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한국육수학회지 = Korean journal of limnology v.40 no.1, 2007년, pp.121 - 129   피인용횟수: 6

부영양 저수지에서 남조류의 발달과 천이 및 영향 요인
Cyanobacterial Development and Succession and Affecting Factors in a Eutrophic Reservoir

김호섭   (국립환경과학원 한강물환경연구소CC0187457  ); 황순진   (건국대학교 환경과학과UU0000050  ); 공동수   (국립환경과학원 한강물환경연구소CC0187457  );
  • 초록

    본 연구는 부영양 저수지에서 남조류의 발달과 천이에 영향을 미치는 요인들과 그 결과를 평가하기 위하여, 2003년 3월부터 2004년 2월까지 현장 조사를 통하여 남조류 종조성과 밀도변화, 침전특성, 퇴적물 특성을 분석하였다. 또한 인, 수온, 광도를 달리한 조건에서의 남조류 성장률을 비교하였다. 식물플랑크톤은 봄철(3 ${\sim}$ 4월)에 규조류와 편모조류가 우점한 시기를 제외하고는 연중 남조류가 우점하였고, 7월과 11월에 높은 밀도 증가가 관찰되었다. 남조류 우점기간 중 5월에는 Oscillatoria spp., 6월에는 Aphanizomenon sp.이 우점하였고, 7월부터 11월까지는 Microcystis spp.가 우점종으로 나타났다. Oscillatoria spp.가 우점하고 침강율이 높았던 5월에는 수온, 광도 그리고 TN/TP비가 높았던 반면, Microcystis spp.가 우점한 7월부터 11월까지의 TN/TP비는 상대적으로 낮은 범위 (평균 27)를 보였다. 침강속도는 규조류가 우점한 3월 가장 높았고, 남조류의 우점종 기간 중에서는 5월과 10월이 다른 시기와 비교할 때 빨랐다. 퇴적물의 C/N비는 $6{\sim}8$ 의 범위였고, 간극수내 무기인의 농도는 심층에 산소농도가 희박( $O_2$ $L^{-1}$ )하였던 시기에 감소하였다. 남조류의 성장률은 영양염 농도와 수온에 크게 의존하였고, 특히 높은 인 농도는 낮은 수온에서도 남조류가 발달하는 원인으로 나타났다. 본 연구의 결과는, 인이 충분하게 공급되는 국내의 많은 소형 부영양 저수지에서 연중 남조류의 발달과 지속가능성을 시사하며, 수질개선과 조류제어를 위해 인의 저감(특히, 퇴적층 관리)을 매우 중요하게 고려해야 함을 강조한다.

    This study was conducted to evaluate the causes and effects of cyanobacterial development and succession in a shallow eutrophic reservoir from March 2003 to February 2004. Phytoplankton succession, sedimentation rate, and sediment composition were analyzed. Algal bioassay also was conducted with the consideration of light, water temperature and nutrients. Cyanobacteria dominated throughout the year, except for spring season (March ${\sim}$ April) in which diatoms and flagellates dominated. Total cell density increased in July and November when P loading through inflows was high. Oscillatoria spp. and Aphanizomenon sp. were dominant in May and June, respectively, but replaced with Microcystis spp. in July. Thereafter, Microcystis spp. sustained until December, and again shifted to Oscillatoria spp. and Aphanizomenon sp. The dominance of Oscillatoria spp. in May was accompanied with high TN/TP ratio and the increase of water temperature and light intensity. While the dominance of Microcystis spp. was related with relatively low TN/TP ratio, ranging from 46 to 13 (average: 27). The sedimentation rate was highest in March (0.6 m $day^{-1}$ ) when diatoms dominated. During the period of cyanobacterial dominance, relatively high sedimentation rate was observed in May (0.4 m $day^{-1}$ ) and October (0.36m $day^{-1}$ ). C/N ratio of the sediment ranged $6{\sim}8$ . Inorganic P concentration in the pore water was low when DO concentration was $O_2$ $L^{-1}$ in the hypolimnion, reflecting the P release from the sediment. Cyanobacterial growth rate depended on phosphorus concentration and water temperature, and high P concentration compensated for the low temperature in the growth rate. Our results suggest that the potential of cyanobacterial development and substantiality in eutrophic reservoirs be high throughout the year, as being supplied with enough P, and emphasize the consideration of sediment man. agement for the water quality improvement and algal bloom control.

  • 주제어

    Cyanobacteria .   eutrophic reservoir .   TN/TP ratio .   phosphorus .   sediment management.  

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  • 이 논문을 인용한 문헌 (6)

    1. Kim, Ho-Sub ; Hwang, Soon-Jin ; Kong, Dong-Soo 2008. "Growth Kinetics of Phytoplankton in Shallow Eutrophic Reservoir" 水質保全 = Journal of Korean Society on Water Quality, 24(5): 550~555     
    2. Yoon, Jong-Su ; Jeong, Hyun-Gi ; Kwon, Young-Ho ; Shin, Chan-Ki ; Hwang, Dong-Jin 2008. "Seasonal Changes of Zooplankton Distribution with Environmental Factors in Lake Jinyang" 환경위생공학 = Journal of environmental and Sanitary engineering, 23(4): 45~54     
    3. An, Kwang-Guk ; Kim, Jae-Kyeng ; Lee, Sang-Jae 2008. "Reservoir Trophic State and Empirical Model Analysis, Based on Nutrients, Transparency, and Chlorophyll-${\alpha}$ Along with Their Relations Among the Parameters" 환경생물 = Korean journal of environmental biology, 26(3): 252~263     
    4. Lee, Hae-Jin ; Seo, Jung-Kwan ; Jeong, Hyun-Ki ; Tak, Bo-Mi ; Lee, Jae-Kwan 2010. "Phytoplankton Community in Junam Reservoir by Pollution Sources, Loads and Water Quality" 한국환경과학회지 = Journal of the environmental sciences, 19(11): 1445~1456     
    5. Chung, Se Woong ; Lee, Heung Soo 2011. "Analysis of Microcystis Bloom in Daecheong Reservoir using ELCOM-CAEDYM" 水質保全 = Journal of Korean Society on Water Quality, 27(1): 73~87     
    6. Ham, Eun Kyung ; Choi, Yun Eui ; Kim, Min ; Chon, Jinhyung 2015. "A Study on the Water Quality Management of Modular Revetment Structure installed Low-Maintenance Constructed Wetland" 한국습지학회지 = Journal of wetlands research, 17(2): 184~192     

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