TY JOUR TI DISTINCTIVE FEATURES OF HEAVY METALS ACCUMULATION IN THE SOILS OF NORTHEN FOREST-STEPPE OF TYUMEN REGION KW northern forest-steppe KW soil KW vegetation KW heavy metals KW accumulation KW pollution JO Bulletin of KSAU AU Oznobihina, A.O. AU Skipin, L.N. AU Kotchenko, S.G. AU Gaevaya, E.V. AU Zakharova, E.V. PY 2018 IS PB Krasnoyarsk State Agrarian University