ALIEN FRACTION OF THE FLORA OF THE DIFFERENT-AGED FALLOWS OF THE NATURE RESERVE MYKHAILIVSKA TSILYNA: STRUCTURE, DYNAMICS AND PROGNOSIS
Abstract
The work is about peculiarities of the structure and dynamics of the alien fraction of the flora on the 1 – 20‑year fallows of the nature reserve Mykhailivska Tsilyna, and a prognosis of its development for the next 10 years. The work is based on materials from the literature and materials collected during a stationary study of the flora of the reserve during 2021 – 2023. A systematic list of alien species of vascular plants on the fallows is provided. The changes in the ratios between their groups in restorative successions were analyzed taking into account the peculiarities of their phytocenosis role. Quantitative predominance of archaeophytes at the initial stages of successions and their gradual decrease at the following stages and an increase in the number of kenophytes have been established. The predominance, by the number of species in the initial stages, of epoecophytes and agrio-epoecophytes – in the following ones was revealed. The peculiarities of the dynamics of the alien fraction have been established: the highest level of its species richness is observed in the first years of the succession; the decrease of it occurs at the stages of establishing the dominant positions of the edificator species (alien or native) and depends on the speed of its spreading; a slight fluctuation in the number of alien species on 10 – 20‑year-old fallows occurs due to the re-invasion of species, that have fallen from the grass stand or less often – new ones. It is predicted, that alien species of wide ecological amplitude (Arrhenatherum elatus (L.) J. Presl & C. Presl, Oenothera biennis L., Cardus acanthoides L., Cynoglossum officinale L., Lactuca serriola L., Lathyrus tuberosus L. etc.) will remain on over 20‑year‑old fallows. Under appropriate conditions, they will be replaced by transforming species (Solidago canadensis L., Acer negundo L., Elaeagnus angustifolia L. etc.) and other aggressive species (Asclepias syriaca L., Fraxinus pennsylvanica Marsh. etc.).
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