TY JOUR TI CONDITION CHANGE TRENDS DIAGNOSTICS OF SOIL FORMATION IN THE SELENGA RIVER DELTA DURINGHOLOCENE PERIOD ON CARBONHUMIC ACIDSTO CARBON FULVIC ACIDSCORRELATION KW delta KW soils KW soil formation KW humus KW carbon KW humicacids KW fulvic acids JO Bulletin of KSAU AU Makushkin, E.O. PY 2012 IS PB Krasnoyarsk State Agrarian University