PHYTODIVERSITY OF PRESENT LANDSCAPES OF UKRAINIAN FOREST-STEPPE ZONE (BY THE EXAMPLE OF APART AREAS OF HAISYN DISTRIC T, VINNYTSIA REGION)

Abstract

Problem Statement and Purpose. Biological diversity is one of the fundamental property of natural complexes, which provides their firmness and shows up on the different levels of their hierarchy. Within the biodiversity researchers mark out phytodiversity which is an account of plant species of the complex.The main purpose of the research is assessment of phytodiversity of relatively natural territorial systems of forest-steppe zone in the conditions of powerful anthropogenic influence. Relatively natural landscapes are the systems which have not been used in human activity for 10 years and more. Present days there are not a lot of such areas because new type of landscapes - agroindustrial complexes - covers large territories. So it is important to know if remaining relatively natural complexes are sustainable. Data iC Methods. The field research of phytodiversity was done in summer 2017. The subjects of research were the areas of steppe and woods on slopes of PivdennyiBug’s and Sob’s valleys (Haisyn district, Vinnytsia region). Standard methods of field describing and assessment of phytodiversity were used.One of basic parameters of phytocenosis firmness is the species composition like an amount of all plants species of phytocenosis in set geographical conditions. The coefficient of germination shows the deviation from the norm of species composition. The index of adventitious species and weed is a value for description of species composition and its transformation under anthropogenic pressure. Also one of the impotent characteristics of species variety is the spectrum of life forms which describes the stability of natural zone.Results. Due to research and calculations it is got that the coefficient of germination was about 55% for steppe areas and only 38% for woods. The index of adventitious species and weed is highly for wooden territories. It means that forests are less steady than steppes.At present days the relatively natural steppe systems (by the example of Haysin district, Vinnytsya region) are characterized with a high germination and monotony regardless of their location. The amount of species is more than 30 for each area. Such complexes might be steady for a long tune. But the wood complexes are unsteady enough and feel the substantial changes in species composition at the increase of the anthropogenic loading. Although their spectrum of life forms corresponds with forest-steppe natural zone.