Features of composition, structure and dynamics of spruce forests of Middle Lena valley (Central Yakutia)
https://doi.org/10.31242/2618-9712-2018-26-4-72-79
Abstract
In the article features of the syntaxonomic classification and succession dynamics of spruce forests in a valley of the Middle Lena are considered. Forestry-geobotanical studies and analysis of the successions were carried out in accordance with traditional methods and the latest approaches. There are 4 associations from 2 groups Mixtoherbosa and Hylocomiosa: Piceetum obovatae mixtoherbosum (spruce with various grasses), P.o. mixtoherboso-pyrolosum, P.o. pyroloso-rhytidiosum and P.o. vaccinioso-rhytidiosum. Forests of the Mixtoherbosa group are characterized by high constancy and a significant abundance of xeromezophilic and mesophilic grasses, lack of arctoboreal shrubs, ground mosses and lichens. In the moss cover of Hylocomiosa forests, xeromesophilic Rhytidium rugosum often dominates, which is caused by significant drying of near-surface soil layers in the middle of the growing season. A principal scheme of the successions of the spruce forests is presented, driving factors of dynamics are analyzed. Near settlements, the spruce forests do not reach their potential diversity due to many years of anthropogenic pressure. In specific zonal-intrazonal conditions of the first and second terraces above flood-plain of the valley, the spruce forests can be recognized as the quasi-climax forests. In these landscape parts, the favorable hydrothermal soil conditions and practical absence of fires determine relative stability of spruce forests.
Keywords
spruce forests,
Picea obovata,
syntaxonomic analysis,
successions,
Middle Lena valley,
Cen- tral Yakutia
Supporting agencies: The studies were carried out within the framework of a research project of the Institute for Biological Problems of Cryolithozone (IBPС) SB RAS «Fundamental and applied aspects of study of diversity of plant world of Northern and Central Yakutia» (reg. no. AAAA-А17-117020110056-0).
About the Author
Aytalina Pavlovna Efimova
Institute for Biological Problems of Cryolithozone SB RAS
Russian Federation
Russian Federation
EFIMOVA Aytalina Pavlovna, Candidate of Biological Sciences, Senior Researcher, Institute for Biological Problems of Cryolithozone SB RAS, 41 Lenin Ave., Yakutsk, 677980, Russia, http://orcid.org/0000-0003-3684-3432, aytaef@yandex.ru
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For citations:
Efimova A.P. Features of composition, structure and dynamics of spruce forests of Middle Lena valley (Central Yakutia). Arctic and Subarctic Natural Resources. 2018;23(4):72-79. (In Russ.) https://doi.org/10.31242/2618-9712-2018-26-4-72-79
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