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High Contribution of Recalcitrant Organic Matter to DOC in a Japanese Oligotrophic Lake Revealed by 14C Measurements

Published online by Cambridge University Press:  18 July 2016

Fumiko Watanabe Nara ,
Akio Imai ,
Masao Uchida ,
Kazuo Matsushige ,
Kazuhiro Komatsu ,
Nobuyuki Kawasaki ,
Yasuyuki Shibata ,
Kunihiko Amano ,
Hajime Mikami  and
Ryuji Hanaishi
Fumiko Watanabe Nara*
Affiliation:
National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
Akio Imai
Affiliation:
National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
Masao Uchida
Affiliation:
National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
Kazuo Matsushige
Affiliation:
National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
Kazuhiro Komatsu
Affiliation:
National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
Nobuyuki Kawasaki
Affiliation:
National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
Yasuyuki Shibata
Affiliation:
National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
Kunihiko Amano
Affiliation:
Public Works Research Institute, 1-6 Minamihara, Tsukuba, Ibaraki 305-8516, Japan
Hajime Mikami
Affiliation:
Aomori Prefectural Institute of Public Health and Environment, Aomori, Aomori 030-8566, Japan
Ryuji Hanaishi
Affiliation:
Aomori Prefectural Institute of Public Health and Environment, Aomori, Aomori 030-8566, Japan
*
Corresponding author. Email: fumiko.watanabe@ulg.ac.be.
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Abstract

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Carbon isotopes (14C and 13C) of dissolved organic carbon (DOC) in a Japanese oligotrophic lake (Lake Towada) were measured to study the origin and cycling of dissolved organic matter (DOM) in Lake Towada. Lake water samples were collected at 3 depths (0, 30, and 80 or 85 m) during 4 months (April, June, August, and October) in 2006. 14C measurements of DOC were performed by accelerator mass spectrometry (AMS) at the National Institute for Environmental Studies (NIES-TERRA) in Japan. Δ14C and δ13C values of DOC in Lake Towada showed light carbon isotopic values ranging from –750 to −514‰ and –29.0 to –27.8‰, respectively. These values are similar to those of humic substances reported. The very low carbon isotopic values of DOC in Lake Towada suggest a very small contribution of DOC derived from fresh phytoplankton to the lake DOC. There is an extremely high linear relationship between the Δ14C and δ13C of DOC in Lake Towada when all data points are plotted (r2 =0.818, p < 0.01), suggesting that the DOC in Lake Towada has 2 specific sources contributing heavy and light carbon isotopes. Although the freshly produced DOC of phytoplankton origin can be decomposed easily, the variation in the autochthonous DOC should influence the carbon isotopic values of DOC in Lake Towada.

Type
Freshwater and Groundwater
Information
Radiocarbon , Volume 52 , Issue 3: 20th Int. Radiocarbon Conference Proceedings , 2010 , pp. 1078 - 1083
Copyright
Copyright © 2010 by the Arizona Board of Regents on behalf of the University of Arizona 

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