General assessment of natural reforestation by the prevailing species, types of forest and types of growing conditions on the territory of the Lisinsky part of the Leningrad Region Training and Experimental Forestry

Abstract

The aim of the study was to study natural reforestation in the middle taiga of the taiga forest zone of the Russian Federation on the basis of mass forest management data, which reflects information about the progress of preliminary reforestation. The task was solved with the help of an electronic database of the research object, which includes the information necessary for the overall assessment of the undergrowth of economically valuable breeds. The assessment of natural reforestation was carried out on the basis of the renewal assessment scale. From the general electronic database of data, all natural-origin selections were selected at the age of the predominant breed of the main tier older than the 4th age class, i.e. coniferous over 80 years old and softleaved over 40 years old. The total sample size was 6,533 allotments with an area of 16,814. 2 hectares. In general, on 32.7% of the area of taxation allotments, there is a complete absence of undergrowth of economically valuable breeds. The structure of the breed composition of the undergrowth is characterized by almost complete dominance of spruce undergrowth. Optimal conditions for the natural reforestation of spruce are created in blueberry forests (99.8% occurrence) and in acid forests-98.4% occurrence. The maximum percentage of undergrowth with a rating of good for the wood species prevailing in the allotment (35% of all allotments with the adolescent) was found in the pine forests of the acidic forest type in fresh sub-forests.