The Influence of Hydrothermal Moistening on the Radial Growth of Larch in Central Yakutia

Dendrochronological assessments were conducted on larch samples across three sites within the Tabaga region (central part of Yakutia, Russia), which resulted in the creation of a tree-ring width database. The plots are characterized as larch-birch lingonberry-forb forest type. More than 20 samples were collected from each plot: 73 cores. The methodology involved the selection of “reference years,” i.e., years in which the majority of trees demonstrated the narrowest or widest growth rings. A correlation between the width of larch tree rings and the Selyaninov hydrothermal coefficient was identified. Analysis of the comprehensive statistical data set from site T3 established a relationship between the hydrothermal conditions in Central Yakutia during August and the radial growth of larch trees over the period of 1920–2018. It is hypothesized that there is a latitudinal dependency of radial growth on hydrothermal conditions among larch trees in the Northern Hemisphere in light of climate change and other geophysical factors.