Influence of the climatic factors on the mass flowering dates of Bulbocodium versicolor (Melanthiaceae) at the south-eastern border of its range

Under conditions of climate change, phenological studies vegetation are particular importance. Most the current research carried out in Protected Areas (PAs), network stations, agricultural lands, nurseries, and botanical gardens. Studies based on remote sensing data do not take into account species diversity cover. This study is aimed to determine regularities timing Bulbocodium versicolor mass flowering at southeast border its range. The studied B. population located vicinity city Volgograd, which makes it available for research. At same time, under constant anthropogenic pressure. Understanding features this (the period highest vulnerability) will allow us organise protection during period. about beginning dates, obtained surveys 2007–2020 with a possible error 2–7 days, as well an archive weather Volgograd station. average start date 24 March ± 12 days. range between earliest latest dates exceeds month. We have found statistically significant correlation snow cover destruction, stable transition maximum air temperature over 0°C, daily temperature, 0°C 3°C. Over 2007–2020, no trends were either or main meteorological phenomena. Almost every year, after flowering, frosts occur soil air, snowfalls place regularly. may be one factors cause lower seed regeneration compared ones northward, since drop contributes depressive state population.