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Contemporary Problems of Ecology

2020 year, number 3

The characters of a biennial shoot system as a unit for modeling the crown development of ulmus glabra huds

I. S. Antonova1, V. A. Bart1,2
1Saint Petersburg State University, St. Petersburg, Russia
2Almazov National Medical Research Centre, St. Petersburg, Russia
Keywords: побег, зональность побега, экспоненциальная модель, многомерный дисперсионный анализ, пространственно-временные единицы строения кроны, двулетняя побеговая система, shoot zonality, exponential model, multivariate analysis of variance, spatio-temporal units of the crown structure, biennial shoot system

Abstract

The article presents the results of a study of the structural organization of the crown of Ulmus glabra . Knowledge of the types of shoot systems that regularly change in the tree crown in ontogenesis of an individual is of theoretical and practical value. In our studies, we used the architectural (modular) approach, which allowed us to describe the spatio-temporal program of tree crown development. The results obtained allowed us to determine that the main structural unit of the crown, resistant to changes in climatic factors, is a biennial shoot system. The choice of this unit is due to the fact that the zonality of the maternal shoot is only detected in the second year of its life. To identify the spatio-temporal structure of a biennial shoot system, the characters of shoots of the first and second years of life are compared. The biennial shoot systems of undergrowth plants of U. glabra were studied in the forest-steppe oak forest of the Belogorye reserve. 100 individuals of the same ontogenetic state were studied. In the studied trees, shoot systems were differentiated into large (“growth”) and small (“main”) by having the same location in the crown. Based on the cross-correlation function, which depends on the number of internodes on the maternal shoot, a regression model of the distribution of side shoot lengths was constructed. It was shown that, when numbering the internodes on the maternal shoot from the top, the dependence of the lengths of the side shoots of the “growth” and “main” biennial shoot system of U. glabra on the number of internodes is consistent with the exponential model. It is established that the development of a biennial shoot system is associated with the conditions of the irradiation and position in crown. Comparison of the two samples allowed introducing the shift parameter into the model, which defines a special zone on the maternal shoot.