APPROACH ON THE EVOLUTION OF GRASSLANDS FLORISTIC COMPOSITION AFTER FLOODING PUBLISHEDAlexandru Moisuc, Veronica Sărăţeanu, Carmen Durău, Valeria Pavel
The purpose of this research is to highlight the evolution of grassland vegetation after flooding, because the scientific data in this topic are limited for western Romania. The studied material consists in six grassland that were flooded in the spring of 2005, respectively 3 surfaces from Grăniceri and other 3 from Foieni, both localities belonging to Timiş County. The data were registered during 2005 – 2007. The study method used for vegetation analysis was quadrate point method. The results obtained on grassland Grăniceri 1 the dominant species are mainly annual grasses as Hordeum histrix and Bromus hordeaceus, and in the next years they were replaced with perennial grasses with high forager value as Lolium perenne and Dactylis glomerata. The persistence of humidity excess favours the maintenance adapted for humidity excess as are rushes and sedges. In the case of Grăniceri no.2 the situation regarding the dominant grasses is similar with the one found in grassland Grăniceri nr. 1, but there an important contribution has Xanthium strumarium, and in the next years Lolium perenne became dominant. Here are present few legumes species and rushes and sedges are absent due to the shorter duration of water stagnation. Grassland Grăniceri no.3 presents the same situation of grasses, but there are present halophyte species as Limonium gmelini. Here are present legumes too, and starting with 2007 there aren’t present rushes and sedges. On those three grassland studied in Foieni grasses had an increase trend from the point of view of their contribution in vegetation cover. Species from other botanical families have a lower participation. The dominant grasses found there are Cynodon dactylon and Echinochloa crus-galli. There are present rushes and sedges too and legumes are missing in general or participate in the vegetation covers with 0.2% and 0.8%. These grasslands are overexploited because they are placed near to the inhabited area of the village.
grassland; floristic composition; flooding