The response of radial growth of scots pine to climate change in the planting of the Arboretum of the Biotechnological University in Kharkiv
Abstract
Purpose. of the study is to identify the features of the response of the radial growth of Scots pine to climate change in a stand growing in the Arboretum of the Biotechnology University in Kharkiv.
Methods. Silvicultural, dendrochronological, statistical and correlation analysis methods were applied.
Results. 11 cores were selected from tree trunks with a Pressler borer. Layers of late, early and tree ring widths were measured using the HENSON device. An index local tree-ring chronology was created. The biological (age) trend was removed using the 3-year sliding method. A correlation analysis was conducted between index tree-ring chronologies and climatic factors (precipitation and temperatures from June of the previous year to August of the current year).Against the background of increasing temperatures, three periods of pine stand development were distinguished by indicators of late, early and annual wood. Late wood turned out to be the most variable compared to annual and early wood. It was established that there was a weakening of pine plantations during the third period. This is evidenced by the largest number of significant correlations between radial growth of pine and climatic factors for 2009-2022. In 1978-1993, the temperatures of the previous year’s growing season (June-August) limited the growth of early and annual wood of the current year, and in the following periods 1994-2022 this influence weakened. In 2008-2022 temperatures in March-August limited the radial growth of pine more than in 1979-1993. The lack of stable snow cover associated with warming in winter in the third period probably led to a decrease in moisture accumulation in the soil, so a slight increase in precipitation in winter could not compensate for a sufficient amount of moisture in the soil and therefore precipitation in December of the previous year and January of the current year began to limit the radial growth of Scots pine in the third period.
Conclusions. Dendroclimatic studies of middle-aged pine stands in the forest-steppe zone for three periods: 1979-1993, 1974-2008 and 2009-2022 showed a weakening of the stand during the third period, as evidenced by the largest number of significant correlations between the radial growth of pine and climatic factors. It was found that over five years (2018-2022) there was a stabilization of the radial growth of pine, that is, there was no decrease in the trend of radial growth of trees. This indicates a probable adaptation of pine to climate change at this stage.
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