TY JOUR TI DARK GRAY FOREST SOILS HUMUS STATE OF THE NORTHERN TRANS-URALS KW dark gray forest soils KW Greyic Phaeozem Albic KW humus KW fertility KW variability KW spatial heterogeneity KW soil for-mation JO Bulletin of KSAU AU Kayugina, S.M. AU Eremin, D.I. PY 2022 IS 0 PB Krasnoyarsk State Agrarian University