Stupinskoye Field Nature Monument: Current Preservation of 60-Year-Old Scots Pine Trees in Different Ecotypes of Geographical Forest Crops

Specially protected natural areas play an important role in the conservation of biological and species diversity. The range of geographical forest crops of scots pine "Stupinskoye field" is a regional natural monument, which contains more than 425 of its ecotypes from different regions of the USSR. The biological age of the trees has reached 60 years. In this regard, the issues of their preservation at the stage of transition of seed progeny from middle-aged to mature ones are of great practical importance. As a result of the conducted comprehensive studies, it was found that by the age of 60, no clear pattern reflecting the current preservation of trees in 32 sample areas (PP) is traced. However, the current preservation of trees in the seed progeny of steppe ecotypes is less (4.78%) than in the progeny of forest-steppe ecotypes (7.05%). These differences are significant with a probability of 0.95. The coefficient of reliability of differences t=3.69 > 1.98. The amplitude of the boundaries of changes in the values of the current preservation of trees in forest-steppe ecotypes is wider (6.7%) than in steppe ecotypes (5.0%).