UDC

581.524.4

Authors

Neverov Nikolay Aleksandrovich
Institute of Ecological Problems of the North, Ural Branch of the Russian Academy of Sciences (Arkhangelsk, Russia)
e-mail: na-neverov@yandex.ru
Belyaev Vladimir Vasilyevich
Institute of Ecological Problems of the North, Ural Branch of the Russian Academy of Sciences (Arkhangelsk, Russia)
e-mail: beljaew29@mail.ru

Abstract

The larch is not widespread species in the forests of the Arkhangelsk region. According to the last census of the Forest Fund (2008), its share in the forested area of the region is only 0,24 %. The larch is found in the majority of forest districts of the Arkhangelsk Region. However, its dispersal throughout the region is far from being even – 80,3 % of the area of recorded plants accounted for Mezen, Arkhangelsk and Leshukonsk forestry. It is well known, that the average inventory indices of the forest stands in the vast areas quite clearly express the zonal differences in their structure and performance, due to climatic conditions of the North because they are the limiting factor and determine the nature of forest vegetation and biomass productivity. However, some recent findings suggest that the spatial organization of highly productive stands in terms of the boreal zone depends on azonal factors, in particular on the lithogenic base, which includes a complex of tectonic, geomorphological and geophysical criteria. In the study of the spatial expansion of the larch, we analyzed the maps of karst outcrop, the maps of larch expansion and the intersection units of tectonic dislocations. As a result, it was found that in some cases, the expansion of the larch coincides with the places of karst rocks outcrop, especially in the northern and north-eastern parts of the region. At the same time, the expansion of the larch (single trees and planting with the larch) especially in the south-east of the region, geographically coinciding with the intersection units of tectonic dislocations, was found in the places, where there is no karst, as in the case with the units in the vicinity of the village Rochegda, where this coincidence is particularly evident. In addition, during the fieldwork on the territory of the Velsk-Ustyansk tectonic unit we observed that as the distance from the center of the unit towards the periphery grows, the larch forest is becoming less, and outside the unit, it almost disappears from the forest stands.

Keywords

expansion of larch, tectonic units, productivity of forest stands, the White Sea-Kuloi plateau, pre-tundra forests

References

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