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Impact of the invasive species Elaeagnus angustifolia L. on vegetation in Pontic desert steppe zone [Southern Ukraine]

100%

Sudnik-Wojcikowska B., Moysiyenko I., Slim P. A., Moraczewski I. R.

Polish Journal of Ecology

2009

tom 57

nr 2

269-281

The Irano-Turanian species – Russian olive (Elaeagnus angustifolia L.) – is one of most commonly planted tree in the shelterbelts in southern Ukraine. The consequences of introduction of the species from windbreaks, into areas of different land use in west and central Pontic desert steppe zone are evaluated. The above steppe is unique on a European scale and exists only in some parts of the Black and Azovian Sea coasts. In recent years, the socio-economical crisis in Ukraine (less intensively cultivation, as well as limited grazing) has been responsible for the intensification of the spread of alien tree species outside the windbreaks. Studies were conducted in Kherson Region, in the immediate vicinity of the Black Sea Biosphere Reserve, where the presence of aliens is undesirable. The analysis of phytosociological material (48 relevés with and without Russian olive) collected from areas of different land use type and limited human pressure (as abandoned field, former intensively grazed solonetz and extensively grazed desert steppe vegetation) show that E. angustifolia can impede the regeneration of the desert steppe. The species creates favourable conditions for the growth of geographically and ecologically alien nithrophilous weeds.

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The floristic differentiation of microhabitats within kurgans in the desert steppe zone of Southern Ukraine

100%

Sudnik-Wojcikowska B., Moysiyenko I. I.

Acta Societatis Botanicorum Poloniae

2008

tom 77

nr 2

Results of the studies on the floristic biodiversity of the kurgans in the Pontic desert steppe of the Black Sea Lowland (Kherson Region) are presented. Twenty-six of about 130 kurgans higher than 3 m, distributed over an area of approx. 1500 km2, were surveyed and the flora of 5 microhabitats within every kurgan (top, southern and northern slope, southern and northern foot) was examined. The richness of the kurgan flora is estimated at 305 species. Species of alien origin constituted 23% of the total flora, which indicates limited anthropogenic influence. Species of two classes, Festuco-Brometea and Stellarietea mediae were predominant, which also confirmed the semi-natural character of the kurgan flora. The lowest number of species was recorded on top, which was relatively rich in synanthropes, particularly therophytes (Stellarietea mediae). The north side was richer in species than the south side of the kurgans. Steppe species were the most stable and important component of the flora of the slopes (45-47% of the species represented the class Festuco-Brometea). The total flora of the foot contained more species and was more diversified than the flora of the slopes (although the mean number of species was similar in both habitats), but each species occurred at low frequency. There was a higher proportion of species which were introduced from the area surrounding the kurgans, e.g. weeds, halophytes, meadow species, as well as trees which are rarely found in the desert steppe zone. In spite of the small size of the kurgans, significant differences between the floristic composition of the various microhabitats were detected.

Ograniczanie wyników

1 Acta Societatis Botanicorum Poloniae

1 Polish Journal of Ecology

2 Sudnik-Wojcikowska B.

1 Moraczewski I. R.

1 Moysiyenko I.

1 Moysiyenko I. I.

1 Slim P. A.

1 2009

1 2008

Wyniki wyszukiwania

Impact of the invasive species Elaeagnus angustifolia L. on vegetation in Pontic desert steppe zone [Southern Ukraine]

The floristic differentiation of microhabitats within kurgans in the desert steppe zone of Southern Ukraine