Characteristic of consortiums and ecological conditions of Betula pendula Roth coenopopulations habitats

The structure of consortiums of Betula pendula Roth of various biological age is characterized. Research of ecological parameters of coenopopulations habitats of birch in phytocoenoses of Mari El Republic is conducted. Change of specific diversity and relative abundance of Insecta and Arachnida in Betula pendula kroner in an urban environment is revealed.