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) - Adamczyk, Kamila; Jankowska-Błaszczuk, Małgorzata; Przemyski, Alojzy (Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej)
Keywords: species richness; xerothermic grasslands; threatened species; ecological structure; ecotone; Ponidzie region