coenopopulation, Platanthera bifolia;, ontogenetic structure, National Nature Park «Tsumanska Pushcha».
Abstract
The article presents the results of the study of the ecological-coenotic features and the structure of the cenopulations of Platanthera bifolia (L.) Rich. on the territory of the Kivertsi National Nature Park «Tsumanska Pushcha» – a species listed in the Red Book of Ukraine in the status of «unassessed». The floristic composition of phytocenoses with the participation of P. bifolia in the national park includes: 23 species in trial area No. 1, 17 plant species in trial area No. 2; In park conditions, P. bifolia is characterized by an incomplete type of ontogenesis: two periods (pregenerative and generative) and 5 age states (juvenile, immature, virginile, generative flowering plants, generative temporarily non-flowering plants) are described. It was established that cenopopulations are immature, of a normal type, characterized by bimodal, left-sided age spectra with a maximum in individuals of the pregenerative period. The research was conducted during the growing season of 2021–2023. P. bifolia (L.) was studied on the territory of the Kivertsi National Nature Park «Tsumanska Pushcha» "Tsumanska Pushcha" of the Berestyan Forestry, quarter 25, section 54 and on the territory of Partizan Forestry, quarter 26. section 3, trial area. During the research period, no seedlings of P. bifolia were found, although there are juvenile individuals, and there are no senile individuals. 121 individuals grow on trial area No. 1 under conditions of fresh subors, the density is 0.12 m2, on trial area No. 2 under conditions of wet sugruds, 159 individuals with a density of 0.16 m2 are described. According to the determined age index, both populations are young. Thus, populations of P. bifolia in the conditions of the Kivertsi National Nature Park «Tsumanska Pushcha» have favorable conditions for growth and development. There are large number of pregenerative individuals indicates good conditions for seed renewal. The presence of a significant number of individuals in the pregenerative state indicates satisfactory seed regeneration.
Author Biographies
O. S. Muzychenko, Lesya Ukrainka Volyn National University, Lutsk
Candidate of Biological Sciences (Ph.D.), Associate Professor
M. V. Boiaryn, Lesya Ukrainka Volyn National University, Lutsk
Candidate of Geographіcal Scienses (Ph.D.), Associate Professor
Z. M. Budnik, National University of Water and Environmental Engineering, Rivne
Candidate of Agricultural Sciences (Ph.D.), Associate Professor
