Поступление 137Cs в почву из луговых растений при аэральном загрязнении и формирование первичных градиентов концентраций этого поллютанта в почве на агрегатном уровне

Abstract

In model experiments under field conditions in the Aleksandrovsky district of the Vladimir region, the intake of 137Cs from various meadow plants into soddy-podzolic heavy loamy soil was studied. The radionuclide in the form of an aqueous solution of cesium nitrate was applied to the leaf surface of the middle tier, which prevented 137Cs from entering the soil. Representatives of different families were used as experimental plants: common cuff (Alchemilla vulgaris L.), rosaceae family; forest angelica (Angelica sylvestris L.), celery family; caustic buttercup (Ranunculus acer L.), ranunculaceae family; common tansy (Tanacetum vulgare L.), aster family and meadow timothy (Phleum pratense L.), bluegrass family. The experimental results showed that 2.7 to 6.9% of the applied radiocesium can enter the soil through root secretions, and the largest amount of the pollutant was found in the soil of varieties with forest angelica, the smallest – with common tansy. 137Cs entering the soil accumulated mainly in the uppermost 0 to 4 cm horizon; in the underlying layers of 4 to 12 cm radiocesium was found 1.2 to 6.7 times less. At the aggregate level, 137Cs concentrated mainly on the surface of the smallest soil particles, which were <0.5 and 0.5 to 1 mm in size.