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

ABSTRACT: 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 wa

SUBMITTER: Kholdaenko YA 

PROVIDER: S-EPMC12899285 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature