Комплексна оцінка зимостійкості та потенційної морозостійкості деревних ліан родини Vitaceae juss. в умовах інтродукції в правобережному лісостепу України

Abstract

The purpose of the study was to investigate the winter and frost resistance of introduced woody vines of the Vitaceae family of the genus Ampelopsis Michx. and Parthenocissus Planch. in the conditions of introduction in the city of Kyiv, located in the Right-bank Forest Steppe of Ukraine. The actual winter resistance in the field was determined by establishing the degree of freezing of shoots after the winter, which was calculated by the percentage of the damaged part of its total length. The dependence of the degree of winter resistance on phenological features of seasonal development was defined as the ratio of the duration of vegetation to the duration of shoot growth. Potential frost resistance was determined by setting the biological limit of frost resistance of individual tissues of the medial part of annual shoots by determining the level of their damage as a result of direct freezing at a given temperature. According to the results of the research, we provided comprehensive estimation of winter and frost resistance of the investigated representatives. Research has shown that woody vines of the genus Parthenocissus are characterized by a sufficient level of winter hardiness and potential frost resistance, and members of the genus Ampelopsis – medium and low. Thus, in modern climate change, introduced woody vines of the genus Parthenocissus manifest themselves as plants with a higher degree of winter- and potential frost-resistance than the representatives of the genus Ampelopsis, because after the winter their shoots freeze less, and the tissues of shoots and buds are less exposed to the harmful effects of lowering the temperature. This indicates a high correspondence of the phenorhythmics of their seasonal development to the climatic conditions of the Right-Bank Forest-Steppe of Ukraine, timely entry into the dormant period.