Structure of Tree Stands and Peat Deposits of Pine Mesotrophic Bogs in the Western Dvina District of the Tver Region

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Abstract

The studied indigenous pine mesotrophic bogs are located in the Western Dvina district of the Tver region and have mixed atmospheric and groundwater supply with reduced water runoff. A comparative assessment of two mesotrophic biogeocenoses (blueberry-ledum-sphagnum pine forest (PP 1) and blueberry-sphagnum pine forest (PP 2)) is given by the parameters of age series of forest stands, dynamic successional position, regenerative potential, condition of trees and forest stands, volumes of woody debris, degree of infestation by wood-destroying fungi, characteristics of the composition and structure of peat deposit horizons. Mesotrophic forest bogs (Pyavchenko, 1963) belong to the primary biogeocenoses, have a tree layer of different ages, mixed species composition with an overwhelming dominance of Scots pine in numerical and volumetric characteristics. The closeness of the correlation between the volumes of trees and their age in age generations differs: for biogeocenosis PP 1, the correlation based on the linear and exponential approximations is almost absent, for biogeocenosis PP 2, the correlation is very close, almost functional, R2 = 0.93. This situation occurs due to the degree of uniformity of tree volumes distribution in age series. The structure and composition of natural regeneration in both pine mesotrophic bog biogeocenoses suggests the possibility of the mixed spruce-birch formation replacing the pine formation only under significant climatogenic-hydrogenous fluctuations affecting the change in edaphic conditions of growth of bog communities. The study explains differences in the volumes of wood debris by the stages of deadwood decomposition. The transitional peat deposits of both pine forests are similar in structure, but have differences in their thickness: 5.0 m under the blueberry-ledum-sphagnum pine forest and 3.0 m under the blueberry-sphagnum pine forest. While there are undeniable similarities in structure of peat deposits of the pine forests, some differences in ash content, degree of decomposition and density can still be traced, which can be explained by differing geomorphological positions and hydrological regime of both pine forests. For the first time, quantitative and volumetric characteristics of the tree stands and peat deposit horizons structures of native pine mesotrophic bogs are shown in comparative dynamics.

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About the authors

V. G. Storozhenko

Institute of Forest Science of the Russian Academy of Sciences

Author for correspondence.
Email: lesoved@mail.ru
Russian Federation, 21, Sovetskaya St., Uspenskoe, Odintsovsky District, Moscow Oblast, 143030

T. V. Glukhova

Institute of Forest Science of the Russian Academy of Sciences

Email: lesoved@mail.ru
Russian Federation, 21, Sovetskaya St., Uspenskoe, Odintsovsky District, Moscow Oblast, 143030

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2. Fig. 1. Indicators of tree volume and age relationship in age generations of pine mesotrophic bog stands - PP 1 and PP 2.

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3. Fig. 2. Participation of woody species in the total dead wood volume of PP 1 and PP 2.

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