Analysis of Ontogenic Structure of Thymus Serpyllum L. Emend. Mill. and Thymus x Polessicus Klokov (Lamiaceae) Coenopopulations Under the Conditions of the Ympil District, Sumy Region (Ukraine)
DOI:
https://doi.org/10.29038/2617-4723-2019-387-38-44Keywords:
ontogenic structure, cenopopulation, Thymus serpyllum, Thymus polessicusAbstract
The paper contains the characteristics of Thymus serpyllum and Thymus polessicus plants of various ontogenic stages and their percentage in five cenopopulations. Age index by A. A. Uranov and efficiency index by L.V. Zhyvotovskii are calculated, and each cenopopulation is assigned to a certain ontogenic category. On the ground of obtained results, conclusions are made regarding considering the ontogenic structure of Th. serpyllum and Th. polessicus cenopopulations in the conditions of Yampil district of Sumy region. Complex assessment of the ontogenic structure of populations was conducted using a specialized software and conventional methodologies. Showed that the majority of populations are represented by plants of 3–9 ontogenic stages. Most constant are the generative and old individuals present in all investigated cenopopulations. Based on the ratio of the age index and the efficiency index (values of Δ / ω), it was determined that majority cenopopulations was ageing. The value of the age index (by the method of I.M. Kovalenko [12]) is bigger than 1 in all investigated cenopopulations, suggesting the prevalence of degradation processes. According to the classification of T. O. Rabotnov, all investigated populations belong to the category of «normal». All main characteristics of Th. serpyllum and Th. polessicus populations indicate their potential for sustainable existence in the study region. However, their viability appears to be different, with the most evident imitations being faced by the populations under the pine forest canopy (populations are incomplete as to the presence of various ontogenetic states). In contrast the population growth in Elytrigioso (repenae)−thymosum (serpyllae) is community distinguished by the most complete ontogenic structure. As a result of radical changes in natural ecosystems, there is a decrease in the populations of many species, which prompts us to find directions and ways of regulating the mechanisms of development of natural phytocenoses. As a promising scientific direction, the application of the morphometric and vital analyzes of the investigated cenopopulations will allow to evaluate the morphological parameters and survival rates of the individuals of Th. serpyllum and Th. polessicus in the studied area.
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