Changes of species richness with special consideration of threatened species within the overgrowing xerothermic grassland in the forest clearing reserve of "Polana Polichno" in the Nida Basin (Małopolska Upland)
2012
Adamczyk, Kalina | Jankowska-Błaszczuk, Małgorzata | Przemyski, Alojzy
The aim of the study was to show the changes of species number and their frequency in different patches of xerothermic grasslands in the period of 2-3 years, as well as relation between the number and frequency of species which were classified in four ecological groups. We wanted to investigate changes in the frequency of several most threatened species: Cephalanthera damasonium, Adonis vernalis, Lathyrus pannonicus, Linum hirsutum, Sesleria uliginosa and Orchis purpurea. The observations were carried out on 120 m² permanent plots situated in the clearing forest reserve "Polana Polichno" in the Ponidzie region. Plots were chosen within the ecotone zone and in the central part of the reserve which represented different management regimes. It was found that within the same patches the mean number of species per 1m² did not differ significantly in the period of 2-3 years. The study showed a distinctly higher density of species in patches of grassland situated in the central part of the clearing in comparison with the ecotone patches, especially in the patch where trees and bushes had been cut down a few years earlier. Moreover, an increase in the number of grassland species and decrease in the number of forest herbs species was noted in the ecotone patch which had been permanently cut.
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