六种水培的苋科植物对~(134)Cs的吸收和积累(英文)

对营养液栽培 42d后的 6种苋科植物用不同13 4 Cs比活度处理 ,1周后收获并分析13 4 Cs比活度。结果表明 ,不同植物组织的烘干重和最大生长高度存在差异。不同植物和同种植物不同器官间13 4 Cs积累量表现为显著差异 ,但差异取决于初始加入到营养液中的13 4 Cs比活度。放射性自显影结果表明 ,各种植物叶片积累的13 4 Cs比根茎积累的多。籽粒苋 (AmaranthuscruentusL .)较其它植物生物量高、根系密度大、生长速率快 ,虽然籽粒苋中13 4 Cs比活度较低 ,但其茎叶器官从13 4 Cs水培液中剔除的13 4 Cs明显高得多 ,且表现出很高的13 4 Cs去除速率。研究还发现 ,6种植物叶部含钾量与13 4 Cs比活度之间存在较弱的线性相关性。

UPTAKE AND ACCUMULATION OF ~(134)Cs BY SIX PLANT VARIETIES FROM THE AMARANTHACEAE GROWN IN NUTRIENT SOLUTION

Six plant varieties of the Amaranthaceae grown for 42 days in a nutrient solution were treated with different 134Cs activities. Plants were harvested 7 days after treatment and analyzed for 134Cs activities. The results show that there is a difference in plant tissue dry weight and maximum weight among varieties, and that there exist great differences in plant uptake of 134Cs applied to the nutrient solution between and within the plant varieties, depending on the initial 134Cs activity. The leaves of all varieties accumulated much more 134Cs than other plant organs as shown by the radiographic images. Bioaccumulation coefficients varied for different varieties with different treatments of 134Cs. Although A. cruentus L. with high biomass, high density of roots, and high growth rate had a lower activity of 134Cs than the other five species, which had comparatively low biomass, low density of roots, and low growth rate, its mean total activities of 134Cs removed in shoots was higher, providing a high removal rate. It is also found that there is a weak correlation between K concentration and 134Cs distribution in the leaves of all six-plant varieties.