[System radioecology: modeling of ecological processes and radiation risk assessment].

The background and tasks have been formulated of system radioecology as an separate branch of radiation ecology based on the use of a system analysis and mathematical modeling. The need is justified for developing methods of this scientific discipline to assess radiation resistance of natural systems and radioecological risks. Some specific examples are demonstrated of the application of different approaches when analyzing functioning of forest biogeocenoses after acute irradiation and studying impacts of radioactive contamination of meadow ecosystems on humans and biota. Trends of further studies are outlined and focused on the improvement of system radioecology methods combined within the integrated methodology framework.