[Mathematical model of plant accumulation of radionuclides and heavy metals from soil].

Equilibrium model is based on the hypothesis of sorptive mechanisms of absorption of chemical elements in the soil solid phase-soil solution-plant system. The characteristics of the model are in the line with basic experimental relationships: dependence of concentrations of radionuclides or heavy metals in plant on: a) concentration of radionuclides or heavy metals in soil; b) sorptive capacity of plant; c) concentration of macro element-analogue in soil; d) soil fertility. The accumulation of elements by plants depends on ratio of cation capacities of plant and soil as well as the ratio of sorption-desorption of an element in the soil solid phase (plant)-soil solution system.

[137Cs accumulation by grasses from peat soil under increasing amounts of potassium and nitrogen fertilizers]. / Nakoplenie 137Cs travami iz torfianoi pochvy pri vozrastaiushchikh dozakh kaliinykh i azotnykh udobrenii.

The three-chamber model of radionuclides uptake from soil was proposed. This model permit to analyse the transfer factors as the function of the some properties of the radionuclides, macroelement-analogs, soil and plants. The field experiment results (Novozybkov District) was analysed. In this experiment the uptake 137Cs in Bromopsis inermis L. from peat soil under increasing K- and N-fertilizer doses was investigated.

[The ecological cause of the higher accumulation of 90Sr and 137Cs in the food of northern inhabitants]. / Ekologicheskaia obuslovlennost' povyshennogo nakopleniia 90Sr i 137Cs v pishche zhitelei severa.

The higher accumulation of 90Sr and 137Cs in the trophic chains of North inhabitants was analysed. The specific of the higher accumulation is caused by one-sided trend of the typical for North the biotical and abiotical factors.

[The study of interaction between 134Cs and potassium in system peat soil-plant under increasing concentration of macroelement in soil]. / Issledovanie vzaimodeistviia 134Cs i kaliia v sisteme torfianaia pochva-rastenie v usloviiakh vozrastaiushchikh kontsentratsii makroanaloga v pochve.

The interaction between analogous elements K and 134Cs in the system "peat-soil-plant" was investigated. The values of some parameters of sorption model for uptake of radionuclides by plants from soil were determined. An attempt to interpret the processes going on in the studied system under pot experiment from the viewpoint of soil chemistry was done. Two intervals of potassium concentration in peat-soil were displayed, with different effect on 134Cs uptake by plants.