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Abstract

Basing on the analysis of 440 vegetation plots (relevés) a classification scheme of sand biotopes of Chernihiv Polesie (Northern Ukraine) of levels IV–VI was compiled. Biotopes, protected by the Resolution 4 of the Bern Convention and Annexes II and IV of the Habitat Directive, were identified. The comparative characteristics of biotopes and syntaxa of vegetation according to floristic classification were given. Characteristics of the represented biotopes were described. The biotopes R1Q, R1P, R1M (EUNIS, 2021) appeared to be the most represented for the sands of Northern Ukraine. Fourteen biotopes of Chernihiv Polesie sands, protected by Council Directive 92/43/EEC of 21 May 1992, were revealed.
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Authors and Affiliations

Hanna Danko
1

  1. T.H. Shevchenko National University “Chernihiv Colehium” Hetman Polubotok Str. 53, 14013 Chernihiv, Ukraine
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Abstract

The vegetation of the Chernihiv city sands (natural and technogenic origin) has rather high syntaxonomic diversity (17 associations and 5 initial communities) and the ruderal phytocoenoses prevail. Natural phytocenoses are represented to a small extent (Cyperetum flavescentis Koch 1926, Dichostylidi–Helochloetum alopecuroidis (Timar 1950) Pietsch 1973, Artemisia scoparia–Dianthus borbasii community, Kochietum arenariae Fijalk 1978). Synanthropic psammophytes species communities that are more resistant to anthropogenic influence, are formed under urban conditions. The ecological range of vegetation of sandy alluvia varies from xerophytic phytocoenoses in mineral-poor sand (Kochietum arenariae) to the communities, which indicate waterlogged areas with increased mineralization of water and saline bottom sediments (Typhetum laxmannii Nedulcu 1968). Itispossibletoobserve the adventization and apophization of sand vegetation, one of the indicators of which is the rupture of coenotic connections between the species of the community. These phenomena indicate that the process of synanthropization of the vegetation cover of the city keeps intensifying, and first of all, occurs in places of newly formed technogenic ecotopes.

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Authors and Affiliations

Oleksandr Lukash
Hanna Danko
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Abstract

In Chernihiv Polesie Solidago canadensis most often grows in ruderal communities of the Berteroëtum incanae association. Characteristic plant species of the Artemisietea vulgaris class have been found in many phytocenoses with Solidago canadensis. A typical ruderal community dominated by S. canadensis was found, in which characteristic species of the xero-mesophytic ruderal vegetation of the Onopordion acanthii are well represented. Initial communities with the S. canadensis coverage of 25 to 60% in combination with the species of this order and the characteristic species of other high syntaxa were found. Most of them are the transformed meadow phytocenoses of the river floodplains and less often – the psammophytic phytocenoses of pine terraces. The process of ruderalization of meadow ecosystems as a result of the invasion of S. canadensis in Chernihiv Polesie was revealed. This process is especially pronounced on the loess islands, where meadows change into semiruderal grasslands and herblands of the Convolvulo arvensis– Agropyrion repentis alliance. S. canadensis invasion leads to xerophytization and unification of the floodplains meadow phytocenoses grassland. The course of these processes is accelerated by anthropogenic pressure on ecosystems and has irreversible consequences. S. canadensis rarely occurs in the Koelerio–Corynephoretea canescentis class psammophytic communities
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Authors and Affiliations

Hanna Danko
1
Oleksandr Lukash
1
Iryna Morozova
1
Volodymyr Boiko
1
Oleksandr Yakovenko
1

  1. T.H. Shevchenko National University “Chernihiv Colehium” Hetman Polubotok Str. 53, 14013 Chernihiv, Ukraine

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