Phenomenon of Tree Stem Rotation During Growth Process of Woody Plants (Вased on the Example of Pinus sylvestris L. and Picea obovata Ldb.)
S. A. SHAVNIN, I. S. OVCHINNIKOV, D. Yu. GOLIKOV, A. A. MONTILE, V. A. GALAKO, V. E. VLASENKO
Botanical Garden, Ural Branch of RAS, 620144, Yekaterinburg, 8 Marta str., 202а
Keywords: Pinus sylvestris, Picea obovata, радиальный рост, морфогенез древесных растений, косослой, вращение ствола дерева, radial growth, woody plant morphogenesis, timber spiral grain, rotation of the tree stem
Abstract
As a result of direct measurements, the phenomenon of tree stem rotation of Pinus sylvestris L. and Picea obovata Ldb. during the vegetation period has been established and described. On five trial plots located in different forest-growing conditions, the occurrence of the phenomenon, the magnitude and direction of turns, and their dynamics were studied over two years. Average values of rotation angle are 0.2-0.5, the maximal ones are 1.3-1.7. These characteristics are dependent on weather conditions of the year and forest types. On the following year more than half of trees change the direction of rotation to the opposite one, and 8-19 % of pine trees keep it. Based on the analysis of published and obtained data, a qualitative model of morphogenetic processes which explains the mechanism of the phenomenon described is proposed.
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