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Direct Observation ofthe DevelopingIntra-Annual DensityFluctuation (IADF)for Scots Pine inSemiarid SiberianBelt Forest: ExternalStress TargetsCambium Kholdaenko Yulia A.Karmanovskaya Natalia V.Belokopytova Liliana V.2026 год

Direct Observation of the Developing Intra-Annual Density Fluctuation (IADF) for Scots Pine in Semiarid Siberian Belt Forest: External Stress Targets Cambium
статья из журнала

База данных: Каталог библиотеки СФУ
Аннотация: <jats:p>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.</jats:p>
Год издания: 2026
Авторы: Kholdaenko Yulia A., Karmanovskaya Natalia V., Belokopytova Liliana V., Zhirnova Dina F., Mapitov Nariman B., Vaganov Eugene A., Babushkina Elena A.
Источник: Plants

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