The findings of the 10-year permanent research of the Ukrainian Carpathians Norway spruce forests’ decline in the wet mesotrophic Common beech – Silver fir – Norway spruce forest type allowed us to establish the trends of spruce forests’ decline (without forestry actions) in the context of their layers and main indicators. The traditional forestry research methods with elements of IUFRO methodologies have been used within this research. The stages of spruce forests’ decline in the region (initial decline – 5–10 years, progressive – 10–15 years, decline stabilization – without time restriction) have been identified according to the percentage of dead trees volume in the first layer and the duration of decline in spruce forests. The following trends of spruce forests decline have been established during 10 years: 5% per year decreasing of spruce part in the species composition; formation of uneven-age native stands; tree number decrease in the first layer and their increase in lower layers; the volume of dead trees decreases due to snow- and windfalls; a large number of spruce lying deadwood are formed – up to 300 m3 per ha; the number of native species of natural regeneration increases rapidly – up to 10 thousand per ha. These trends should serve as the basis when making decisions on forestry management in the declining spruce forests within this forest type.
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