Stands successions course in Solovetsky museum-reserve

The research was carried out on the territory of the Solovetsky Museum Reserve in various most common types of forests — lichen, cranberry, blueberry, sphagnum and blueberry spruce forests. Temporary taxing trial areas were laid out for the research, widely known and proven methods were used. The stand was studied at each test area, in addition, the height diameter was measured and the age of 64 registered trees was determined, sites were laid for the study of undergrowth with its division by species, height and condition. It was found that the highest amount of the pine undergrowth is under the canopy of lichen pine forests, smaller amount in sphagnum and the least is found in blueberry and lingonberry. There is no pine undergrowth in the blueberry spruce forests. Spruce undergrowth is found under the canopy of blueberry cranberry pine forests and blueberry spruce forests. Of the undergrowth of deciduous species, birch undergrowth is mostly found in lichen pine forests, aspen is extremely scarce everywhere, and there is no sphagnum pine forests at all. The composition of the stand has an effect on the composition of the undergrowth. Everywhere pine trees in the undergrowth are several units smaller under the canopy of pine forests, and spruce trees under the canopy of spruce forests. The time of accumulation of undergrowth under the canopy has been established, it is 12–22 years. It has been established that lichen and sphagnum pine forests, as well as blueberry spruce forests, will exist ever so long without human intervention on the areas. In the blueberry and lingonberry pine forests, a change of species is likely to occur and spruce will take the place of pine.