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GÜREVİN C., ERTÜRK A., ALBAY M.
Symposium for European Freshwater Sciences (SEF8), Germany, 1 - 04 July 2013, pp.146
Conference Paper / Full Text
Istanbul University Affiliated:
In this study, nutrient release from sediment of the Küçükçekmece Lagoon, a B class wetland site within the Istanbul Metropolitan area, was measured in monthly intervals in four stations between the October 2006 to February 2008 using the Kajak core.
The data obtained under field conditions showed that the highest values of nitrate (NO3-N) and ortophosphate (o-PO4) were 3.39 mg l-1 and 6.62 mg l-1, respectively. However, the highest value of NO3-N was measured as 3.41 mg l-1, while the highest value of o-PO4 2.95 mg l-1 under laboratory conditions. From these results, the highest values of nitrate and orthophosphate fluxes were calculated as 3035 and 1487 mg m-2 day-1, respectively. Significant differences in the measured nutrient values were found between the deepest and costal stations under field conditions, Laboratory studies was also performed, however the results obtained under laboratory conditions generally did not exhibit such a difference (ρ<0.05). In conclusion, our data indicate that nutrient load of the Küçükçekmece Lagoon is at a level that characterizes highly eutrophic lakes.
The flux measurements were used to estimate the share of internal nutrient loads over the total nutrient loads into the lagoon. The investigations have shown that sediment fluxes cover 45% of the nitrogen loads and 85% of the phosphorus loads into the lagoon on annual basis revealing the importance of sediment fluxes on the progress of eutrophication in the Küçükçekmece Lagoon.