Ecological phytocoenotic characteristics of Platanthera bifolia (L.) Rich. within the territory of Nature Reserve «Bylina» in Kirov Region

Ecological-phytocoenotic confinement of Platanthera bifolia in conditions of middle taiga subzone of Kirov Region was investigated. Studied coenopopulations are restricted mostly to spruce-birch, pine and rarely to spruce phytocoenoses. Herbaceous-shrub cover includes 78 species of vascular plants with dominance of Maianthemum bifolium L., Vaccinium myrtillus L. , Vaccinium vitis-idaea L., Hieracium pilosella L., Equisetum sylvaticum L. , Pyrola rotundifolia L. , Linnaea borealis L. , Trientalis europaea L. , etc . Populations age spectres are in most cases normal and incomplete. Ontogenesis of P. bifolia has pregenerative and generative periods as well as juvenile, immature, virginile and generative age stages. Ecological positions of the species within «Bylina» Nature Reserve are given by Tsyganov scales. It was shown that P. bifolia is a mesobiont species. Maximum potential of P. bifolia is marked on soil acidity scale (11,54%) and illumination scale (11,51%). Estimation of habitat ecological conditions for P. bifolia was accomplished with Ellenberg scales. It was defined that P. bifolia is characterised by significant ecological amplitude. It is a subcontinental, semi-shade species which prefers semi-wet soils with moderate acidity and moderate nutritients richness. According to hemeroby parameters, P. bifolia can be considered a species that survives insignificant and moderate anthropogenic influence in the studied area.