Home – Home – Jornals – Flora and Vegetation of Asian Russia 2025 number 3

In a stable climate, the seasonal development of autochthonous plants is well synchronized with the local climate, which determines the stability of their fruiting. However, after the onset of global warming, the periodicity of crop formation began to change in many species, so there was a need to study the causes of this phenomenon. Using the example of Pinus sibirica Du Tour, an economically important nut-bearing species with uneven seed production over the years, the influence of short-term weather anomalies at the stage of cone formation and late spring frosts in the year of development of annual cones is considered. The research was carried out on the example of 180-200-year-old pine trees near the village in the south of Western Siberia. The harvest of mature cones was taken into account for the period 1990-2023. The number of cones laid was determined retrospectively by traces of fallen organs on the bark of shoots. At the same time, meteorological data for the same period obtained from the nearest weather station were analysed. It was found that the optimal conditions for cone setting are average daily temperatures no higher than +17.5 °C in the first ten days of August. The number of cones a depended on the spring weather in the year of growth and differentiation of annual cones and negatively correlated with the sum of active temperatures above +5 °C accumulated before the late spring frost. It has been suggested that the climatically determined continued increase in heat supply in the spring against the background of delayed frosts is fraught with an increase in the negative trend in the dynamics of seed production.