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Trophic Conditions of Man-Made Reservoirs Within Keum-River Watershed and Geographical Dynamics in Empirical Relations of Chlorophyll-$a$ to Some Other Parameters  

Lee, Jae-Yon (Environmental Biotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB))
Oh, Hee-Mock (Department of Biological Science, School of Biological Sciences and Biotechnology, Chungnam National University)
An, Kwang-Guk (Environmental Biotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB))
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Abstract
In this study, we identified spatial and temporal patterns of reservoir trophic state within Keum-river watershed and analyzed correlations between chlorophyll-$a$ (Chl-$a$) and water quality parameters including conductivity and total phosphorus (TP). The reservoirs were separated into three trophic categories by the criteria of TP: 2 oligotrophic (9.3~9.4 ${\mu}g\;L^{-1}$), 15 mesotrophic (10.3~19.2 ${\mu}g\;L^{-1}$), and 14 eutrophic reservoirs (38.9~117.1 ${\mu}g\;L^{-1}$). Water quality parameters such as conductivity, TP, and Chl-$a$ reflected rainfall patterns, and the patters of annual mean TP were similar to the variation of annual mean Chl-$a$. Empirical models of Chl-$a$ against TP in reservoirs showed that statistical significance ($p$ <0.05) occurred in only some seasons and the trophic relations were modified by a washing-out effect or high non-algal light attenuation.
Keywords
empirical model; reservoir; Chl-a; seasonal variation;
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