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The Distribution of DOM and POM and the Composition of Stable Carbon Isotopes in Streams of Agricultural and Forest Watershed Located in the Han River System  

Kim, Jai-Ku (Department of Environmental Science, Kangwon National University)
Kim, Bom-Chul (Department of Environmental Science, Kangwon National University)
Jung, Sung-Min (Department of Environmental Science, Kangwon National University)
Jang, Chang-Won (Department of Environmental Science, Kangwon National University)
Shin, Myoung-Sun (Department of Environmental Science, Kangwon National University)
Lee, Yun-Kyoung (Department of Environmental Science, Kangwon National University)
Publication Information
Korean Journal of Ecology and Environment / v.40, no.1, 2007 , pp. 93-102 More about this Journal
Abstract
The runoff characteristics of organic matter in turbid water were investigated in eleven tributary streams of the Han River system, Korea. The flow-weighted event mean concentrations of organic matter ranged from 1.5 to 3.2 mg $L^{-1}$ of DOM and 2.2 of 29.1 mg $L^{-1}$ of POM, respectively. The SUVA value which reflects the proportion of humic substance in organic matters was higher during the rainfall season, meaning that the runoff of refractory form increase in this period. Stable carbon isotope ratios of both POM and DOM were different among streams, which reflect the sources of organic matter. DOM isotope ratios were less depleted of $^{13}C$ than that of POM by approximately 1 to $2%_{\circ}$ ${\delta}^{13}C$ of the several turbid streams (the Mandae Stream, the Jawoon Stream, and the Daegi stream) were heavier than those of clear streams. ${\delta}^{13}C$ values in the turbid upstream tributaries were similar to those of downstream reaches (such as the Soyang River, the Sum River, and the Seo River). From the ${\delta}^{13}C$ analysis of POM it could be calculated that $C_4$ pathway contributed approximately 15.9 to 23.6% of organic matter in several turbid upstream sites, and over 20% in the three sites of large downstream reaches. On the contrary it contributed only 9.1 to 12.8% in clear streams of forest watersheds. In the Soyang River, $C_4$ pathway organic matter contributed 8.8% of the DOM pool.
Keywords
DOM; POM; humic substance; SUVA; stable carbon isotope; $C_3$-plant; $C_4$-plant;
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