Natural reforestation in forest plantations in the core of the “Kologrivsky forest” national reserve

Natural reforestation is one of the important biological processes. Data on the quantitative and qualitative characteristics of natural regeneration in areas undisturbed by economic activity act as a control option for monitoring succession processes in forest stands affected earlier by felling. The purpose of the study is to study the quantitative and qualitative characteristics of natural regeneration in the stands of the core of the Kologrivsky Forest nature reserve. To study natural regeneration, 11 permanent trial plots were used, laid in the Kologrivsky Forest natural monument in 1981‑1984 and restored in 2014‑2019. According to surveys of trial plots in the core of the Kologrivsky Forest nature reserve, it was revealed that almost all of them are dominated by spruce undergrowth. Also, the layer of the young forest generation is formed by such species as Norway maple (Acer platanoides), small-leaved linden (Tilia cordata), white birch (Betula pubescens) and silver birch (B. pendula), Siberian fir (Abies sibirica), Scots elm (Ulmus glabra). Aspen (Populus tremula) is found in the form of single plants, as unfavorable conditions develop for it under the forest canopy. In old-growth spruce forests, the young generation of the forest has mainly a group distribution and is confined to places where overmature trees fall from the upper canopy. On average, for all trial plots, the share of small undergrowth is 64%, medium – 24% and large – 12%. On all considered trial plots, more than 80% of undergrowth is viable. The main share of doubtful and non-viable undergrowth belongs to spruce.

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