UDC

581.92

Authors

The study of the current diversity of the dominant vegetation type – spruce forests of the middle taiga subzone of Arkhangelsk region has been carried out since 2004 by the example of the Plesetsk District, the poorly studied region in the Western part of the subzone. The study area is characterized by a combination of silicate parent rocks with carbonate; spruce forests are formed on the rocks of both types. The differences in environmental regimes of habitats dedicated to polytypic species contribute to the floristic and syntaxon diversity of spruce forests. The eco-coenotic study of spruce forests is conducted. The ecologo-phytocenotic classification of spruce forests is performed. According to the results of the classification 4 groups of associations in the spruce forests of the Plesetsk District, Arkhangelsk region are allocated (greenmoss spruce forests, polytric spruce forests, sphagnum and grass forests) and 11 associations with 7 subassociations and 7 versions. These groups of associations account 60, 7, 20 and 13 % of the area of spruce forests, respectively. The floristic list is formed; habitats of some speciesare refined; rare and requiring protection species and communities are identified. We marked about 170 species of vascular plants (representing 17% of the regional native flora) of 115 genera and 49 families in the spruce forests coenoflora. The proportion of the families Ericaceae and Rubiaceae is a bit higher in the spectrum of leading families of the spruce forests coenoflora compared to the regional flora, while the proportion of Caryophyllaceae decreases. 4 species of vascular plants listed in the Red Data Book of Arkhangelsk region are identified in the composition of coenoflora.

Abstract

Keywords

coenoflora, ecologo-phytocenotic classification, spruce forests of the Plesetsk District, rare and protected species

References

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