Kuznetsova Nina F. RussiaVoronezhAll-Russian Research Institute of Forest Genetics, Breeding and Biotechnology, 105 Lomonosov St., Voronezh 394087, Russiacandidate of biological sciencesekogenlab@gmail.com Author's articles Droughts in the Forest-Steppe Zone of Central Chernozemic Region and Criteria for Evaluation of their Intensity