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우리나라 저수지의 용도에 따른 호안 식물상 차이

Difference in Shoreline Flora According to the Usage of Reservoirs in Korea

  • 투고 : 2015.09.01
  • 심사 : 2015.09.16
  • 발행 : 2015.11.30

초록

저수지의 이용목적에 따라서 수력발전용, 농업용수용, 생활 공업용수용 및 홍수조절용으로 구분한 우리나라 35개 저수지의 호안에서 출현하는 관속식물 종류와 지형, 수문, 물 및 토양 환경을 조사하여 이용목적에 따른 호안 환경과 식물상 특성의 차이를 규명하고자 하였다. 호안의 식물상은 저수지의 용도에 따라서 종수, 종류 및 식물종 특성에서 차이를 나타내었다. 단계별 변수선택법 결과에 의하면 저수지 호안의 출현종수는 중앙수위에서 범람빈도가 높고 호안의 연평균노출기간이 길수록 증가하였다. 주좌표분석과 집괴분석의 결과에서 저수지 호안의 식물상은 이용목적에 따라서 크게 3가지 유형, 홍수조절용과 생활 공업용수용, 농업용 및 발전용 저수지로 구분이 되었다. 식물상의 특성에 영향을 미치는 주요한 환경 요인은 연간 수위변동폭, 중앙수위 연범람빈도, LQI 지수 및 연평균노출기간이었다. 수위가 안정적으로 유지되고 수질이 중영양으로 유지되는 발전용 저수지에서는 종풍부도가 높고 침수식물종을 비롯한 수생식물종이 풍부한 연안대가 발달하였다. 수위변동이 심하고 수질이 빈영양 혹은 중영양인 홍수조절용과 생활 공업용수용 저수지 식물상은 수위변동역에서 단명의 교란지식물이 분포하였다. 수위변동이 중간 정도이고 중영양 또는 부영양인 농업용 저수지에서는 부엽식물과 부유식물과 같은 수면을 덮는 식물종이 특징적으로 분포하였다. 결론적으로 저수지 호안의 식물상 특성은 이용목적에 따라서 수위변동, 수질 등의 환경요인이 차이가 나타나고 이에 따라서 식물상의 구조와 종풍부도가 다르게 나타났다.

Differences in characteristics of flora and environmental factors of geomorphology, hydrology, water quality and soil were investigated in the shoreline of total 35 reservoirs according to their usages of waterpower generation, agricultural water supply, residential and industrial water supply and flood control in Korea. The number of plant species, floral structure and characteristics of species traits in the shoreline of reservoirs were different according to their usage. From the results of stepwise regression analysis, the total number of vascular plant species was increased at the environment of the higher flood frequency at the median water level and the longer exposure duration of the shoreline. The results of principal coordinates analysis and cluster analysis showed that the shoreline flora was classified as the 3 types of 1) flood control and residential and industrial water supply, 2) agricultural water supply and 3) waterpower generation reservoirs. The water level fluctuation, flood frequency at the median water level, lake water quality index and exposure duration of the shoreline were selected as important environmental factors affected on the characteristics of shoreline flora. The species richness of total flora and hydrophytes, especially submerged macrophytes, were much higher in the reservoirs for the purpose of the waterpower generation in which mesotrophic water quality and stable water levels were maintained. Annual or biennial ruderals were established on the ephemeral drawdown zone of flood control, residential and industrial water supply reservoirs which have oligotrophic or mesotrophic water quality and wide range of water level fluctuation. The floating hydrophytes were differentially dominated in the littoral zones of the agricultural water supply reservoirs with a mesotrophic or eutrophic water quality and a medium water level fluctuation. In conclusion environmental factors related to water level fluctuation and water quality were different and then the floral characteristics of shoreline were distinguishable according to usage of Korean reservoirs.

키워드

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