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Size-structure and Primary Productivity of Phytoplankton from Major Lakes in Sumjin and Yeongsan Watershed  

Yi, Hyang-Hwa (Division of Ocean System Engineering, Mokpo National Maritime University)
Shin, Yong-Sik (Division of Ocean System Engineering, Mokpo National Maritime University)
Yang, Sung-Ryull (Department of Environmental Engineering, College of Engineering Kwangju University)
Chang, Nam-Ik (Yeongsan-River Environment Research Laboratory, National Institute of Environmental Research)
Kim, Dong-Ho (Yeongsan-River Environment Research Laboratory, National Institute of Environmental Research)
Publication Information
Korean Journal of Ecology and Environment / v.40, no.3, 2007 , pp. 419-430 More about this Journal
Abstract
Physiochemical factors, phytoplankton biomass (Chl ${\alpha}$) and primary productivity were investigated seasonally in the three lakes of Dongbok, Juam, and Yeongsan during April 2004${\sim}$March 2006. Microphytoplankton dominated (>60%) in Dongbok lake, and phytoplankton biomass was high in the upper area, especially during April 2004, whereas they were high in the lower area during June 2004. In Juam lake, the high phytoplankton biomass in April 2004 was contributed by nanophytoplankton. In Yeongsan lake, chlorophyll a was high in August with high contribution of nanophytoplankton. Primary production was highest in Dongbok lake, and then followed by Yeongsan and Juam lakes. Regression analysis in Dongbok take showed that Chl ${\alpha}$ and primary production had close relations with secchi depth. In Juam lake, phosphate were correlated with the Chl ${\alpha}$, while temperature and TN was correlated with primary production in the lower area. In Yeongsan lake, Chl ${\alpha}$ have positively correlation with TN/TP. Primary production in the upper have high relationship with secchi depth, however, in the lower have high relationship with turbidity. Linear regression analysis showed that nutrients of nitrogen and phosphorus should be reduced for the protections in Juam and Dongbok lakes. We suggested that suspended solids and phytoplankton growth related to turbidity are needed to manage in Yeongsan lake.
Keywords
Dongbok lake; Juam lake; Yeongsan lake; chlorophyll ${\alpha}$; primary production;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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