PLANT UPTAKE OF RADIOCAESIUM - POTENTIAL FOR REMEDIATE RADIOPOLLUTED SOILS

摘要

In this work it is studied the impact of some environmental and physiological factors, such as density of sowing, watering, CEC (Cation Exchange Capacity) and presence of AM (Arbuscular mycorrhizal) fungal hyphae, on the plant ability to uptake and accumulate radiocaesium by roots. Five plant species were used: pea, wheat, soybean, barley and oats. The obtained results show that different density of sowing and alteration of the soil moisture lead to a considerable alteration of CEC and of the level of radiopollution for all used plants. It was found that the density of sowing increases both the CEC of plant tissues (leaves and stem) and the total content of ~(137)Cs in plants. Also, soil moisture increases the plant uptake of radiocaesium. Concerning the hyphae of AM fungus, it was found that it can absorb radiocaesium from the soil and transfer this radiopollutant to the plant with the following order of magnitude: soybean > pea > barley > wheat > oats. Moreover, it was observed that plant species can differentiate the ~(137)Cs uptake in all experiments. This study indicates that careful selection of plant species could enhance the perspectives of plant uses to remediate radiopolluted lands.