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조규송,김범철,허우명,조성주 ( Kyu Song Cho,Bom Chul Kim,Woo Myung Heo,Sung Ju Cho ) 한국하천호수학회 1989 생태와 환경 Vol.22 No.3
The phytoplankton community succession was surveyed in a mesotrophic reservoir, Lake Soyang, from 1984 to 1988. Asterionella was dominant in winter and spring blooms all through the study period. The dominant species in summer was Peridinium bipes in 1984 and 1985. However, it was replaced with a bluegreen alga, Anabaena microspora in 1986 late summer and after the first advent the period of blugreen algal dominance showed increasing tendency year by year through 1988. The standing crops of other major taxa, dinoflagellates, diatoms, and green algae, remained at the similar level during the study period except bluegreen algae. Local blooms of Peridinium were still observed at stream inlet sites after the advent of bluegreen algae in 1986. The species diversity decreased year by year, from average 0.81 of Shannon-Wiener index in 1985 to 0.55 in 1988 mainly due to the increasing dominance of Anabaena sp. Bluegreen algal bloom in a nitrogen-rich lake is the unique feature. Nitrate nitrogen was maintained always above 0.5 mgN/1 during the study period. The scarcity of heterocysts in trichomes of Anabaena implies that nitrogen fixation is not essential in Lake Soyang because of high nitrogen content. The mechanism of bluegreen dominance in this N-rich water is to be studied further.
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김범철,조규송,허우명,김동섭 ( Bom Chul Kim,Kyu Song Cho,Woo Myung Heo,Dong Sup Kim ) 한국하천호수학회 1989 생태와 환경 Vol.22 No.3
The trend of trophic status change in Lake Soyang from 1981 to 1989 was studied by the measrement of chlorophyll a concentration, transparency, total phosphorus concentration, and the rate of hypolimnetic oxygen deficit rate. And the phosphorus loading from the watershed was measured monthly at the main inflowing river, Soyang River. The increasing trend of chlorophyll was clear at the rate of 0.4 ㎍/ℓ/yr. The advent and expansion of Anabaena bloom was the major cause of chlorophyll increase and transparency reduction. The rate of hypolimnetic oxygen deficit also increased from 0.032㎎O₂/㎠/day in 1986 to 0.066 in 1988. The trophic state of Lake Soyang can be assessed as oligotrophy before 1983, mesotrophy from 1984 to 1988, and eutrophy since 1989. Phosphorus loading from floating net fishfarms was estimated to be larger than 45% of total. The phosphorus loading from only watershed is smaller than the dangerous critical loading, but, if the fishfarms loading added, it exceeds the critical loading.
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소양호 부영양화에 따른 N/P 비의 변화와 남조류 Bloom
허우명,김범철,조규송 ( Woo Myung Heo,Bomchul Kim,Kyu Song Cho ) 한국하천호수학회 1991 생태와 환경 Vol.24 No.4
After the first advent in 1986 two species of Anabaena spiroides and A. macrospora showed increasing dominacy year by year, which is thought to be enhanced by the increase of phosphorus concentration and the decrease of N/P ratio caused mainly by the phosphorus discharge from fishfarms within the lake. The bluegreen algal bloom in a water without nitrogen depletion is the unique feature in Lake Soyang. Nitratenitrogen was maintained always above 0.5 mg N/l throughout the year, though the NO_3-N/TP ratio decreased from 100 in 1984 to 50 in 1990 due to the increase of phosphorus content. High nitrogen concentration and scarcity of heterocyst in trichomes of Anabaena implies that nitrogen fixing ability is not critical for the bluegreen algal dominance in Lake Soyang. In the bag cultivation of Anabaena, the number of haterocysts increased with the addition of phosphorus which induced nitrogen depletion and the reduction of N/P ratio through algal growth.
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Enclosure 실험에 의한 환경요인이 소양호 식물플랑크톤 군집변화에 미치는 영향연구
허우명,김범철,조규송 ( Woo Myung Heo,Bomchul Kim,Kyu Song Cho ) 한국하천호수학회 1992 생태와 환경 Vol.25 No.2
Enclosures (1m diameter and 1.5m deep) established five at dam site during bloom of Peridinium bips in Lake Soyang. The changes of phytoplankton community were surveyed that the each enclosures controled by acid (pH 4.0 by HC1), CO_2(6.0∼7.01/min), aeration (21/min) and phosphate (0.1mg/1 by KH_2PO_4). The results indicated that Peridinium bipes appeared in the control and added phosphate bag all the time during the study periods. In addition, in the bag of added CO_2, Peridinium bipes disappeared during the adding CO_2, but it appeared again after stopped the adding CO_2. In added aeration and acid bag, Peridinium bipes was replaced with the Asterionella after a few days. And, although under the condition of low pH, acid bag after added the phosphate dominanted by Chlorophyte, Crytomonas of small cell size.
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김범철,조규송,허우명,김동섭 江原大學校 附設 環境硏究所 1989 環境硏究 Vol.6 No.-
The trend of trophic status change in Lake Soyang from 1981 to 1989 was studied by the measurement of chlorophyll a concentration, transparaency, total phosphorus concentration, and the rate of hypolimnetic oxygen deficit rate. And the phosphorus loading from the watershed was measured monthly at the main inflowing river, Soyan River. The increasing trend of chlorophyll was clear at the rate of 0.4 /￡㎍/l/yr. The advent and expansion of Anabaena bloom was the major cause of chlorophyll, increase and transparency reduction. The rate of hypolimnetic oxygen deficit also increased from 0.032 mg Ο_(2)/cm^(2)/day in 1986 to 0066 in 1988. The trophic state of Lake Soyang can be assessed as oligotrophy before 1983, mesotrophy from 1984 to 1988, and eutrophy since 1989. Phosphorus loading from floating net fishfarms was estimated to be larger than 45% of total. The phosphorus loading from only watershed is smaller than the dangerous critical loading, but, if the fishfarms loading added, it exceeds the critical loading.
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