Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Relationship between Phytoplankton Community and Water Quality in Lakes in Jeonnam using SOM

SOM을 이용한 전남 호소의 식물플랑크톤 군집과 수질 관계 분석

  • Cho, Hyeon Jin (Department of Biological Sciences and Biotechnology, Chonnam National University) ;
  • Na, Jeong Eun (Yeongsan River Environmental Research Center) ;
  • Jung, Myoung Hwa (Department of Biological Sciences, Chonnam National University) ;
  • Lee, Hak Young (Department of Biological Sciences, Chonnam National University)
  • 조현진 (전남대학교 자연과학대학 생물과학.생명기술학과) ;
  • 나정은 (국립환경과학원 영산강물환경연구소) ;
  • 정명화 (전남대학교 자연과학대학 생물학과) ;
  • 이학영 (전남대학교 자연과학대학 생물학과)
  • Received : 2017.02.15
  • Accepted : 2017.03.20
  • Published : 2017.03.31
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Abstract

In this study, we analyzed the relationship between phytoplankton community and physicochemical factors in 12 lakes located in Jeollanam-do based on the data surveyed from March to November 2014. Totally, 297 species of phytoplankton were identified including 98 Bacillariophyceae, 148 Chlorophyceae, 23 Cyanophyceae and 28 other phytoplankton taxa. The standing crops ranged from 124 to $59,148cells\;mL^{-1}$ and showed the highest in August with the increase of Cyanophycean cells. The self-organizing map (SOM) was optimized into $9{\times}6$ grid and was classified into 5 clusters based on the similarity of environmental factors and phytoplankton indices. The SOM results showed that phytoplankton communities had positive relationship with water temperature, SS, DO, BOD, TP and Chl-a, whereas low relationship with pH, TN, $NH_3-N$, $NO_3-N$, $PO_4-P$ and Conductivity. In Pearson's correlation coefficient, relationship between environmental factors and phytoplankton communities showed similar results with SOM.

전라남도에 위치한 12개의 호소에서 식물플랑크톤 군집변화 양상 및 환경요인과 시공간적 특징의 상관관계를 알아보기 위하여 2014년 3월부터 11월까지 총 4차례에 걸쳐 조사를 시행하였다. 전체 조사기간 동안 출현한 식물플랑크톤은 총 297종으로, 규조류 98종, 녹조류 148종, 남조류 23종, 그 외 와편모조류를 포함한 기타조류 28종으로 확인되었고, 조사시기별 출현종은 3월 116종, 6월 163종, 8월 162종, 11월 169종으로 1차 조사를 제외한 대부분의 시기에 다소 높은 출현종수를 보였다. 조사기간 동안 확인된 식물플랑크톤의 개체수는 $124{\sim}59,148cells\;mL^{-1}$의 범위를 나타냈고, 조사시기별 평균 출현개체수는 3월 $3,443cells\;mL^{-1}$, 6월 $4,055cells\;mL^{-1}$, 8월 $11,763cells\;mL^{-1}$, 11월 $4,614cells\;mL^{-1}$로 봄철에서 여름철로 계절이 진행되면서 증가한 후 가을철로 접어들면서 다시 감소하는 경향을 보였는데 이는 남조류의 개체수 변화에 따른 결과로 확인되었다. 식물플랑크톤 군집과 이화학적 요인을 이용한 SOM 분석 결과 $9{\times}6$ 격자에서 최적화되었고, 5개의 그룹으로 분류되었다. SOM 분석을 통한 식물플랑크톤의 군집과 연관이 있는 이화학적 요인은 수온, SS, DO, BOD, TP, Chl-a로 확인되었고 pH, TN, $NH_3-N$, $NO_3-N$, $PO_4-P$, 전기전도도 등은 관련성이 낮은 것으로 나타났다. 식물플랑크톤 군집과 이화학적 요인 간의 Pearson's correlation coefficient를 산출한 결과 식물플랑크톤의 군집은 대체로 수온, DO, SS, TP, 전기전도도, Chl-a와 통계적 유의성을 보였고, pH, TN, $NH_3-N$, $NO_3-N$, $PO_4-P$ 등과는 유의성이 낮은 것으로 확인되었다. 결론적으로 전라남도 내 주요 호소에서의 식물플랑크톤 군집의 분포는 주로 수온, SS, DO, BOD, Chl-a와 관계가 있는 것으로 확인되었고 pH, TN, $NH_3-N$, $NO_3-N$, $PO_4-P$와의 관련성은 낮은 것으로 확인되었다.

Keywords

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