Чагарникова рослинність цілинно-степових біотопів gівденно- та cередньо-cтепової підзон Тилігуло-Бузького межиріччя

Ю. Г. Дмитрук

Анотація


SHRUB VEGETATION OF THE VIRGIN-STEPPE
BIOTOPES IN THE SOUTHERN AND MIDDLE
STEPPE SUBZONE BETWEEN TILLIGUL-BUG

Yu. Dmitruk

 

The agrarian transformation of the Black Sea steppes has transformed them into a mosaic agrarian landscape with frequent of the areas, which in varying degrees still retain the general features of steppe biotopes. The shrubs in them are represented by areas of continuous, or sparse shrub thickets, which grow predominantly in places of specific relief formations, which have an increased level of moisture.

Today, research on shrub vegetation is mostly botanical. System ecological research of modern shruby phytocoenoses, existing in the composition of the mosaic agro-landscape of the region, has not been conducted yet, which makes it impossible for them to have a clear structural, biotic and functional assessment.

The purpose of the work was to study the species composition and typology of shrub vegetation existing in the virgin-steppe plots in the territory of the southern and middle steppe sub-zones between rivers Tiligul-Bug .

Methods. The materials are the results of own research of the existing vegetation of the territory between rivers Tiligul-Bug, carried out in the period of 2013-2017, as well as retrospective (literary and reporting) data on vegetation records of this territory, individual herbarium collections and cartographic materials of different years. Additionally, various factual materials were used - regarding the structure of soils, plowing volumes, climatic and meteorological parameters, species composition of artificial forests and forest belts, etc.

The study area covered the territory of the southern and middle steppe sub-zones within the limits between rivers Tiligul-Bug. The author's studies of the taxonomic composition of natural shrub vegetation have been performed on plots of river valleys, ravines and virgin beams remains that were not subject to plowing. The basic method of field research was the method of multi-seasonal route tracking on the transect, as well as selected the most typical sites (only 14), which were then used for a long time as a models

Results. According to various seasonal and rather long-term (4 years) field surveys of shrub vegetation, 18 species were identified, investigated and identified on the territory of the study. Of these, there are 13 species of shrubs belonging to 10 families in six stationary sections within the middle steppe subzone and in the eight stationary sections of the southern steppe subzone 14 species of 9 families.

The main distribution of species of shrub vegetation by ecological groups is characterized. In the middle steppe subzone, in relation to the conditions of growth dominated by mesophytes, mesotrophs and sithogeliophytes, in the southern steppe subzone, xeromesophytes, mesotrophs and heliophytes predominate.

The obtained research results were subjected to a comparative generalization with data on the species structure of shrub vegetation of the Black Sea steppes, known at the beginning of the 20th century.

The general ecological characteristics of shrub vegetation in biotopically different locations, different from genesis and successional phases

In spite of the deep field transformation of the steppes and the planting of forest bands, in the present conditions of the mosaic agri-landscape between Tiligul-Bug  the core of aboriginal shrubs vegetation clearly retains its original specificity, indicating the evolutionary perfection of their groups.

Discussion. Further research is aimed at specifying the biotopic classification of shrub vegetation in the study area under the current conditions of a mosaic agro-landscape.

Key words: shrubs, North-Western Black Sea coast, agro-landscapes, species composition

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