Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
권호 표지

Distribution, Vegetation Structure and Biomass of Submerged Macrophytes in a Small Agricultural Reservoir, Keumpoong Reservoir, Korea

소형 농업 저수지인 금풍저수지에서 침수식물의 분포, 식생구조 및 생물량

  • Received : 2012.01.14
  • Accepted : 2012.03.15
  • Published : 2012.03.31
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Abstract

Distribution, abundance and biomass of submerged macrophytes were assessed using a double-headed rake and an echo-sounder in the Keumpoong Reservoir to investigate the temporal and spatial variations of submerged macrophytes in a small agricultural reservoir located upstream. Slope steepness and water depth in the littoral zone were important controlling factors on flora and vegetation structure of submerged macrophytes. Biodiversity of submerged macrophytes was increased at a gentle slope of the littoral zone. The results of DCA (detrended correspondence analysis) showed that the structure of submerged vegetation depended on the depth of water. Submerged macrophytes were distributed at the maximum water depth of 2.8 m in the Keumpoong Reservoir. The area occupied by the submerged macrophytes was estimated at only 6% of the total reservoir area because of the steep slope of the littoral zone and the large annual water-level fluctuation of 3.5 m. The increase of water level and inflow of turbid water in the rainy season might reduce the biomass of submerged macrophytes in the reservoir. It may be concluded that submerged vegetation in the Keumpoong Reservoir, a small agricultural reservoir located at the upstream, appears to be particularly susceptible to water level fluctuations and slope steepness of the littoral zone.

하천 상류에 위치한 농업용 소형 저수지인 금풍지에서 침수식물의 분포와 수도의 공간적 시간적 변이를 파악하기 위하여, 양날갈퀴법과 음파탐지법을 이용하여 침수식물의 분포, 풍부도 및 생물량을 측정하였다. 침수식물의 출현종수와 식생구조는 연안대의 지형 경사도와 수심에 영향을 받았다. 침수식물 식물상의 종풍부도는 완만한 연안대에서 높았다. DCA (detrended correspondence analysis)에 의한 식생분석 결과에 의하면 침수식물의 식생구조는 수심에 의하여 영향을 받았다. 금풍저수지에서 침수식물은 최대 수심 2.8 m까지 분포하였다. 침수식물 분포지는 수변부 경사가 급하고 연간 수위변동폭이 3.5 m에 달하여 총수면적의 6%에 불과하였다. 침수식물의 생물량은 수위변동과 홍수기 탁수 유입으로 인하여 제한되었다. 결론적으로 하천 상류에 조성된 농업용 저수지인 금풍지에서 침수식물의 식생구조는 수심과 연안대 경사에 의하여 영향을 받았고, 연안대 경사가 급하고 연수위변동이 커서 침수식물의 분포와 생물량이 제한되었다.

Keywords

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