Nowe stanowisko ostnicy piaskowej Stipa borysthenica i uwagi o jej rozmieszczeniu na Pomorzu Zachodnim

Abstract

Stipa borysthenica is a protected, vulnerable species which appears in a sandy dry grasslands. In Poland it is known from a few stands in the margin zone of the Lower Odra Valley. In 2006 a locality of this species was found in the vinicity of Dolna Odra power station near Gryfino (Western Pomerania, Poland). Stipa borysthenica occurs here in the Spergulo vernalis-Corynephoretum community. The increasing of tufts number from 29 in 2006 to 41 in 2010 indicates good condition of Stipa population. Devastation by people is the biggest threat to population of Stipa borysthenica.