This study investigates the recent dynamics of Cytisus scoparius, a species native to western and central Europe. Its historical range limit extended through central and eastern Poland a century ago. The species had a dwarf-shrub habit, was moderately rare and grew mainly in forest edges due to damage from heavy frosts. Recently, it has been considered invasive in many parts of the world. In Europe, its native range extends to the east, and this process is considered a good indicator of climate change.
The study was located in central Poland, which is in close vicinity to the historical range limit of the species. We conducted the fieldwork in 2022 and 2025, south of and southwest of Warsaw, within 11 sites of C. scoparius formations.
A total of 30 phytosociological relevés were taken. The mean and maximum heights of brooms in the vegetation plots were measured. The data were ordinated with selected vegetation traits as passive variables in order to help understand the vegetation changes between the two surveys.
The studied patches of C. scoparius formations were well-developed and vital. The height of the specimens of C. scoparius has not decreased. The stand initiation, stem exclusion (intermediate), and senescent, successional stages were documented. The terminal stage of the scrub formation was additionally distinguished within two sites. Some of the patches suffered heavy disturbance, which is essential for the reestablishment and thriving of the C. scoparius scrub. In addition, a quick spread into adjacent areas in other areas was also observed. The E67 (S8) expressway probably serves as a local corridor for the species. The study highlights the probability of the present absence of climatic limitations for the species' scrub formation dynamics in the studied area, despite its location close to its historical range limit.
(2025)