Kontas A, Kucuksezgin F, Altay O, Uluturhan E
Institute of Marine Sciences and Technology, Dokuz Eylul University, Inciralti, 35340 Izmir, Turkey.
Environ Int. 2004 Feb;29(8):1057-62. doi: 10.1016/S0160-4120(03)00098-9.
The distribution of inorganic nutrients and phytoplankton chlorophyll-a was investigated and N/P ratios were determined in Izmir Bay during 1996-2001. The average concentrations showed ranges of 0.01-0.19 and 0.01-10 microM for phosphate-phosphorus; 0.11-1.8 and 0.13-27 microM for (nitrate+nitrite)-nitrogen, 0.30-4.1 and 0.50-39 microM for silicate and 0.02-4.3 and 0.10-26 microg l(-1) for chlorophyll-a in the outer and middle-inner bays, respectively. The results are compared with the values obtained from the relatively unpolluted waters of the Aegean Sea. The N/P ratio is significantly lower than the assimilatory optimal (N/P=15:1) in conformity with Redfield's ratio N/P=16:1. Nitrogen is the limiting element in the Izmir Bay. Phosphate, which originates from detergents, is an important source for eutrophication in the bay, especially in the inner bay. In early 2000, a Wastewater Treatment Plant (WTP) began to treat domestic and industrial wastes. This plant treats the wastes about 60% capacity between 2000 and 2001. The sampling periods cover before and after treatment plant. Although the capacity of wastewater plant is sufficient for removal of nitrogen from the wastes, it is inadequate for removal of phosphate. This is also in accordance with the decreasing N/P ratios observed during 2000-2001 (after WTP) in the middle-inner bays.
1996年至2001年期间，对伊兹密尔湾无机营养物和浮游植物叶绿素a的分布进行了调查，并测定了氮磷比。在外湾和中内湾，磷酸盐磷的平均浓度范围分别为0.01 - 0.19微摩尔/升和0.01 - 10微摩尔/升；（硝酸盐 + 亚硝酸盐） - 氮的平均浓度范围分别为0.11 - 1.8微摩尔/升和0.13 - 27微摩尔/升；硅酸盐的平均浓度范围分别为0.30 - 4.1微摩尔/升和0.50 - 39微摩尔/升；叶绿素a的平均浓度范围分别为0.02 - 4.3微克/升和0.10 - 26微克/升。将结果与从爱琴海相对未受污染的水域获得的值进行了比较。氮磷比明显低于同化最佳值（氮磷比 = 15:1），符合雷德菲尔德比值氮磷比 = 16:1。氮是伊兹密尔湾的限制元素。源自洗涤剂的磷酸盐是该湾富营养化的重要来源，尤其是在内湾。2000年初，一座污水处理厂开始处理生活和工业废物。该厂在2000年至2001年期间处理废物的能力约为60%。采样期涵盖了污水处理厂运行前后。尽管污水处理厂有足够能力去除废物中的氮，但去除磷酸盐的能力不足。这也与2000 - 2001年（污水处理厂运行后）中内湾观察到的氮磷比下降情况相符。
