SEASONAL DYNAMICS OF ULMUS PUMILA L. PHENOPHASES IN THE PROTECTIVE STANDS OF CHERNIHIV (2023–2025)
DOI:
https://doi.org/10.58407/bht.1.26.5Keywords:
Chernihiv, invasive plants, phenology, air temperature, Ulmus pumila L.Abstract
Purpose of the work. To investigate the characteristics of the phenological phase progression of the invasive species Ulmus pumila L. in the urbanized environment of Chernihiv city during 2023–2025, and to determine the sequence and duration of phenological phases and subphases.
Methodology. Phenological observations of U. pumila were conducted during 2023–2025 in accordance with the methodology developed by I. Beideman, aiming to study the seasonal developmental patterns of the species. In the spring period, observations were carried out at 1–2 day intervals, which allowed detailed recording of the onset and course of the main phenological phases. During the summer and autumn periods, observations were conducted twice a week. All data were systematically recorded in a field observation log. In parallel, air temperature parameters were recorded, which made it possible to assess the influence of thermal conditions on the progression of the species’ phenological phases.
Scientific novelty. The results of a three-year phenological monitoring of U. pumila under the conditions of the urbanized environment of Chernihiv city are presented. Interannual dynamics of the timing of the main phenological phases and subphases were determined, and a tendency toward prolongation of the vegetation period was identified. Temperature ranges for the occurrence of key phenophases were substantiated, and the dependence of their onset on mean daily air temperature was confirmed, which refines regional features of the seasonal development of the species under urban microclimatic conditions.
Conclusions. The results of three-year phenological observations indicate that U. pumila in the urban environment of Chernihiv is characterized by an early start of vegetation at low average daily temperatures, a stable rhythm of development and a tendency to an extended vegetation period (239–267 days). The results obtained indicate that the ecologically plastic, invasively dangerous species U. pumila in the system of protective plantings of the city of Chernihiv is able to successfully undergo a full cycle of seasonal development under a wide range of temperature conditions. The identified phenological features may be one of the prerequisites for its stable functioning and further distribution in the region, which justifies the feasibility of further monitoring of the phenological characteristics of the species within the Chernihiv Polesie region, in particular outside urban ecosystems.
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