Abstract
The results are presented for a study of the radial growth dynamics and xylotomic structure along the trunk of healthy and stag-headed Dahurian larch trees (Larix gmelinii (Rupr.) Rupr.) growing in an evenly aged forest stand (64°19′23″ N, 100°13′28″ E) on permafrost on a north-facing slope. The annual ring widths, as well as the tracheid lumens and wall thickness were measured at 1/4, 1/2, and 3/4 of the trunk height and directly near the top for 25 intact and stag-headed trees. It was discovered that the aforementioned parameters demonstrate a negative gradient from root to top that was especially evident in stag-headed trees. The annual rings on the upper part of the trunk has undergone anatomic modifications over the last 20 years: disturbance of the tracheid rows and thinning of the walls of early- and late tracheids. It was found based on the climatic moving response functions of radial growth that the trees on north-facing slope suffer from a water deficit from the end of May until the twenties of June. The presence of both stag-headed and healthy trees on the north-facing slope can be explained by the high variation in the soil’s hydrothermal properties due to the high degree of tessellation of the moss–lichen layer. With time, the sensitivity of certain trees to a water shortage can lead to drying of their tops.




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Funding
The study was carried out with the financial support from the Russian Foundation for Basic Research (17-04-01186, 16-34-00181 mol_a), the Russian Science Foundation (14-14-00295, 18-14-00072), and a Government Grant of the Russian Federation (14.V25.31.0031).
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Translated by P. Kuchina
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Mashukov, D.A., Benkova, A.V., Benkova, V.E. et al. Radial Growth and Anatomic Structure of the Trunk Wood of Healthy and Stag-Headed Larch Trees on Permafrost. Contemp. Probl. Ecol. 14, 767–774 (2021). https://doi.org/10.1134/S1995425521070143
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DOI: https://doi.org/10.1134/S1995425521070143


