Zlatan Kovačević

Abstract

Stands of the association of Scirpo-Phragmitetum communis W. Koch 1926 are developing as a secondary emersive vegetation that represents a transition from wetland to terrestrial vegetation. Edificatory type of association, Phragmites communis L. is in competition with Typha latifilia L., and based on the water depth and land characteristics one of those two types dominate by forming sub-associations phragmitetosum Schmalle 1939 and typhaetosum (angustifoliae-latifoliae) Soó 1973. Using Braun-Blanquet methodology on the basis of 10 phytocoenological clips brought to the conclusion of the domination of the phragmitetosum sub-association Schmalle 1939. This sub-association develops in a zone around water pools and the web of canals or makes islands in singular pools or covers entire pool surface during draught. The development of the stands of subassociation of typhaetosum (angustifoliae-latifoliae) Soó 1973 is conditioned with the higher level of water. Stands are floristically empty and the dinamics is hard to notice. Floristic structure of the association contains 34 herbal species: Phragmites communis Trin., Typha latifolia L. and Amorpha fruticosa L. The invasive species, Amorpha fruticosa L. enters the structure of seven stands with relatively small covering value and it either makes peripheral band and canal webs or mixes with Phragmites communis, Salix and Populus. Dominant life form of this association is cryptophyta (47,06%). In the areal spectrum, widely spread flora elements are dominating (82,35%). The values of ecologic indexes point to hydro-helophyta character of stands developing on the neutral or low-acid lands, mineral substances with medium security and adequate light and temperature conditions. The significance of the research can be viewed from both negative and positive aspects of influence on the ecosystem in general.