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The anthropophytisation processes pose a real threat to the phytodiversity on the territory of Ukraine. To study the interpopulation variability and to analyze the factors leading to the excessive increase in quantity of the adventive species individuals in the conditions of anthropogenic transformation, we took as a model the invasion species on the territory of Ukraine: Solidago canadensis L. and Solidago gigantean Ait. According to the study of the morphological signs variability in local populations S. canadensis and S. gigantea in different ecological conditions, we have revealed that the morphometric signs (length of the ramet, number of leaves, length of inflorescences, number of flowers in the inflorescences) of the S. canadensis ramets are characterized by medium and high intrapopulations variability (V = 11.46-68.67 %), and S. gigantea ramets are characterized by insignificant and high levels of intrapopulation variability (V = 7.01-90.04 %), which correlates with unfavourable conditions of anthropogenically transformed habitats. According to the study results, we have discovered that the depressive vitality type, and, correspondingly, the low vitality level is common for the local populations of S. canadensis for ruderal biotopes of anthropogenic herb stands, ruderal biotopes of fallows on sand, highly artificial broadleaved deciduous forestry plantations and fruit and nut tree orchards. Such a vitality type of S. canadensis populations is probably explained by the high level of digression of the above-mentioned biotopes. The local population of the ruderalized thickets of bushes is characterized by the comparatively high value of the vitality index, which is due to the favorable edaphic conditions. On the other hand, the local populations of S. gigantea of ruderal biotopes of anthropogenic herb stands, ruderal biotopes of fallows on sand, highly artificial broadleaved deciduous forestry plantations, fruit and nut tree orchards and ruderalized thickets of bushes are characterized by a prosperous vitality type and, accordingly, a high level of vitality.

Variability of morphological signs of populations Solidago Canadensis L. and Solidago Gigantea Ait. in different ecological conditions