GEOCHEMICAL FEATURES OF POST-PYROGENIC CHANGES OF POLISSYA SOILS (LOW FIRE)

Geochemical post-pyrogenic soil changes are one of the most important factors in determining state forest ecosystem. For first time content microelements (Hg, As, Ba, Mg, Mn, Mo, Cd, Co, Cr, Cu, Pb, Zn, V, Ni) sod-podzolic soils under pine Zhytomyr Polissya (Ukraine) was determined by ICP-MS method. The study is based on a comparison trace elements background area and burnt areas (grassland fire 2019). analysis profile burned to depth 10 cm (after 1 cm) set limit - 3-5 (humus-eluvial horizon), after which you can record accumulation or scattering surface. By calculating percentage change (relative soils), intensive (more than 20%) Ni, V moderate (up 10%) Cr Hg, Mn. increase pH (from 4.2 7.5) determined, spatial map-schemes were constructed, due direction revealed from south-east north-west. ionic forms metals (Cu, Mn) solution at different values 4 8 with step 0.2) modeled (PHREEQC program) current trend revealed: Pb linear dependence, Mn polynomial. limits calculated, where there free that enter plants: 3.9-8.2; Zn 5.5-7.5; Cu 5-8.2; 5-11.5. post-fire transformation revealed, expressed (before 4.2-4.8; 6.5-7.2; year 4.5-5.5). obtained results confirmed need for geochemical monitoring ecosystem restoration plant biodiversity.