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회야댐 저수지에서 물리,화학적 환경요인에 따른 식물플랑크톤과 세균 군집의 변화
김대균 ( Kim Dae Gyun ),최애란 ( Choe Ae Lan ),이혜경 ( Lee Hye Gyeong ),권오섭 ( Kwon O Seob ),김종설 ( Kim Jong Seol ) 한국하천호수학회 2004 생태와 환경 Vol.37 No.1
We inverstigated the effect of physicochemical environmental factors on the community dynamics of phytoplanktons and bacteria at the Hoeya Dam Reservoir, a drinking water reservoir for Ulsan city. Water samples were collected and analyzed every two to four weeks at three sites alon the reservoir from April to October, 2001. During the study period, the Secchi depths were between 0.4 and 3.5m. At the surface layer of water column, temperature ranged 10.2∼32.0℃, pH 7.3∼9.6, dissolved oxygen 5.5∼12.4㎎L^(-1),BOD_(5)0.8∼5.0㎎L^(-1),COD_(Mn)3.7∼10.0㎎L^(-1),and Chl-a 8.9∼60.9㎎ m^(-3). At the bottom layer, tenperature varied 7.2∼28.9℃, pH 7.1∼9.3, dissolved oxygen 0.6∼9.7㎎L^(-1), BOD_(5)0.8∼4.5㎎L^(-1),COD_(Mn)3.9∼10.0㎎L^(-1),and Chl-a 4.3∼81.9㎎ m^(-3). The numbers of phytoplanktons were 7.4×10²∼2.6×10^(5) cells mL^(-1) at surface and 2.5×10²∼2.4×10⁴cells mL^(-1) at bottom, and were positively correlated with water temperature and Chl-a concentration. Genus Stephanodiscus and genus Oscillatoria dominated on April and on May, respectively. Cyanobacterial boolms of Aphanizomenon, Microcystis, Anabaena were observed from June to early Srptember, and thereagter Stephanodiscus and Aulacoseria dominated again. Total microbial counts tanged 1.73×10⁴∼1.68×10^(5) cells mL^(-1), and were positively correlated with water temperature and phytoplankton counts at surface water. Heterotrophic plate counts (HPCs) ranged 30∼4.1×10³CFU mL^(-1), and were positively correlated with BOD_(5) and NO₃^(-)-n concentration at bottom water. Unlike the total microbial counts, the numbers of fecal coliforms and fecal streptococci as well as HPCs were higher at the bottom than the surface layer and were highest at the upper a site among the three sampling sites. Since the concentrations of fecal coliforms and strsptococci were still high at the bottom of site c, where intake for water tratment plant is located, it appeared that special management of water treatment processed may be needed especially after strong rainfall.
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