영산강과 섬진강 수계의 질소 분포와 유기질소 분해속도

초록

The distribution of organic nitrogen and its decomposition rate were studied in the Youngsan River and the Sumjin River system in Korea. Samples were conducted seasonally in June, August, December of 2006, and February of 2007. Collected samples were incubated for 20 days in a dark chamber (20±1°C) and analyzed the changes of nitrogen form (particulate organic nitrogen, dissolved organic nitrogen, ammonia, nitrite, and nitrate). The mean total nitrogen (TN) concentration in the Youngsan River and the Sumjin River were 2.62 mgN･L-1 and 1.53 mgN･L-1, respectively. TN comprised of 65% DIN and 35% ON. The decomposition coefficients of organic nitrogen were also determined by two different fitting models. The decomposition rates of nitrogen species (TON, LPON, LDON, NH4+ and NO2-) ranged from 0.024 to 1.043 day-1 in the Youngsan River and 0.008 to 0.693 day-1 in the Sumjin River, respectively. The result of this study can give a guide to the selection of parameters in the calibration processes of water quality models.

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