Trees spatial location in south taiga birch forests with subordinate spruce crop

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Abstract

The study results of birch and spruce trees’ spatial location in southern taiga wood-sorrel-bilberry (oxalidosum-myrtillosum) birch forests concerning the stages of their development (maturation, maturity, consenescence) and the age generations of subordinate spruce crops are presented. The analysis was carried out on the basis of the survey data within 2,5×2,5 m plots, identified by provisional coordinates by the plans of 11 permanent sample plots. The type of tree placements was characterized by the following indicators: occurrence, average distance between trees, dispersion ratio to the average number of trees, Morisita, Fisher and Odum indices. The birch and spruce trees association, as well as spruce trees of different age generations were assessed. The occurrence rate of birch and spruce trees was determined according to the age development stages of birch forests. It has been established that during the transition from the stage of maturation to the stage of maturity the occurrence rate of the birch decreases from 64 to 18 %, for the spruce it ranges from 70…73 to 53 %. Regarding the type of spruce placement, it was found that from the stage of maturation to the stage of maturity it changes from contagious to accidental. During the consenescence stage, it becomes contagious again, which is connected with the emergence of a new spruce generation. For the trees of undergrowth and 2nd storey of spruce of different ages, the peculiarities of the dynamics of occurrence and type of placement were revealed. The latter changes from contagious to regular. The contagious type of placement is typical for most age groups of the subordinate spruce population. The exception is age groups of spruce trees over 80 years old; their placement is regular or random. It has been established that in order to identify the dominant aggregations of spruce trees and the trees associations of different age groups in the tree stands under survey, an analysis of placement on larger survey sites is necessary.

About the authors

Anatoliy A. Deryugin

Institute of Forest Science RAS

Author for correspondence.
Email: da45@mail.ru

Cand. Sci. (Agriculture), Senior Researcher

Russian Federation, 21, Sovetskaya st., village Uspenskoe, Odintsovo district, 143030, Moscow reg.

Yuriy B. Glazunov

Institute of Forest Science RAS

Email: yu.b.glazunov@mail.ru

Cand. Sci. (Agriculture), Head of the Laboratory of Forestry and Biological productivity

Russian Federation, 21, Sovetskaya st., village Uspenskoe, Odintsovo district, 143030, Moscow reg.

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