| Autor: |
I. Ivanyuk, T. Ivanyuk |
| Jazyk: |
English<br />Russian<br />Ukrainian |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
Наукові горизонти, Vol 75, Iss 2, Pp 50-57 (2019) |
| Druh dokumentu: |
article |
| ISSN: |
2663-2144 |
| DOI: |
10.332491/2663-2144-2019-75-2-50-57 |
| Popis: |
The long-term variability of radial growths of ordinary oak trees under conditions of fresh and moist soil is studied on the basis of subsidiaries of Zhytomyr regional utility agricultural forest enterprise "Zhytomyroblagrolis". To understand the nature of the forest and to solve some practical problems the indicator of radial growth is used. The study of the radial growth of individual trees and tree stands is carried out by the dendrochronological method. The researches were carried out in 77-year-old oak stands. For dendrochronological analysis on 10 temporary trial areas 15 samples (cores) of wood were selected at the height of trunks at 1,3 m by Pressler increment borer. The total number of calculated cores was 150 pcs. The values of annual rings were measured with the Corim Maxi tool with an accuracy of 0.01 mm. The basic statistical characteristics of tree-ring chronologies were calculated: coefficient of variation, coefficient of sensitivity. The average values of current radial growths are defined: in fresh soil conditions the value of this indicator is 2.04 + 0.05 mm, and in the wet ones - 2.20 + 0.10 mm. It was revealed that oak tree stands are in depressed state. It has been established that in the structural stability of the oak tree stands of fresh soil conditions cyclicity which lasts in average for 22 years can be traced, and such cyclicity in the oak tree stands of moist soil conditions is absent. During the growth and development of oak tree stands there is a loss and restoration of physiological stability under the influence of environmental factors. Physiologically the oak tree stands growing in the wet soil conditions are more stable. Indexes of radial growths of oak tree stands are equally responsive to abiotic factors, but the tree stands in fresh soil conditions have responded to changes of environment more than the oak tree stands in the wet soil conditions. It was stated that under the new conditions of localization the growth of oak stands up to the age of 70 years decreases, while under the moist conditions it increases. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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