Features of restoration of forest phytocenosis on a post-pyrogenic landscape

Abstract

It is established that the post-fire restoration of the forest ecosystem has its own characteristics. As a result of a grass-roots forest fire, blueberry pine was replaced by blueberry birch. This is primarily due to forest conditions. The object of the study is a 2006 fire in the south of the Republic of Karelia. The species composition, condition and structure of the stand, undergrowth, undergrowth and living ground cover were established using the method of circular accounting sites. 15 years after the fire, a new stand was formed, its density exceeds 22 thousand copies / ha. Due to the high density of the young, the loss of birch reaches 23%. In total, 7 forest-forming breeds were identified in the young stock. Betula pendula Roth. – 73% and Alnus incana (L.) Moench predominate in number – 15%. Despite the large density of the main tier, the undergrowth also participates in the restoration of the forest ecosystem. The total number of plants in this component of the forest is about 17 thousand/ha. More than 95% of the number of undergrowth falls on Salix caprea L. and Sorbus aucuparia L.. In small numbers there are Prunus padus L., Viburnum opulus L and Juniperus communis L. The living ground cover is composed mainly of shade-tolerant species. Polytrichum commune HEDW., Avenella flexuosa (L.) DREJER and Oxalis acetosella L. predominate. Only these 3 species out of more than 26 identified as part of the living ground cover have a projective coverage of about 5%. The total projective coverage of the grass-shrub layer is about 50%. Plots without living ground cover (dead-cover parcels) occupy in general more than 29% of the area of the forest plot. The moss-lichen layer is represented by several types of mosses and lichens. According to the typology of V.N. Sukacheva formed birch can be attributed to the birch forests of the blueberry type of forest.