In the article the data on 137Cs accumulation in meadow ecosystems plants of radioactive contaminated areas of Bryansk, Gomel and Chernigov regions are provided. The researches were conducted in 2013 within landscapes of Iput, Desna, Snov, Dnieper river valleys. It is proved that meadow plants of various species and ecological groups from communities of various syntaxons show different abilities to accumulate radionuclides. High 137Cs specific activity is noted for plants of genus Carex. Plants of ass. Festucetum arundinaceae are characterized by low intensity of 137Cs accumulation. Practical value of researches is connected with the necessity to solve the problem of pure forages production for needs of animal breeding. The comparative analysis of the radionuclide content in dry phytomass on each of investigated areas is made. It is found out that in Bryansk region radionuclide specific activity exceeds the control level of the radionuclide content in hay for the Russian Federation (600 Bq/kg). In Gomel region the hay made on floodplain meadows meets acceptable level of 137Cs in hay in Belarus (1300 Bq/kg). 137Cs pollution density of soils of investigated communities in Chernigov region of Ukraine is low, and the radionuclide content in dry phytomass does not exceed permissible levels.

Examine the contents of the elements of the group of heavy metals in samples 18 meadow plant species and soil basal space. In soils root space is determined by significant fluctuations of total concentrations of heavy metals. Identified accumulative opportunities meadow species relative to the TM in natural meadows in the conditions of high technogenic load. Based on the coefficients of accumulation established types of «indicators» and «exclusive», which can be recommended as effective phytoremediation. For grassland species confirmed the species specificity of accumulative opportunities plants relative to the TM: Filipendula ulmaria, Scirpus sylvaticus (гигрофитные виды), Agrostis tenuis и Helichrysum arenarium. Hygrophytic species of floodplain meadows, xerophytic species in dry accumulate chemical elements the same, regardless of the geographical location of meadow ecosystems. For these plants is characterized by the accumulation of mobile essential elements strontium, copper, manganese.

The results of the geobotanical research of the flood-plain meadows of the Iput’ river valley within Bryansk (Russia) and Gomel (Republic of Belarus) regions. The syntaxonomy of the flood-plain meadows is developed. The transformation of the syntaxa into the types of feeding grounds is realised.

The results of the geobotanical research on Desna-river flood-plain on the line Bryansk-Belaya Berezka are done. The new association Ulmo minoris–Quercetum roboris is established.

The results of the botanico-geographical zoning of the Bryansk region are done. The borders of subzones and bands are established on the base of the floristic and phytosociological criteries. All the chorological units are established on the base of the data on the distribution and composition of zonal, eztrazonal and azonal-zonal units of the ranges of alliance or association and geographical elements of flora.