Features of wood density formation in pine forests (Pinus sylvestris L.) on postagrogenic soils of the Republic of Tatarstan

Currently, a large number of lands previously used in agriculture have been removed from active economic circulation, and the process of restoring native forest vegetation is underway in these areas. These areas of post-agrogenic lands are of interest for studying the patterns of formation of not only the wood stock, but also the density of wood. In the process of the study, a comprehensive assessment of pine stands growing on the former arable lands of the Republic of Tatarstan was carried out. The experiment was conducted in two directions: a series of objects on different types of post-agrogenic soils in four regions of the republic (young stands aged 10–15 years, including forest plantations), and an object on old arable soils (forest plantations aged 55 years) with a contrasting naturally formed stand (85 years in similar soil conditions on forest soils). Trial sites were laid out at the experimental objects, where vegetation was recorded and model pine trees were selected, followed by their felling. Using the obtained sets of wood discs from the models, their basic density was determined sectorially and then the average basic density of the trunk was calculated according to the diameter classes of the stand. Patterns of wood density formation in pine stands on post-agrogenic soils were determined and regression equations were proposed for the relationship of the basic density of wood at an altitude of 1.3 m from the soil level with the average basic density of the entire trunk in the study areas. The regression equations have a sufficient level of the coefficient of determination (R²) and can be used to determine the average density of the trunk wood and subsequently the stem phytomass of pine plantations growing on the post-agrogenic lands of the Republic of Tatarstan.

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