Studies On The Phytoremediation Of Green Manures And Flowers In The Soils Contaminated ¹³³ Cs And ⁸⁸Sr

Radioactive contamination has become the problem which was needed to be settled urgently, with the development and application of the nuclear technology. (137)~Cs and (90)~Sr are the common radionuclides. Phytoremediation with economic and high efficient advantages is preferable to other technology. The ten kinds of green manures and the ten kinds of flowers with fast growth, high biomass, strong resistance and easy harvest characteristics were studied in this article. The plants with higher accumulate capability were screened in hydroponic medium contained (133)~Cs and (88)~Sr, and the screened plants were grown in the pot to study the fates of Cs and Sr in the soil-plant system. The main results were shown as follows:(1) In the hydroponic medium experiment, Amaranthus mangostanus L., Vicia faba Linn and Celosia Cristata were screened among the ten kinds of green manures and the ten kinds of flowers for their higher accumulate capability.(2) The (133)~Cs and (88)~Sr contents in the above-grounds and the roots of Amaranthus mangostanus L., Vicia faba Linn and Celosia Cristata were increased with the increasing initial concentration of (133)~Cs and (88)~Sr in the hydroponic medium. The highest ability of (133)~Cs transport was Amaranthus mangostanus L.. The (133)~Cs contents in the above-grounds of Amaranthus mangostanus L. were higher than that of the roots with all (133)~Cs treatments. In the treatments of low concentration, the effects on the growth of the three kinds of plants showed no significant difference and the abilities of (133)~Cs and (88)~Sr transport ranked in the following sequence: Amaranthus mangostanus L.>Vicia faba Linn>Celosia Cristata. In the treatments of high concentration, the growth of those plants were inhibited and the root activities decreased. And the rank of the abilities of (133)~Cs and (88)~Sr transport: Amaranthus mangostanus L.>Vicia faba Linn>Celosia Cristata. The highest ability of the (133)~Cs and (88)~Sr accumulation is Amaranthus mangostanus L.. The accumulate capability of Amaranthus mangostanus L was the highest in the three plants.(3) The (133)~Cs and (88)~Sr contents in the above-grounds and roots of Amaranthus mangostanus L. were increased with the increasing concentration of (133)~Cs and (88)~Sr in the pot experiment which were consistent with the results of the hydroponic experiment. Contrary to the results in the low level treatments, the contents in the above-grounds of Amaranthus mangostanus L.were higher than the roots within the high level treatments. The results showed that the transporting capability of Amaranthu mangostanus L. was higher in the high concentration treatments. The effects of (133)~Cs and (88)~Sr stress on the growth and the physiological characteristics of Amaranthu mangostanus L. in the pot experiment and the hydroponic medium were similar.In conclusion, the hydroponics could be used as the method to screen the accumulator and hyperaccumulator plants. in this experiment, Amaranthus mangostanus L. showed a great potential to remediate the radioactive contaminated soil.