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Seasonal Growth and Development of Juniperus communis L. in the Taiga Zone

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I.T. Kishchenko

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UDС

582.475.2:581.522

DOI:

10.17238/issn0536-1036.2017.3.31

Abstract

Study of the most important biological processes (seasonal plant growth and development)
is of great importance in the theory and practice of plant growing. The investigations are carried out in southern Karelia (middle taiga subzone, Botanical Garden of Petrozavodsk
State University) from May to October 1998–2012 to determine the characteristics of growth and development of Juniperus communis L. under the influence of the major climatic
factors. The object of study is plants, growing under the canopy of a pine forest and in the
exposed place. The number of individuals in each group is 25. Regardless of the shade density,
J. communis shoot growth begins at the same time ? on May 26. The peak time of shoot growth of this species is hardly differ ? May 31 ? June 1. However, the maximum shoot growth of plants under the canopy (0.64 mm) is 78 % higher than in the exposed place. The final time of shoot growth in both studied groups coincides ? August 1. The duration of their formation in the shade and in the light is almost the same ? 71...73 days. The effect of air temperature and solar radiation on the intensity of the shoot growth in the exposed place (respectively 68 and 20 %) is significantly higher than in the shade (20 and 7 %). These data, as well as reducing the intensity of plant shoot growth in the exposed place indicate the significant negative impact of increased air temperature and direct solar radiation on J. communis plants. We reveal a significant (3-4 fold) positive influence of air humidity and precipitation on the shoot growth of J. communis under the forest canopy than in the exposed place. The majority of phenophases of J. communis under the full exposure to sunlight begins and ends a few days later than in the shade. The previous studies have demonstrated a high degree of adaptation of plants, “early beginning” and “early finishing” the phenophases. Therefore, this indicator of J. communis plants under the forest canopy is higher than in the exposed place. The optimal conditions for the growth and development of the studied species in the taiga zone are formed only under the forest canopy, in the shade.

Authors

I.T. Kishchenko, Doctor of Biological Sciences, Professor

Affiliation

Petrozavodsk State University, pr. Lenina, 33, Petrozavodsk, 185910, Russian Federation; е-mail: ivanki@karelia.ru

Keywords

Juniperus communis, shoot, growth and development of plants, environmental factors.

For citation

Kishchenko I.T. Seasonal Growth and Development of Juniperus сommunis L. in the Taiga Zone. Lesnoy zhurnal [Forestry journal], 2017, no. 3, pp. 31–39. 10.17238/issn0536-1036.2017.3.31

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Received on December 12, 2016

Seasonal Growth and Development of Juniperus communis L. in the Taiga Zone

 

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