Formation of Early and Late Pine Wood on Peat Soils

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Abstract

Field data was collected on sample plots in drained pine stands on the soils of upland and transitional bogs in Verkhovazhsky district, Vologda Region. Using dendrochronological methods, we studied the effect of climatic factors (air temperature and precipitation) on the number of cell layers of early- and latewood in the annual dynamics of radial growth as well as on the width of rings in shrub-sphagnum and sedge-sphagnum pine forests. We revealed that in these pine stands, growing on the peat soils of upland and transitional bogs, the number of cell layers of early- and latewood changed synchronously with the width of the annual radial growth of trees. This synchronism is observed both among the trees within each forest type and between the two types of pine forests under consideration. The most distinct connection between the objects under study is seen in the earlywood dynamics. The factors limiting the growth of trees, such as surface accumulation of groundwater and the natural fertility of peat soils, are connected with climatic and orographic conditions. They have a more considerable effect on the annual rings width dynamics, formation of early- and latewood cells in the stands on upland peat soils than those growing on transitional bogs. Climate factors have a similar influence on the radial growth and cellular structure of wood in shrub-sphagnum and sedge-sphagnum pine forests. At the same time, significant effect is produced by precipitation while air temperature is of no importance to the dynamics of the wood anatomical structure. In general, more precipitation leads to a decrease in the increment size and fewer cells, both in case of early- and latewood. The greatest negative effect is produced by the changeability of solid precipitation accumulated during winter.

Authors

1V.S. Vernodubenko, Candidate of Agriculture, Associate Professor 2N.A. Druzhinin, Doctor of Agriculture, Professor 1 Vologda State Dairy Farming Academy by N.V. Vereshchagin, 1 Schmidta, 2, 160555, Molochnoe, Vologda Region, Russia E -mail: quercus45@mail.ru    2 Vologda Regional Laboratory, Northern Research Institute of Forestry, Gorkogo, 83a, 160014 Vologda, Russia, E -mail: drujinin@mail.ru

Affiliation

1Vologda State Dairy Farming Academy by N.V. Vereshchagin,     2Vologda Regional Laboratory, Northern Research Institute of Forestry

Keywords

forest stand, bog type, radial growth, growth rate, temperature, precipitation, tracheid layer, earlywood, latewood.

References

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