Impacts of dam discharge on river environments and phytoplankton communities in a regulated river system, the lower Han River of South Korea
SCOPUS
KCI
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Title
- Impacts of dam discharge on river environments and phytoplankton communities in a regulated river system, the lower Han River of South Korea
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Author(s)
- Jung, S.W.; Kwon, O.Y.; Yun, S.M.; Joo, H.M.; Kang, J.-H.; Lee, J.H.
- KIOST Author(s)
- Jung, Seung Won(정승원); Kang, Jung Hoon(강정훈)
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Alternative Author(s)
- 정승원; 권오윤; 윤석민; 강정훈
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Publication Year
- 2014
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Abstract
- To understand the effects of fluctuations in dam discharge due to river environments and phytoplankton communities, we monitored such environments and phytoplankton communities biweekly, from February 2001 to February 2002 and from February 2004 to February 2005, in the lower Han River (LHR), South Korea. The phytoplankton abundance during the dry season was approximately two times higher than that during the rainy season. In particular, fluctuations in diatom assemblages, which constituted over 70% of the total phytoplankton abundance, were affected severely by the changes in the discharge. When a large quantity of water in a dam was discharged into the LHR, the conductivity and the concentrations of total nitrogen (TN), total phosphorus (TP), and dissolved inorganic phosphorus (DIP) decreased rapidly, whereas the concentrations of suspended solids (SS), dissolved inorganic nitrogen (DIN), and dissolved silica (DSi) increased immediately. Time-delayed relationship also revealed that the dam discharge had an immediately significant negative relationship with phytoplankton abundance. On the whole, fluctuations in phytoplankton communities in the LHR were influenced much more by hydrodynamics such as dam discharge than by the availability of nutrients. Thus, the variability in these concentrations usually parallels the strength of river flow that is associated with summer rainfall, with higher values during periods of high river discharge. © 2014 The Ecological Society of Korea. All rights are reserved.
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ISSN
- 2287-8327
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/2941
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DOI
- 10.5141/ecoenv.2014.001
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Bibliographic Citation
- Journal of Ecology and Environment, v.37, no.1, pp.1 - 11, 2014
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Keywords
- Dam discharge; Lower Han river; Phytoplankton succession; Regulated river system; River hydrology; Time-delayed influence
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Type
- Article
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Language
- English
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Document Type
- Article
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