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http://dx.doi.org/10.17663/JWR.2012.14.2.255

Relationships between pH, $NO_3{^-}$ and $PO{_4}^{3-}$ and phytoplankton distribution in the upper stream of Dorim-cheon  

Kim, Jae Geun (서울대학교 생물교육과)
Kim, Taehyeon (서울대학교 생물교육과)
Yoo, Jimin (서울대학교 생물교육과)
Lee, Juyeon (서울대학교 생물교육과)
Publication Information
Journal of Wetlands Research / v.14, no.2, 2012 , pp. 255-263 More about this Journal
Abstract
The stream has various environments and they are serving as main habitats of aquatic organisms. The distribution of phytoplankton is affected by water environment, especially pH, nitrogen and phosphorus. To reveal the relationship between phytoplankton distribution and water environment, we measured pH, $NO_3{^-}$ and $PO{_4}^{3-}$ concentration, and abundance of phytoplankton at 10 sites in the upper stream of Dorim-cheon. pH value ranged 5.05 to 7.56. $NO_3{^-}$ and $PO{_4}^{3-}$ concentrations ranged 0.4 ~ 4.9ppm and 0.02 ~ 0.99ppm, respectively. A point source of $NO_3{^-}$ was Seoul National University but concentration was not high and dropped to normal range at 400m downstream. $NO_3{^-}/PO{_4}^{3-}$ ratio ranged 28 to 152 except site 4 (0.4) where was affected by $PO{_4}^{3-}$ point source. Water pH, $NO_3{^-}$ and $PO{_4}^{3-}$ concentrations increased with downstream and were related to the input of irrigation water from Han-river between site 5 and 6. Bacillariophyceae alge dominated this stream. Phytoplankton density increased abruptly at downstream of site 5. In general, phytoplankton density did not increase until the $NO_3{^-}$ concentration of 3.5ppm and $PO{_4}^{3-}$ concentration of 0.07ppm. Phytoplankton density was low at sites where $NO_3{^-}/PO{_4}^{3-}$ ratio was larger than 50.
Keywords
pH; $NO_3{^-}$; $PO{_4}^{3-}$; $NO_3{^-}/PO{_4}^{3-}$ ratio; phytoplankton density; Dorim-cheon;
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Times Cited By KSCI : 1  (Citation Analysis)
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