Khakunova Elena M. RussiaNalchikInstitute of Ecology of Mountain Territories of Russian Academy of Sciences, 37a I. Armand Str., Nalchik 360000, Russiaecology_lab@mail.ru Author's articles BIOLOGICAL ACTIVITY OF MOUNTAIN AND PLAIN CHERNOSEM SOILS IN THE CENTRAL CAUCASUS (WITHIN KABARDINO-BALKARIA)