TY JOUR TI AGROCHEMICAL PROPERTIES OF SOILS UNDER DIFFERENT FOREST VEGETATION TYPES IN CENTRAL YAKUTIA KW forest soils; agrochemical properties; humus; nitrogen; phosphorus; potassium; forest vegetation types; Central Yakutia; permafrost JO INTERNATIONAL AGRICULTURAL JOURNAL AU Fedorov, A.Y. AU Nikolaeva, F.V. AU Ivanov, A.A. PY 2026 IS 9 PB Electronic science