13C 추적자를 이용한 팔당호 수변역 부유 및 부착조류의 일차생산력과 광합성 색소 생산속도 연구

Abstract

팔당호 수변지역 내 부유조류와 부착조류의 일차생산력은 부착조류의 일차생산력이 더 높게 나타났다. 따라서 수변 지역이나 하천에서는 부착조류에 의한 유기물 생성이 주요한 수생태계 에너지 공급원이 될 것으로 판단된다. 본 연구를 통해 국내에서 처음으로 지표색소의 생산속도 분석결과가 제시되었는데 향후 일차생산력을 측정하는 데 있어서 조류의 총 일차생산력으로 국한된 측정 방법을 좀 더 세분화 하여 특정 조류의 기여도 및 개별 생산력을 판단하는 데 유용하게 사용될 것으로 사료된다.

The primary productivity and production rate of photosynthetic pigment of periphyton and phytoplankton were estimated using a 13C stable labeling technique in May 2011, in the waterfront of Lake Paldang. Primary productivity of periphyton (28.15 mgC m-2 d-1) was higher than phytoplankton production (0.14 mgC m-2 d-1). The net production rates of photosynthetic pigments (Chl a and Fucoxanthin) of periphyton were 2.53 ngC m-2 d-1 and 0.12 ngC m-2 d-1, respectively. On the other hand, the net production rate of pigments on phytoplankton (Chl a : 0.023 ngC m-2 d-1, Fucoxanthin: 0.002 ngC m-2 d-1) was lower than that of periphyton. Specific production rates of individual pigments of phytoplankton to the total primary productivity indicate the predominance of diatom (Fucoxanthin) species in phytoplankton assemblage in Lake Paldang. The net individual production rate of pigments by 13C tracer was a useful tool to estimate the contribution of each phytoplankton class for total primary productivity, and it is possible to calculate the seasonal contribution of each phytoplankton class to the total primary productivity in the aquatic ecosystems. This study is the first report on photosynthetic pigment production rates of periphyton and phytoplankton.