State of coenopopulations of Quercus robur L. growing in ravines located in the Dnieper river’s rapids section (recreation zone of the City of Zaporizhzhya), Ukraine

Опис

The research was conducted in three typical ravine forests of the southern variant of the Ukrainian Steppe. The age and vitality structure were studied, demographic characteristics of Quercus robur L. coenopopulations in 1999 and 2019 were calculated and changes that occurred over a 20-year period were analyzed. These forests are subject to a high anthropogenic pressure, being a part of the recreational area of residents of the large industrial city of Zaporizhzhya as well as tourists visiting the island of Khortytsia. There is a gradual change of the structure of the ele¬mentary demographic unit of the coenopopulation of Q. robur with an increase in anthropogenic impact starting from spotted and then through diffuse to eventually becoming pointlike. Coenop¬opulations of this edificator species sampled from the ravines under study are many-component and have a bimodal real spectrum. During the study period, significant changes occurred in the left, pregenerative parts of the spectrum and are associated with the changes in the quantitative ratios of juvenile, adult and virginile individuals. As a result of recreational exposure, the range of variants of ontogenetic development of Q. robur decreases, and the variants themselves include a smaller number of age states. Estimation of the state of Q. robur coenopopulations using eight demographic indices showed some decrease in the regenerative potential and increase in the share of generative and postgenerative individuals in the coenopopulations of Heneralka and Khortyts’ka gullies. Due to the decrease of the anthropogenic impact, the changes in Shyroka gully are less apparent. All coenopopulations of Q. robur are young and have significant adaptive potential. Therefore, they are capable of sustainable generational turnover even in case of low amount of specimens.
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