TY JOUR TI CO 2 EMISSION FROM NATURAL LANDSCAPE SOILS OF THE PRIMORYE SOUTH KW soil KW humus KW CO 2 emissions KW catalase activity KW landscape JO Bulletin of KSAU AU Purtova, L.N. AU Kostenkov, N.M. PY 2013 IS PB Krasnoyarsk State Agrarian University