Dynamics of forest landscapes of Saint-Petersburg according to the monitoring of the nature protected areas

Since 2006, the monitoring of landscapes on nature protected areas (NPA) of Saint Petersburg has been realized. By 2017, the monitoring network included 55 permanent key plots of size from 100 to 2.500 square meters in 12 NPA, in different types of landscape sites and plant communities. The article presents the main results of the 10-11-year monitoring of landscapes with a predominance of taiga forest vegetation. It is shown that pine (Pinus sylvestris) forests on drained landscape sites on sandy and sandy loam deposits (terraces of different levels, kame hills, long slopes) are in stage of forming mature monodomi-nant stands with a stable annual growth and development of processes of intra-population competition. Processes in the ground vegetation cover of pine forests are caused by after-fire successions or the restoration of herb-dwarf shrub and moss layers after the reduction of recreation load. In the woods on drained locations on a glacial-lacustrine sand and sandy loam and glacial boulder deposits (moraine) with a predominance or a significant rate of spruce (Picea abies) the «expansion» of spruce and replacement of other species (pine, birch, aspen) by spruce are slowed down: reduction of annual growth of spruce stands, increasing the share of damaged trees (including the affected with various diseases), mass fall-outs of spruce trees are observed. In the forests of poor-drained and boggy plains with shallow peat an opposite dynamic trends are revealed: increasing growth of forest stands and decreasing and stabilization of growth with signs of decay of the stands of some species (e. g. black alder Alnus glutinosa) as well. In the forests of almost all landscape sites the participation of broad-leaved trees becomes more visible, especially oak (Quercus robur), which is present in the young growth and somewhere starts to become a part of the forest stands.

nature protected areas, Saint-Petersburg, landscape, monitoring, landscape site, permanent key plot, forest vegetation, landscape dynamics, trends of forest stand change, annual stand growth, recreation load

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