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Changes of the Nutrients and Water Trophic States in Upo Wetland  

Lee, Jung-Joon (Division of Science Education, Daegu University)
Lee, Jung-Ho (Division of Science Education, Daegu University)
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Abstract
In the four swamps of Jjokjibeol, Mokpo, Upo and Sajipo in the Upo wetland, the nitrogen nutrients, phosphorus nutrients and chl-$\alpha$ had been observed during the period from April 2005 to December 2009 on monthly basis. Based on the results, the fluctuations of trophic state in the Upo wetland were estimated. Measurements of the nitrogen nutrients such as $NO_3$-N, $NH_3$-N and T-N showed to be generally decreased in comparison with those in the precent studies. Yet the T-N was still considerably higher than the general concentration level of eutrophication and algal blooming. $PO_4$-P and T-P showed to have reduced considerably in comparison to precedent studies. However, T-P also turned out to be dissolved over the nutrient standard. Nitrogen nutrients and phosphorus nutrients were the lowest in Jjokjibeol in the Upo wetland. The chl-$\alpha$ concentrations were the highest at summer periods in Jjokjibeol and Mokpo. However, the highest at non-summer periods in Upo and Sajipo. Among the four swamps, Upo had the highest density on average of chl-$\alpha$, and Mokpo the lowest. Through TRIX (Trophic Index) analysis evaluating trophic state of the Upo wetland, all four swamps were estimated of poor water quality (eutrophication).
Keywords
Upo wetland; trophic state; TRIX; poor water quality; eutrophication;
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