UDC

574.91

Authors

Leonova Nadezhda Borisovna
Lomonosov Moscow State University (Moscow, Russia)
e-mail: nbleonova2@gmail.com
Goryainova Ingrid Nikolaevna
Lomonosov Moscow State University (Moscow, Russia)
e-mail: letters@biogeo.ru
Mukhin Gennadiy Dmitrievich
Lomonosov Moscow State University (Moscow, Russia)
e-mail: gd_mukhin@rambler.ru

Abstract

The paper describes the structure peculiarities of small areas of forest communities, which are isolated from the main middle taiga in the southern part of the Arkhangelsk region. These forest outliers are widespread in the agricultural landscapes of the center of the Russian Plain and in some developed regions of the Russian North. As the result of our research the place of some isolated forest sites in the Ustyansky district (Arkhangelsk region) in the scheme of ecological and floristic classification, ecological and coenotic structure of the species composition of communities, number of species indicators and Shannon index were established. On the basis of cluster analysis the differences in phytodiversity between the valley and watershed forest outliers and dependence on ecotopic conditions were demonstrated. A comparison of some indicators of community phytodiversity of forest outliers and thick forestlands is represented. The meadow species occurs in forest outliers at almost twice the rate compared to the forest species. A good many of forest ecological-coenotic groups of species indicates the connection with the zonal communities. A large number of nemoral species can be explained by the presence of nemoral and herbal spruce forests in the composition of vegetational cover and the most favorable ecotopic conditions in the studied forest islands. The further study and monitoring of the vegetation are of great interest from the environmental point of view, because of the growing species located on the border of the area, and high biodiversity indexes of the communities.

Keywords

middle taiga, forest outliers, agricultural landscapes of the South of the Arkhangelsk region, structural and coenotic diversity

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