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Purpose: to do the analysis of the invasive species of the Chernihiv city flora (Ukraine). Methodology. The invasive species of Chernihiv were selected on the basis of the “List of the alien species that are proposed to be considered as dangerous invasive ones on the territory of Ukraine and included in the “black list””. The analysis of the geographic origin of the invasive species was made on the basis of the arealogical data on the synanthropic species given in domestic and foreign works. 335 geobotanical descriptions were made to determine the ecological and cenotic range of the invasive species in the city of Chernihiv. The syntaxon identification was made on the basis of the ecological and floristic classification. Scientific novelty. 34 invasive species were found in the adventitious fraction of the Chernihiv city flora, their phytocenotic and geographical analysis was made. It is established that the natural conditions of the study area and the factors of anthropogenic impact on the environment first of all contribute to the spread of the kenophytes of the North American origin. It was proved that the active spread of Ambrosia artemisiifolia quarantine weed over the last decade had been causing a particular danger. Conclusions. In Chernihiv, we observe the expansion of the invasive species that came to the region 120-50 years ago (Acer negundo, Amorpha fruticosa, Cyclachaena xanthiifolia, Impatiens parviflora, Xanthium albinum, Echinocystis lobata, etc.), and also the alien species (Ambrosia artemisiifolia, Bidens frondosa, Solidago canadensis, Heracleum mantegazzianum, Reynoutria japonica, Impatiens glandulifera Royle, Helianthus subcanescens). The hydrophilic species such as Bidens frondosa, Echinocystis lobata and Impatiens grandulifera have the largest phytocenotic spectrum in the natural plant communities. The range of the most vulnerable to the invasive plant communities (in order of decreasing their stability) in Chernihiv is the following: moderately moist meadow communities of the Arrhenatherion and Agropyro-Rumicion crispi alliances – the Salicion albae forested and shrubby floodplain communities – the Alnion incanae not swampy forests, the Dicrano-Pinion pine forests – the Epilobion angustifoliae dry outskirts communities. The synanthropic communities affected by the invasive species belong to 17 alliances. Acer negundo, Ambrosia artemisiifolia, Echinocystis lobata, Helianthus subcanescens, Heracleum mantegazzianum, Solidago canadensis, Robinia pseudoacacia, the species of the Amaranthus, Cannabis sativa, Conyza canadensis, Galinsoga parviflora, G. urticifolia, Impatiens parviflora, Phalacroloma annuum, Phalacroloma septentrionale kind have the largest phytocenotic spectrum and frequency of the occurrence in these synanthropic plant communities. Further rooting of kenophytes in the invasive natural plant communities due to the low competitiveness of the native flora species may lead to a loss of the representativeness of the natural florocenocomplexes of the Chernihiv outskirts. |
