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3C-O3-M-1735 PDF
放射性炭素 Δ14C を用いた河川水系における有機物の動態研究
River systems play an important role on geochemical processes in watershed and the source of nutrient and organic matter to coastal marine environment. Land-use pattern in river watershed reflects water quality and bioavailable chemical compounds in river waters. Rain and snow events also influence water quality, transport flux and migration behavior of organic matter in river systems. To understand the transport processes and sources of organic matter, researchers have been applied tracers such as C/N ratio, δ13C, radiocarbon and biomarkers. Carbon isotopic compositions, δ13C and Δ14C, are useful tools because of identification of plant types (C3 and C4) and apparent age of organic matter. This presentation shows dynamics of organic matter in river systems including lake and coastal bay in marine environment determined by radiocarbon and stable carbon isotopes.