Comparative analysis of soil ecosystems of protected and artificially created beech forests by Tsarenko, P.M., Zaimenko, N.V., Demchenko, E.M., Mikhailyuk, T.I., Didyk, N.P., Ellanska, N.E., Kharitonova, I.P., Benderychek, T.Yu., Melnyk, V.I.