Pulatsu Serap, Topcu Akasya
Ankara University, Faculty of Agriculture, Department of Aquaculture and Fisheries, 06110 Ankara, Turkey.
J Environ Biol. 2009 Sep;30(5 Suppl):801-6.
In this study variations in total dissolved phosphorus (TDP), soluble reactive phosphorus (SRP) and total iron (TFe) concentrations and pH values in the littoral sediment porewater of macrophyte-dominated eutrophic Mogan Lake (Turkey), were determined depth wise (0-20 cm, on a basis of 5 cm depths) over a period of eleven months. Additionally water temperature, dissolved oxygen, redox potential, TDP, SRP and TFe levels in the overlying water were measured. Especially in the spring and summer months constituting a large portion of the research period, seasonal variation of SRP at depths between 0-5 cm and 15-20 cm were not found to be statistically significant (p > 0.01). However in the fall and winter months, surface sediment (0-5 cm) SRP values were elevated in comparison with deeper sediment depths. As for TFe values, no clearseasonal variation was evident at different depths. Due to the fact that TFe concentrations in the overlying water (101.25-511.67 mg x m(-3)) were lower than iron concentrations in the porewater (104.00-783.00 mg x m(-3)), positive phosphorus release remained at low levels. In this eutrophic lake, in which action is continuing to reduce the external phosphorus load, monitoring SRP variations in the overlying water and porewater would be beneficial.
在本研究中，对以大型植物为主的富营养化土耳其莫甘湖沿岸沉积物孔隙水中的总溶解磷（TDP）、可溶性活性磷（SRP）和总铁（TFe）浓度以及pH值的变化，在11个月的时间里按深度（0 - 20厘米，以5厘米深度为基准）进行了测定。此外，还测量了上覆水中的水温、溶解氧、氧化还原电位、TDP、SRP和TFe水平。特别是在构成研究期大部分时间的春季和夏季月份，0 - 5厘米和15 - 20厘米深度之间的SRP季节变化未发现具有统计学意义（p > 0.01）。然而在秋季和冬季月份，表层沉积物（0 - 5厘米）的SRP值相较于较深沉积物深度有所升高。至于TFe值，不同深度未发现明显的季节变化。由于上覆水中的TFe浓度（101.25 - 511.67毫克×米⁻³）低于孔隙水中的铁浓度（104.00 - 783.00毫克×米⁻³）, 磷的正向释放仍处于较低水平。在这个正在持续采取行动减少外部磷负荷的富营养化湖泊中，监测上覆水和孔隙水中的SRP变化将是有益的。
