Medžio lajos ir šaknų įtaka dirbtinės kilmės radionuklido 137Cs pasiskirstymui dirvožemyje

Abstract

Since the Chernobyl nuclear reactor accident, forests have accumulated about 20-30% of the bulk transportable radioactive dust [1,2]. 40-90% of 137Cs was hold by tree crowns, and the remaining part deposited in the underbrush. The magnitude of accumulation in trees depends on the density of their crowns, plant species, climatic conditions, and chemical and physical compositions of soil [3]. 80 % of radionuclides retained by tree crowns are transferred into the lower layer of the forest already within 1-2 months, but the complete purification of a crown lasts up to three years [3]. The most important processes of vertical 137 Cs migration in soil are diffusion, convective transfer, and migration in the root systems of plants. Therefore, accumulation of radionuclides in trees provides some insight into soil contamination.