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대청호의 일차생산과 가두리양어장 및 유역으로부터의 유기물부하량
황길순,김동섭,허우명,김범철 ( Gilson Hwang,Dong Sup Kim,Woo Myung Heo,Bomchul Kim ) 한국하천호수학회 1994 생태와 환경 Vol.27 No.4
The total input of organic carbon into Lake Daechung was determined by measuring the primary production of phytoplankton, the organic carbon loading from the watershed, and the fecal discharge from netcage fishfarming. Primary productivity was estimated by photosynthesis-irradiance (P-I) model method using C-14 uptake. The loading from the watershed and output of organic carbon were determined by measuring COD of four main inlet streams and outflowing water. The discharge from fishfarms was estimated from the amount of fishfeed applied annually and the rate of COD discharge per unit weight of fishfeed. Daily productivity at the dam site and the fishfarm site was 200-900 and 200-2500mgC/m^2/day, respectively, falling in the range of meso-eutrophic lakes. The assimilation number at the fishfarm site was higher than that of the dam site, which seems to be the results of large nutrients discharge from the fishfarms. The organic carbon loading from the watershed, primary production, discharge from fishfarms were determined to be 4702, 11666, 794tC/yr, respectively. Most of organic carbon(68%) was contributed by autochthonous primary production of phytoplankton. Therefore, BOD removal of sewage in the watershed can not improve water quality of this lake, and phosphorus removal and subsequent phytoplankton reduction should be the major target to control for better water quality.