Analysis of seasonal events changes of Lapland State Nature Reserve coniferous species and their relations to climate factors.

The temperature regime for 29 years (1994–2022) at the weather station of Monchegorsk City is characterized. The average dates of onset of 9 phenological phases in pine (Pinus sylvestris L.) and spruce (Picea obovata Ledeb.)are given; for the period under consideration, significant trends were found only for several phenological phases of spruce. When comparing the dates of the phenophases "beginning of needle unfolding" for spruce and "beginning of flowering" for pine for the period from 2013 to 2022 with the dates of the period from 1964 to 1972, significant shifts towards earlier onset of these phenophases (by 10 and 8 days, respectively) were found. Correlations with mean monthly air temperatures were determined for nine phenophases for pine and spruce, and a high dependence of the onset of a number of phenological phases on temperatures in May for spruce and June for pine was revealed.