cs and ⁸⁸Sr uptake by plant Raphanus sativus L. was studied during cultivation in outdoor potted-soil. The distribution, accumulation of ¹³³Cs, ⁸⁸Sr and the antioxidant responses in plants were measured after 30 and 60 days of cultivation. The results showed that the uptake capacity of radish for ⁸⁸Sr was far?higher than that for ¹³³Cs when the concentration of ⁸⁸Sr was as the same as that of ¹³³Cs in the soil (The?concentration of ⁸⁸Sr or ¹³³Cs in the soil was from 2.5?mg?kg^? to 40?mg?kg^?). The highest ⁸⁸Sr accumulation was 239.18?¦Ìg?g^??dw, otherwise, the highest ¹³³Cs accumulation was 151.74?¦Ìg?g^??dw (The?concentration of ⁸⁸Sr in the soil was 40?mg?kg^?), and the lowest ⁸⁸Sr accumulation was 131.03?¦Ìg?g^??dw, otherwise, the lowest ¹³³Cs accumulation was 12.85?¦Ìg?g^??dw (The?concentration of ⁸⁸Sr in the soil is 5?mg?kg^?). The ⁸⁸Sr and ¹³³Cs TF values were 1.16-1.72 and 0.24-0.60, respectively. There was little influence of high concentration of ⁸⁸Sr on the total biomass of plants, so the radish is one of the ideal phytoremediation plant for Sr polluted soils. The important physiological reasons that radish had good tolerance to ⁸⁸Sr stress were that the MDA content was higher under the ⁸⁸Sr stress than that under the ¹³³Cs stress, and the activities of POD and CAT were lower under the ⁸⁸Sr stress than that under ¹³³Cs stress.