Changes in sediment and sediment interstitial water characteristics in Lake Fertő/Neusiedler See
ÁGOSTON-SZABÓ, E. | DINKA, M.
Changes in the C, S, N, P concentrations, organic matter content and electron transport system activity (ETS) of the sediment and in the NO2-, NO3-, PO43- SO42-, NH4+ concentrations of water and sediment interstitial water were studied in the Hungarian part of Lake Fertõ/Neusiedler See during the vegetation period. Sediment samples were collected in healthy and die-back reed stands and in the open water area from the 0-5 cm sediment layers. Organic matter content, C, N, S, P concentrations and ETS-activity were significantly higher in the sediment of the degraded reed stand. Higher electrical conductivity and SO42- concentration were found in the second part of the vegetation period, when the water level was lower. The seasonal variation in PO43- and NO3- concentrations of the surface water showed an antagonistic pattern. Higher PO43-and NH4+ concentrations were measured in the sediment interstitial water in summer, when the temperature and the decrease in SO42- concentration, which indicate the SO42- reduction processes, were greater. The higher ETS-activity values in September were probably due to the decaying mass of macrophytes.
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