Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Control of Cyanobacteria (Microcystis aeruginosa) Blooms by Floating Aquatic Plant (Iris pseudoacorus): an in situ Mesocosm Experiment Using Stable ($^{13}C$, $^{15}N$) Isotope Tracers

$^{13}C$, $^{15}N$ 추적자 실험을 통한 부유 수생식물(Iris pseudoacorus)의 Cyanobacteria (Microcystis aeruginosa) 성장억제능력 평가

  • Received : 2011.08.11
  • Accepted : 2011.09.20
  • Published : 2011.09.30
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Abstract

Bottom-up approaches to control of Microcystis aeruginosa blooms were comparatively investigated through an in situ mesocosm experiment using aquatic plants (Iris pseudoacorus). In the mesocosm experiments, floating I. pseudoacorus, seemed to be effective in controlling massive M. aeruginosa blooms in an agricultural reservoir, exhibiting a close coupling with temporal variations in Chl-a and DO concentration. Shading by floating I. pseudoacorus resulted in a reduced phytoplankton abundance inhibiting light energy availability. Moreover, I. pseudoacorus may suppress phytoplankton growth through the excretion of chemical substances, likes a allelopathy, that inhibit phytoplankton photosynthetic activity. The $^{15}N$ atom % of I. pseudoacorus showed higher values than POM, suggesting that I. pseudoacorus assimilates DIN predominantly compared to phytoplankton, which was mostly M. aeruginosa. This result strongly suggests that the M. aeruginosa bloom should be regulated by aquatic plants, like I. pseudoacorus, this approach can affect zooplankton composition. This is the first study that has used stable isotope tracers to evaluate the biomanipulation efficiency through floating I. pseudoacorus.

생물조절기법(Biomanipulation)을 이용한 수질개선 방법으로서, 인공식물섬을 이용한 부유성 수생식물(I. pseudoacorus)은 그 표면적에 따라서 수층으로의 광량 투과를 제어함으로써 미세조류의 광합성 효율을 저해한다. 또한, 수층에서 영양염을 흡수하여, 미세조류의 성장을 억제함으로서 남조류(M. aeruginosa) 대량발생을 제어할 수 있다는 것을 $^{13}C$, $^{15}N$ 추적자 실험을 통하여 정량적으로 확인하였다. 이와 같이 부유수생식물을 이용하여 저수지내 남조류 번성을 억제함으로서 수질 개선에 중요한 역할을 하지만, 동물플랑크톤의 종 조성 변화를 야기할 수 있다는 것을 고려해야 할 것이다. 본 연구 결과는 향후 인공 식물섬을 사용한 남조류 제어 기법에 중요한 자료로 활용될 것으로 사료된다.

Keywords

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