V. Vateva, K. Stoeva, D. Pavlov
Abstract. Natural meadows and pastures are some of the most valuable ecosystems, which oversee a wide variety of plant species. Exploration of the biodiversity of the pasture swards and meadows in the region is mainly to familiarize and with a view to their protection and conservation. Evaluation of the botanical composition of meadows and pasture swards is important for establishing the dominated groups, their variability and relation to productivity and biomass quality. The aim of present study is to analyse the changes in the botanical composition of the main grassland types in areas of Sakar and Strandja, to make comparative environmental assessment of changes occurring in the botanical composition of pasture swards in the two similar regions. The observations demonstrate that the main types of grassland swards in Sakar and Strandja are cereal-forbs. In the area of Strandja they occupy a greater proportion compared to the pastures of Sakar. In Sakar participation of leguminous species is greater than that of the Strandja mountain. From cereal species the most dominant are the species from the genera Festuca, Bromus, Andropogon, Agrostis, Cynodon Lolium. In the leguminous species dominate representatives of Trifolium and Lotus. In the group of forbs the greatest is the participation of the genera Achillea, Hypericum, Plantago, Centaurea, Convolvulus.