The Variability of Radial Increment of Sexual Types of Scotch Pine Under Hydrogenic Conditions

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UDС

UDC 582.475.4:631.524.82:631.524.5

DOI:

10.17238/issn0536-1036.2017.2.85

Abstract

Pinus sylvestris L. manifests the intrapopulation individual genetic variation by the sexual type. The goal of research is the evaluation of variability in radial increment of pine trees of different sexual types under hydrogenic conditions in the northern taiga of the European part of Russia. The research is carried out in the shrub-sphagnum pine forests on wetland upland
soils in the lower reaches of the Northern Dvina. In these conditions pine (Pinus sylvestris L.) of mixed sexual type (about 85 %) is dominated. The proportion of trees with female sexual type is about 15 %, and male trees occur singly (less than 0.5 %). The sexual type of trees is determined by the method proposed by S.A. Mamaev. The mean values of radial increment
are used for the tree-ring analysis of radial growth of different sexual types of Pinus sylvestris L. Trees of different sexual types in 140–150 years of age demonstrate similar parameters in the annual stem diameter growth (0.32 mm – for the female sexual type and 0.37 mm – for the mixed sexual type) and the index of increment (102 % for both sexual types). In the time series the advantage of the absolute value of the pine radial increment of mixed
sexual type is shown, especially in 30–40 years of age. Variability levels of annual growth are high and very high within the individual tree ring chronology and between trees. Sexual types do not differ in sensitivity to external factors (11…13 %). The trees of female type are characterized by the uniform growth and the trees of mixed type – by the intensive growth in the “mature” age. Cyclical fluctuations of the width of pine annual rings of different sexual types are close to the 11-year solar cycle.

Authors

E.A. Pinaevskaya, Postgraduate Student, Research Assistant1 S.N. Tarkhanov, Doctor of Biological Sciences, Senior Research Officer

Affiliation

Federal Center for Integrated Arctic Research of the Russian Academy of Sciences,Naberezhnaya Severnoy Dviny, 23, Arkhangelsk, 163000, Russian Federation;e-mail: aviatorov8@mail.ru, tarkse@yandex.ru

Keywords

Scotch pine, sexual type, radial increment, variability, constant overwetting of soils

For citation

Pinaevskaya E.A., Tarkhanov S.N. The Variability of Radial Increment of Sexual Types of Scotch Pine Under Hydrogenic Conditions. Lesnoy zhurnal [Forestry journal], 2017, no. 2, pp. 85–94. 10.17238/issn0536-1036.2017.2.85

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