Palynological investigations of the tundra zone of Kola Peninsula: new methodical approaches.

摘要

From the viewpoint of palynology, the tundra zone of Kola Peninsula, Russia, as compared to its other zones, was poorly studied until recently, and methodical aspects of pollen-spore diagram timing, reconstructions of palaeovegetation and trends ofits development were scarcely developed. Original methodical approaches allowed us to interpret more accurately the results based upon 5 pollen-spore diagrams, 15 radiocarbon datings and 5 sub-recent spectra. In generalized form, the principles of palaeovegetation successions can be presented as the following scheme: 7000-6000 years ago: sparse birch - dwarf shrub - lichen forest-tundra and mountain tundra -> 6000-3800 years ago: sparse birch - dwarf shrub - green moss forest-tundra -> 3800 years ago -up to the present: dwarf birch (dwarf shrub) - green moss and lichen tundra. Thus, it has been shown that even under the climatic optimum taiga coniferous forests did not penetrate into the tundra zone (in its present boundaries).