Influence of hydrotechnical melioration on the formation of wood Pinus sylvestris L. in the Vologda region

In drained pine stands in the Sokolsky and Ustyuzhensky municipal districts of the Vologda Oblast, a study was made of the main macrostructural features of Scots pine wood, in particular, the study of the influence of hydrotechnical reclamation on its formation. The objects of study are drained and naturally swamped (control) pine plantations on peat deposits of oligotrophic and eutrophic types of waterlogging. Forest objects were selected in naturally swampy and drained pine forests with different distances between reclamation canals (80, 120 m, etc.), in which temporary trial plots were delimited. Forest taxation work was carried out, an estimate sheet was compiled, and features of the formation of wood in drained pine forests were revealed. The density of wood is determined and characterized by calculation according to the analysis of wood cores. The analysis of the basic parameters of the macrostructure of pine wood, such as the width of the annual ring, the width of the late layer of tracheids, the number of annual layers in one cm, and the growth of wood over 10 years, was carried out. The autocorrelation of pine wood increments, the dynamics of total radial increments of pine wood and extremums for five years of tree growth are calculated and analyzed. Mathematical processing of experimental data was performed using variational, correlation and regression types of statistical analysis. After the study, the positive influence of hydrotechnical engineering on the formation of Scots pine wood in the southern subzone of coniferous boreal forests was confirmed. The density of pine wood in soil with an oligotrophic type of peat deposit under conditions of artificial drainage is higher by 11% (450.8 kg / m3), relative to the situation in naturally swamped forest stands for the same time period. In intensively drained forest stands, the highest percentage of late wood was found, relative to other studied objects – 45%. The average width of the annual tree ring of wood was found to be the largest on peat with a transitional type of waterlogging after selective harvesting of wood near the reclamation canal (1.67 mm). The average value of the obtained auto-correlation of wood increments before reclamation is 0.14, after this indicator increased by 1.6 times.

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