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허우명 ( Heo U Myeong ),권상용 ( Kwon Sang Yong ),이재일 ( Lee Jae Il ),김동진 ( Kim Dong Jin ),김범철 ( Kim Beom Cheol ) 한국하천호수학회 2004 생태와 환경 Vol.37 No.1
The limnological chracteristics of a coastal lagoon were studied in Lake Hyangho, one of a series of brackish lagooms along the eastern coast of Korea. phytoplankton community structure, physical factors, and chemical factors were surveyed from May 1998 through November 2002 on a two-minth interval basis. Temperature, salinity, Secchi disc transparency, TN, TP, organic matter content of sediment, chlorophyll a concentration, dominant phytoplankton species, and phytoplankton cell density were measured. Salinity gradient was formed between the overlying frreshwater stream water and the permeated seawater at the bottom. The chemocline was persistent at the depth of 2∼5m that caused discontinuities of salinity, DO, and temperature profiles. The inversion of vertical temperature profiles with higher temperature in deeper layer was observed in early winter. Secchi disc transparency was very low with the range of 0.1 to 1.1m. TP, TN, and Chl.a concentration in the epilimnion was 0.011∼0.238㎎P L^(-1), 0.423∼2.443㎎N L^(-1), and 0.7∼145.2㎎ m^(-3), respectively. Sediment was composed of silt and coarse silt. COD, TP, and TN content of dry sediment were 19.7∼73.3㎎O₂g^(-1), 0.61∼1.32㎎Pg^(-1) and 0.64∼0.88㎎N g^(-1), respectively. Dominant phytoplankton species were chlorophytes (Qnkistro-desmus falcatus) and cyanobacteria (Oscillatoria sp. and Merismopedia tennuissima). The total cell density was in the range of 560∼35,255 cells mL^(-1).
허우명 ( Woo Myung Heo ),권상용 ( Sang Yong Kwon ),김범철 ( Bom Chul Kim ) 한국하천호수학회 2004 생태와 환경 Vol.37 No.4
A limnological survey was conducted in a reservoir, Lake Hoengsung located in Kangwondo, Korea, from July 2000 to September 2001 on the monthly basis. Phosphorus loading from the watershed was estimated by measuring total phosphorus concentration in the main tributary. Secchi disc transparency, epilimnetic (0-5 m) turbidity, chlorophyll a (Chl-α), total phosphorus (TP), total nitrogen (TN) and silica concentration were in the range of 0.9-3.5 m, 0.1-8.5 NTU, 0.3^(-3)2.4 ㎎Chl m^(-3), 5-46 ㎎P m^(-3), 0.83-3.55 ㎎N L^(-1) and 0.5-9.6 ㎎Si L^(-1), respectively. Green algae and cyanobacteria dominated phytoplankton community in warm seasons, from July through October, 2000. In July a green alga (Scenedesmus sp.) was dominant with a maximum cell density of 10,480 cells mL. Cyanobacteria (Microcystics sp.) dominated in August and September with cell density of 3,492 and 296 cells mL, respectively. Species diversity of phytoplankton was highest (2.22) in July. The trophic state of the reservoir can be classified as eutrophic on the basis of TP, Chl-α, and Secchi disc transparency. Because TP concentration was high in flood period, most of phosphorus loading was concentrated in rainy season. TP loading was calculated by multiplying TP and flow rate. The dam managing company measured inflow rate of the reservoir daily, while TP was measured by weekly surveys. TP of unmeasured days was estimated from the empirical relationship of TP and the flow rate of the main tributary; TP = 5.59Q^(0.45)(R2 = 0.47). Annual TP loading was calculated to be 4.45 tP yr^(-1), and the areal P loading was 0.77 gP m^(-2) yr^(-1) which is similar to the critical P loading for eutrophication by Vollenweider`s phosphorus model, 0.72 gP m^(-2) yr^(-1).
허우명 ( Heo U Myeong ),권상용 ( Kwon Sang Yong ),이재일 ( Lee Jae Il ),김동진 ( Kim Dong Jin ),김범철 ( Kim Beom Cheol ) 한국하천호수학회 2004 생태와 환경 Vol.37 No.1
Physicochemical parameters, plankton biomass, and sediment were surveyed from 1998 to 2000 at two months interaval in a eutrophic coastal lagoon(Lake Hwajinpo, Korea). The lake is separated from the sea by a narrow sand dune. Littoral zone is well vegetated with loating-leaved aquatic plants. The lake basin is divided into two subbasins by shallow sill. It has intrusion of seawater by permeation and stormy waves. Stable chemoclines are formed by salinity difference at 1m depth all the tear round. DO was often very low(>1㎎O₂L^(-1)) at hypolimnion. Temperature inversions were observered in November. nitrate and ammonium concentration were very low (<0.1㎎N L^(-1)), even though TN was usually 2.0∼3.5㎎N L^(-1). TN/TP was generally lower than the Redifield ratio. Transparency was 0.2∼1.7m, and COD, TP, and TN of sediment were 3.1∼40.3㎎O₂g^(-1), 0.91∼1.39㎎P g^(-1), and 0.34∼3.07㎎N g^(-1), respectively. Phytoplankton chlorophyll-a concentrations were mostly over 40㎎ m^(-3). Two basins showed differenct phytoplankton communities with Oscillatoria sp.,Trachelomonas sp., Schizochlamys gelatinosa, and Anabaena spiroides dominsnt in South basin, and with Trachelomonas sp., Schroederia sp., Schizochlamys gelatinosa, and Trachelomonas sp. dominant in the North basin. The seasonalsoccession of phytoplankton was very fast, possibly due to sudden changes in physical conditions, such as wind, turbidity, salinity and light.