ИСТИНА

The natural mechanism of the decay of the spruce stands, as the final stage of the dynamics of spruce phytocenoses in the European part of Russia, is realized by massive windthrows, fires or bark-beetle outbreaks. The main basic laws of biodiversity change are considered depending on the main factors of disturbances after natural and anthropogenic catastrophes. An example of spruce vegetation dynamics after bark-beetle outbreak is considered. Preservation of deadwood and windfall areas of spruce forests leads to a natural course of reforestation, preserving forest phytocenoses, changing only the ratio of dominant species at the stand.