Floristic composition and structure of soil vegetation cover in pine stands of Moscow

The paper provides an analysis of the floral composition and structure of living ground cover in Moscow pine stands using the example of two sites - the Losiny Ostrov National Park and the Timiryazev Russian State Agricultural Academy Experimental Forest Station. The relevance of the work is due to the increasing anthropogenic impact on urban forests, manifested in changes in the species diversity and structure of the crop. Field studies were conducted on 20 test areas using methods of geobotanical descriptions, Ellenberg scales, the Shannon index and the Jaccard coefficient. It was found that the total projective coverage of the housing and communal services in Losiny Ostrov averages 76%, in the Forest Experimental Station - 51%. The types of the non-moral group prevail. A low similarity of the floral composition between the study objects (Kj = 25.4%) and a relatively low species diversity (Shannon index <1) was revealed, which is due to the varying degree of recreational activity. There are 4 adventitious (including invasive) species that have an impact on ecosystem stability. The results obtained can be used to monitor the state of urban forests and assess their recreational sustainability.