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http://dx.doi.org/10.15681/KSWE.2011.27.6.14

Short-term Effects of Turbid Water and Flow Rate on the Benthic Diatom Community in an Artificial Channel  

Kim, Baik-Ho (Department of Environmental Science, Konkuk University)
Park, Hye-Jin (Department of Environmental Science, Konkuk University)
Min, Han-Na (Department of Environmental Science, Konkuk University)
Kong, Dong-Su (Department of Biological Science, Kyunggi University)
Hwang, Soon-Jin (Department of Environmental Science, Konkuk University)
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Abstract
Short-term effects of current velocity and turbid water on the benthic diatom community and water quality were examined in artificial channel ($20{\times}200{\times}10cm$) with two different experiments. The first and second experiments were consisted of different current velocities such as 1 L/min., and 1, 3, and 6 L/min., respectively. The concentration of turbid water is prepared with loess and fixed at 10 and 20 times of the turbidity of control inflow (10 NTU, LTW), respectively. At experiment 1 (EXP-1), introduction of turbid water increased dissolved oxygen, electric conductivity, pH and turbidity, but there were no differences between low- (100 NTU, MTW) and high-turbid water (200 NTU, HTW). However, experiment 2 (EXP-2) did not change any environmental parameters except dissolved total and inorganic nitrogen like EXP-1. MTW in EXP-1 strongly stimulated the growth of benthic diatom, while both MTW (150 NTU) and HTW (300 NTU) in EXP-2 did not increase or decrease the diatom abundance. Over the study, the dominant species was four, Aulacoseira ambigua, Cyclotella stelligera, Aulacoseira granulata and Achnanthes minutissima. In EXP-1, two highest species in abundance, A. ambigua and A. granulata were highly grown in MTW, while Achnanthes minutissima high in HTW adversely. These results indicate that the introduction of turbid water can play an important role in the shift of water quality and benthic diatom community in stream ecosystem, especially inflow of soil water in low current velocity.
Keywords
Artificial channel; Benthic diatom; Current; Turbid water; Water quality;
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Times Cited By KSCI : 6  (Citation Analysis)
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