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북한강 수계의 댐호수의 생산층에 있어서 요소분해와 회전속도
삼전촌서좌무 (三田村緖佐武),조규송,홍사욱,김해금 ( Osamu Mitamura,Kyu Song Cho,Sa Uk Hong,Hae Keum Lee ) 한국하천호수학회 1989 생태와 환경 Vol.22 No.3
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 CO₂ liberation rate into water from urea) in surface waters were 12, 80 and 54 μmol ureaㆍm^(-3) day^(-1), in Lake Soyang, Lake Chuncheon and Lake Euiam. The greater part of urea decomposition took place with the CO₂ liberation into water. High rates of urea carbon 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 CO₂ 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.