Complex Analysis of Trifolium Pratense L. populations on the Floodplain Meadows Of the Forest-Steppe Zone of Ukraine

Authors

DOI:

https://doi.org/10.29038/2617-4723-2018-377-5-15

Keywords:

pascual and fenisicial gradients, ontogenetic and vitality structures, thresholds of species resistance, Trifolium pratense, legumes

Abstract

Floodplain meadows, on one hand, are valuable farmland, and on the other hand, are the reserves of meadow biodiversity. To conserve the meadow ecosystems that are under the influence of intensive anthropogenic impact in the form of grazing and mowing, it is important to develop scientifically sound approaches to their normalization. A population approach is promising in solving this problem. Population investigations were carried out at the floodplain meadows of the Forest-Steppe of Ukraine on two farming gradients – on pasture (pascual) and haymaking (fenisicial). The gradient of pascual digression included five stages: PD0, or CA – control area (areas where grazing and haymaking are absent); PD1 – initial stage of grazing; PD2 – stage of moderate grazing; PD3 – stage of strong grazing (half-failure); PD4 – excessive grazing (failure). Fenisicial gradient has 4 degrees: FD0 (CA) – control area; FD1 – initial stage (hay mowing once a year); FD2 – moderate hay mowing (hay mowing twice a year); FD3 – excessive hay mowing (multiple, uncontrolled). The traditional geobotanical and population methods were used during the study. Periodization of the ontogenesis of the studied species was based on literary data and own observations. Integral evaluation of the ontogenetic structure was based on the indexes of I. M. Kovalenko. At the base of the vital analysis           Yu. A. Zlobin's method was used.

Legumes are an important component of meadow grass, enrich the soil with nitrogen, and fodder hay by protein. The article analyzes the ontogenetic and vitality structures of individuals of T. pratense populations (legumes species) as the main elements of complex population analysis, which showed the ways of adaptation and the thresholds of species resistance to grazing and mowing of varying degrees of intensity. Transformation of the ontogenetic spectrum of populations at the last stages of the pascual gradient occurs in the direction of increasing the proportion of individuals of the post-generative period, while reducing the number of pre-generative, as a result of the complication of the seed reproduction process, with considerable compaction of the soil under the influence of excessive grazing. Haymaking has a milder effect, in populations the proportion of young individuals increases as a future population reserve. The vitality structure under the influence of grazing is also changing to a large extent: in populations the proportion of individuals of the lower class of the vitality increases, they become depressed at the last stage (the stage of failure). In general, T. pratense is a fairly stable species under conditions of regulated pasture and haymaking loads. The thresholds of stability of the studyed species populations are the loads characteristic for the stages – CA (PD0, FD0), PD1, PD2, FD1 та FD2.

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Published

2018-06-26

How to Cite

Complex Analysis of Trifolium Pratense L. populations on the Floodplain Meadows Of the Forest-Steppe Zone of Ukraine. (2018). Notes in Current Biology, 4(377), 5-15. https://doi.org/10.29038/2617-4723-2018-377-5-15