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Vegetation dynamics on fallow agricultural areas in Przemysl foothills [Southeastern Poland]

100%

Barabasz-Krasny B.

Acta Societatis Botanicorum Poloniae

2005

tom 74

nr 2

The studies of fallow lands were undertaken on the Przemyśl hills in the area of Cisowa locality which, till very recently, have been owned by a State Farm (PGR). The objective was to gain insight into the composition and diversification of plant communities on meadows, pastures and fields laid fallow, in context of habitat conditions prevailing after the use had ceased. The study utilised an old cadastral map showing the type of communities by category of use: meadows, pasture, and cultivated fields. The study material consisted of 180 relevés, obtained in the period 1998-2000 using the Braun-Blanquet method. By employing numerical classification, eight plant communities were distinguished, including only two of the association rank: Epilobio-Juncetum effusi, Arrhenatheretum elatioris. The analysis of Ellenberg’s habitat indices proved that all the communities belonged to the half-light vegetation group, occurring mostly on fresh soils, under intermediate moisture-content conditions, more rarely on moist soils which do not dry out. The soil reaction was most often neutral or slightly acidic, and in most of the soils the nitrogen content was in the intermediate range. The two principal trends in the succession of communities in the area, after its farming management has ceased, are: marked increase in species richness resulting from the expansion of species, and the process of overgrowing by woody vegetation.

Ważki [Odonata] Pogórza Przemyskiego i przyległych obszarów wzdłuz Sanu

80%

Daraz B.

Wiadomości Entomologiczne

2009

tom 28

nr 1

5-32

Studies were carried out at 36 localities in Pogórze Przemyskie (the Przemyśl Foothills) and adjacent areas along the San River (SE Poland) in the years 2004-2007. 54 species of dragonflies (74% of the Polish dragonfly fauna) were recorded, among them: a) Nehalennia speciosa in a highly isolated population, currently situated at the southern border of the species distribution, b) Crocothemis erythraea at 5 localities, autochthonous at least at two of them, abundant at one site, and with a probable second generation, c) Cordulegaster bidentata, widespread at many localities, d) Leucorrhinia albifrons and L. caudalis at the southern border of their distribution, the latter species being extremely rare at these latitudes, e) L. pectoralis, rare in southern Poland, f) several thermophilous species as e.g. Aeshna affinis, Orthetrum brunneum, Orthetrum albistylum, Sympetrum meridionale. The species composition of the odonate fauna and the occurrence of some species are commented on and discussed with reference to the geographical position of the area and the habitat spectrum. Conservation aspects are presented and assessed and some conservation measures are proposed.

Ograniczanie wyników

1 Acta Societatis Botanicorum Poloniae

1 Wiadomości Entomologiczne

1 Barabasz-Krasny B.

1 Daraz B.

1 2009

1 2005

Wyniki wyszukiwania

Vegetation dynamics on fallow agricultural areas in Przemysl foothills [Southeastern Poland]

Ważki [Odonata] Pogórza Przemyskiego i przyległych obszarów wzdłuz Sanu