Broadley M R, Willey N J
Faculty of Applied Sciences, University of the West of England, Coldharbour Lane, Frenchay, Bristol BS16 1QY, UK.
Environ Pollut. 1997;97(1-2):11-5. doi: 10.1016/s0269-7491(97)00090-0.
The concentration of Cs was measured in the shoots of 30 taxa of plants after exposing the roots for 6 h to 0.1 microg radiolabelled Cs g(-1) soil. There were maximum differences between Chenopodium quinoa and Koeleria macrantha of 20-fold in Cs concentration and 100-fold in total Cs accumulated. There was a weak relationship between Rb (K) and Cs concentration across the 30 taxa, but a strong relationship within the Gramineae and Chenopodiaceae. Taxa in the Chenopodiaceae discriminated approximately nine times less between Rb and Cs during uptake than did those in the Gramineae. The lowest Cs concentrations occurred in slow growing Gramineae and the highest in fast growing Chenopodiaceae. If radiocaesium uptake by the Chenopodiaceae during chronic exposures shows similar patterns to those reported here after acute exposure, then the food contamination implications and the potential for phytoremediation of radiocaesium contaminated soils using plants in this family may be worth investigating.
将30种植物的根系在含有0.1微克放射性标记铯（每克土壤）的环境中暴露6小时后，测定其地上部分铯的浓度。藜麦和大穗鹅观草之间铯浓度的最大差异为20倍，积累的总铯量差异为100倍。在这30个分类群中，铷（钾）与铯浓度之间的关系较弱，但在禾本科和藜科内部关系较强。藜科分类群在吸收过程中对铷和铯的区分能力比禾本科分类群弱约9倍。铯浓度最低的是生长缓慢的禾本科植物，最高的是生长迅速的藜科植物。如果藜科植物在长期暴露期间对放射性铯的吸收模式与这里报道的急性暴露后模式相似，那么该科植物对食物污染的影响以及利用其对放射性铯污染土壤进行植物修复的潜力可能值得研究。
