TY JOUR TI AGRICULTURAL LAND COLONIZATION BY TREE VEGETATION KW agricultural land KW tree vegetation KW structure KW composition KW morphological characteristics KW succession JO Bulletin of KSAU AU Varaksin, G.S. AU Vais, A.A. AU Baikalov, E.M. PY 2012 IS 0 PB Krasnoyarsk State Agrarian University