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Mohammad Jahidul Islam,장창원,음재성,정성민,신명선,이윤경,최영순,김범철 한국생태학회 2019 Journal of Ecology and Environment Vol.43 No.1
Background: Stoichiometry plays an important role in understanding nutrient composition and cycling processes in aquatic ecosystems. Previous studies have considered C:N:P ratios constant for both DOM (dissolved organic matter) and POM (particulate organic matter). In this study, water samples were collected in the six major rivers in Korea and were incubated for 20 days. C:N:P ratios were determined during the time course of the incubations. This allowed us to examine the changes in N and P contents of organic matter during decomposition. Results: POM and DOM showed significant differences in N and P content and the elemental ratios changed during the course of decomposition; DOM showed higher C:N and C:P ratios than POM, and the C:N and C:P ratios increased during decomposition, indicating the preferential mineralization of P over N and N over C. Conclusions: The N and P contents of organic matter in aquatic ecosystem are far from constant and vary significantly during decomposition. More detailed information on the changes in C:N:P ratios will provide improved understanding of decomposition processes and improved modeling of aquatic ecosystems.
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Stable carbon isotope signatures of zooplankton in some reservoirs in Korea
이재용,김범철,이윤경,장창원,Jeffrey S. Owen,김재구,음재성,성민정 한국생태학회 2013 Journal of Ecology and Environment Vol.36 No.3
Dissolved organic carbon (DOC) concentrations and zooplankton and particulate organic matter (POM) δ13C values were measured in five reservoirs in Korea. Zooplankton δ13C and POM δ13C showed large range from -33‰ to -22‰ and a significant difference among the reservoirs. One eutrophic reservoir, Lake Masan, showed unique characteristics with the highest zooplankton density, the highest δ13C, and the highest DOC. Zooplankton δ13C was similar to POM δ13C, implying that zooplankton occupies substantial portion of POM or that zooplankton isotopic composition is related to selective grazing and assimilation of food sources from bulk POM. Except Lake Masan zooplankton δ13C values were negatively correlated to DOC concentration in four reservoirs with mostly forest land use. This pattern can be probably attributed to intensive agricultural land use in the watershed of Lake Masan compared to the mostly forest land use in the other watersheds. Understanding the relationship between zooplankton δ13C values and the origin of organic matter associated with watershed characteristics will be valuable to better understand trophic relationships in reservoirs in the summer monsoon region.
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