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RISS 인기검색어
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- 저자 : 이해금 ( Osamu Mitamura (검색결과 2 건)
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북한강수계 (北漢江水系) 인공호에 있어서 식물플랑크톤에 의한 요소분해와 그 크기 분포
삼전촌서좌무 (三田村緖佐武),조규송,홍사욱,이해금 ( Osamu Mitamura,Kyu Song Cho,Sa Uk Hong,Hae Keum Lee ) 한국하천호수학회 1990 생태와 환경 Vol.23 No.4
The influence of natural phytoplankton cell classes upon the response of urea decomposition was investigated in four reservoirs - Lakes Paro, Chuncheon, Soyang and Uiam - in the North Han River System. The decomposition rate of urea was 0.3 to 29.4 μ㏖ urea m^(-3) · hr.^(-1) in the light and 0.2 to 14.9 μ㏖ urea · m^(-3)·hr.^(-1) in the dark. Much higher decomposition rates were observed at the eutrophic stations in Lake Uiam. The urea decomposition in the smaller fraction (<5 ㎛) exceeded that in the middle (5∼25 ㎛) and the larger fraction (>25㎛). No differences in the ratios of urea decomposition to chlorophyll-a or photosynthesis among three fractions were observed. These trends were no different between sampling areas and reservoirs. This may be mainly due to the difference in the standing crop of phytoplankton. The greater part of urea decomposition was the phase of the CO₂ liberation rate into water. 8 to 50% of the urea decomposition was incorporated into the particulate phase in the light, but this was much lower in the dark. A close relationship between urea decomposition and chlorophyll-a or photosynthesis was observed in the three fractions, which have high correlation coefficients. The results of the present study indicate that urea in reservoirs decomposes by phytoplankton rather than bacteria, and thus phytoplankton is more competitive than bacteria.
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삼전촌서좌무,조규송,홍사욱,이해금 江原大學校 附設 環境硏究所 1989 環境硏究 Vol.6 No.-
The in situ rate of urea decomposition was measured in the euphotic layer of three reservoirs located in the North Han River System. The urea decomposition rates (as sum of incorporation rate of urea carbon into particulate matter and CO_(2) liberation rate into water from urea) in surface waters were 12, 80 and 54 μmol urea · m^(-3) day^(-I), in Lake Soyang, Lake Chuncheon and Lake Euiam. The greater part of urea decomposition took place with the C0_(2) liberation into water. High rates of urea carbo incorporation were obtained at surface layer, while low rates were found in lower layer and the dark bottles. The decomposition rate of urea, the carbon incorporation rate, and the CO_(2) liberation rate decreased with depth. The vertical distributions of the urea decomposition rate showed similar patterns to those of photosynthesis. The turnover rates of urea in the three reservoirs were calculated respectively as 41,6.1 and 3.4 days at the surface, and the values increased with depth. 북한강수계 3개 인공호수의 생산층에 있어서 현장법으로 요소 분해속도를 측정했다. 요소분해속도(요소에서 유래도는 탄소가 수중생물로 흡수되는 량과 이산화탄소로서 수중에 방출되는 량의 합)는 소양호, 춘천호 및 의암호의 표층수에서 각각 12, 80, 54μmol Urea m^(-3)·day^(-1)였다. 요소 분해는 대부분이 이산화탄소 형태로 수중에 방출된다. 요소태탄소의 흡수속도는 표층에서 높은 값이 관찰됐으나 생산층의 하층 및 암조건에서는 낮았다. 요소분해속도, 요소태탄소의 흡수속도 및 이산화탄소의 방출 속도는 깊이에 따라 감소됐다. 요소분해속도와 광합성의 수직분포는 유사하였다. 각 호수의 표층수에 있어서 회전시간은 소양호, 춘천호 및 아ㅢ암호에서 4.1, 6.1 및 3.41일로 계산되며 이 값은 깊이에 따라 증가됐다.
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