Ontogenetic Structure of Coenopopulations of Orchis militaris L. and Dactylorhiza incarnata (L.) Soo (Orchidaceae, Liliopsida) in Romanovsky District, Saratov Region
The results of studies conducted in Romanovsky district of the Saratov region during the period of mass flowering of Orchis militaris L. and Dactylorhiza incarnate (L.) Soo from June 2 till 16, 2017, are presented. Descriptions of habitats of the species (a hollow and a pasture), which differ in the projective cover and dominants, are given. E.g., the dominants in the hollow were Elytrigia repens (L.) Nevski, Carex vulpina L., and Potentilla anserina L, those in the pasture were Elytrigia repens (L.) Nevski, Festuca pratensis Huds., and Festuca valesiaca Gaudin. The ontogenetic structure of populations of these species is shown. E.g., in the hollow, juvenile individuals of O. militaris were absent, immature (23.1%), verginyl (34.0%) and generative individuals (42.9%) were found. In the pasture, juvenile and immature individuals of O. militaris were 6.8 and 9.3%, respectively, and verginyl (36.8%) and generative individuals (47.1%) prevailed. The age spectra of both populations are of right-sided type. In the age spectrum of the D. incarnata coenopopulation, the proportion of age groups of the pregenerative and generative periods was 52.9%. The high recovery and efficiency indices indicate a steady status of the O. militaris and D. incarnata coenopopulationss. To assess the status of these coenopopulations and further forecast of their development, annual monitoring is necessary.
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