| Abstract [eng] |
277 plant species belonging to 71 families and 51 lines were inventoried in the areas of Lake Biržulis. The richest in the plant species are: Asteraceae (28 species), Poaceae (25 species), Fabaceae (17 species), Ranunculaceae (16 species), Apiaceae (12 species), Lamiaceae (10 species). Les than 10 species were found in other families. 5 species that are written into the Red Book of Lithuania were found. 4 habitats of Orchis mascula (category 2) were found in the North East. One example of Malaxis monophylos (category 2) was found at the isthmus in the forest. 7 habitats of Iris sibirica (category 2) were found in the eastern part, not far from Lake Mažasis Biržulis. Betula humilis (category 2) is localized in the eastern part and in the North West. The richest overgrowths are at the strands of Lake Mažasis Biržulis. 3 habitats of Dactylorhiza incarnata (category 4) were identified in the eastern part of the lake. 36 grassland communities were depicted in the areas of Lake Biržulis. These communities belong to 4 classes, 4 lines, 7 unions and 14 aggregations. Iridetum sibirici Philippi 1960, found in areas of Lake Biržulis, is registered into the plant communities of the Red Book of Lithuania. Also 6 forest communities in the examined area were found and described. They are: Carici elongate - Alnetum glutinosae, Betuletum pubescentis, Betulo – Salicetum repentis, Tilio – Qercetum roboris, Ledo – Pinetum, Salicetum pentandro – cinereae. Moreover, 5 Iridetum sibirici Philippi 1960 communities were depicted in the study too. The germination of overgrowth, vitality, abundance of flowering and fruit, sicknesses and pest injuries were evaluated. As study showed the most vital are Iridetum sibirici Philippi 1960 communities No. 1 and No. 5. |
