Direct Observation of the Developing Intra-Annual Density Fluctuation (IADF) for Scots Pine in Semiarid Siberian Belt Forest: External Stress Targets Cambium
Kholdaenko Y.A. Karmanovskaya N.V. Belokopytova L.V. Zhirnova D.F. Mapitov N.B. Vaganov E.A. Babushkina E.A.
February 2026Multidisciplinary Digital Publishing Institute (MDPI)
Plants
2026#15Issue 3
Long-term observations of the seasonal growth of Scots pine (Pinus sylvestris L.) tree rings in the arid conditions of the Khakass-Minusinsk Basin (southern Siberia) revealed that in 2024, trees had formed a tree ring with a typical intra-annual density fluctuation (IADF) in the transition wood. An analysis of the timing and causes of this wood structure anomaly was conducted using a combination of three approaches: (1) analyzing images of cross-sections of the forming tree ring throughout the season; (2) comparing the timing of anomalous cells’ differentiation with daily climate data; (3) comparing seasonal growth observations with calculated characteristics of the modeled growth rate and its derivatives: soil moisture and transpiration. We found that during the most severe heat wave and drought (from 22 June to 9 July), the last normal earlywood cells were yet expanding, IADF cells were being produced in the cambial zone, and the first of them began expansion, while normal cells began being produced again immediately after the subsiding of environmental stress. Apparently, low soil moisture and very high temperatures mainly impacted cells in the cambial zone, marking it as the primary target of external factors influencing tree-ring formation and structure, which is important for dendroclimatology and digital wood anatomy. This result is supported by both indirect and limited direct evidence from other sources.
false ring , mechanistic VS-model of tree growth , phenology of xylogenesis , Pinus sylvestrisL , Southern Siberia , tracheidograms , tree-ring formation , water stress
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Institute of Ecology and Geography, Siberian Federal University, 79 Svobodny Prospect, Krasnoyarsk, 660041, Russian Federation
Khakass Technical Institute, Siberian Federal University, 27 Schetinkina Street, Abakan, 655017, Russian Federation
Ecological Educational Center “Noosphere”, Fedorovsky Polar State University, 7 50-let-Oktyabrya Street, Norilsk, 663310, Russian Federation
Department of Biology and Ecology, Toraighyrov University, 64 Lomov Street, Pavlodar, 140008, Kazakhstan
Department of Dendroecology, V.N. Sukachev Institute of Forest, Siberian Branch of the Russian Academy of Science, 50/28 Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Institute of Ecology and Geography
Khakass Technical Institute
Ecological Educational Center “Noosphere”
Department of Biology and Ecology
Department of Dendroecology
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Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026