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The Effects of Rainfall on Carbon Isotopes of POC in the Teshio River, Northern Japan

Published online by Cambridge University Press:  18 July 2016

Takafumi Aramaki ,
Seiya Nagao ,
Yo-hei Nakamura ,
Masao Uchida  and
Yasuyuki Shibata
Takafumi Aramaki*
Affiliation:
Environmental Chemistry Division, National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba, Ibaraki 305-8506, Japan
Seiya Nagao
Affiliation:
Low Level Radioactivity Laboratory, KU-INET, Kanazawa University, Wake, Nomi, Ishikawa 923–1224, Japan
Yo-hei Nakamura
Affiliation:
Faculty of Environmental Earth Science, Hokkaido University, N5W10, Kita-ku, Sapporo 060-0810, Japan
Masao Uchida
Affiliation:
AMS Facility (NIES-TERRA), National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba, Ibaraki 305–8506, Japan
Yasuyuki Shibata
Affiliation:
AMS Facility (NIES-TERRA), National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba, Ibaraki 305–8506, Japan
*
Corresponding author. Email: ara@nies.go.jp
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Abstract

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During a rainfall event in early September 2006, the transport behavior of particulate organic carbon (POC) in a small river (Teshio River, northern Japan) with alluvial plain and forest characteristics was investigated chiefly with carbon isotopes. The radiocarbon (Δ14C value) of POC varied widely from –56%‰ at the beginning of the rain event to –10%‰ at peak rainfall. The Δ14C values have a positive correlation with C/N ratios and a negative correlation with Δ13C values except for the data from when both turbidity and water level were at their maximums due to rainfall. These results indicate that the sources of organic matter in the river come from the surface layer of soil as the water level rises during a rainfall event.

Type
Methods, Applications, and Developments
Information
Radiocarbon , Volume 52 , Issue 2: 20th Int. Radiocarbon Conference Proceedings , 2010 , pp. 808 - 814
Copyright
Copyright © 2010 by the Arizona Board of Regents on behalf of the University of Arizona 

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