Abstract
Seasonal changes in the content of 137Cs in soils were studied at three forest ecosystems in the territory of the Chernobyl exclusion zone. The soils were selected layer by layer: A0l, A0f+A0h, 0-5 and 5-10 cm with the frequency of once every two weeks during 2013-2015. Intermittent changes in the levels of the specific activity of 137Cs in all studied soil layers during the calendar year were recorded at the sites. The dependences of the content of 137Cs in different soil layers on the season of the year have not been identified. The calculation of correlation coeffi cients indicates the existence of a relationship between fluctuations in the concentration of radiocaesium only between layers of 0-5 and 5-10 cm. Air temperature and precipitation over different time intervals preceding the sampling do not affect the redistribution of 137Cs in the soil of the forest ecosystems. It has been suggested that the absence of seasonal patterns of changes in the content of 137Cs in soils is associated with its heterogeneity (different amounts of soil biota in each sample).
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