RESEARCH ON QUALITATIVE AND QUANTITATIVE DETERMINATION OF AQUATIC MACROPHYTES EMERGE FROM A FRESH WATER BASIN WITHIN THE RESEARCH STATION OF AQUACULTURE AND AQUATIC ECOLOGY IASI

Valerica Gîlcă, I. Gîlcă, D. Simeanu, Cristina Simeanu, R.M. Radu-Rusu, Doina Leonte, C. Leonte, Elena Ignat

Abstract
    The researches took place between 1 June and 15 July 2017 and consisted in the identification and quantitative and qualitative determination of the aquatic vegetation emerge from a freshwater basin within Research Station of Aquaculture and Aquatic Ecology, Iaşi.
    The emerging aquatic macrophites were diagnosed with the specific determinant of the respective area and vegetation, analyzing the strain, leaves, inflorescence and whole plant. The identified plants were harvested and grouped on associations to be systematically enumerated, then their biomass was determined.
    Quantitative determination of water emerge vegetation was done on a 600 square meter (sqm). That area was divided into plots of 1 sqm, and the plants on each plot were grouped and weighed. The amount of biomass for each taxon per square meter and the entire harvesting area was then determined. With regard to the identification of emerging aquatic vegetation, 29 taxons belonging to 12 families of emerging aquatic macrophytes were determined.
    Total plant biomass on the surface of 600 sqm was 23.120 Kg. Regarding the biomass of the emerging aquatic plants, it was found that the largest spread was Phragmites communis with 8.0 kg / sqm, followed by Typha latifolia with 5.8 kg / sqm., Typha angustifolia 4,5 kg / sqm. and Typha minima with 3.0 Kg / sqm. From the Cyperaceae family, Scirpus lacustris with 4.6 Kg / sqm was determined, and the lowest amount was the species Carex vulpina, which is usually found in the form of clusters on the edge of the fish ponds.

Key words: water, fish pond, vegetation, macrophytes