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Relationships between dissolved black carbon and dissolved organic matter in streams

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Title: Relationships between dissolved black carbon and dissolved organic matter in streams
Authors: Yamashita, Youhei Browse this author →KAKEN DB
Kojima, Daiki Browse this author
Yoshida, Natsumi Browse this author
Shibata, Hideaki Browse this author →KAKEN DB
Keywords: Dissolved black carbon
Dissolved organic matter
Issue Date: May-2021
Publisher: Elsevier
Journal Title: Chemosphere
Volume: 271
Start Page: 129824
Publisher DOI: 10.1016/j.chemosphere.2021.129824
Abstract: Black carbon (BC) is a pyrolyzed product derived from incomplete combustion. A major fraction of BC produced by landscape fires is initially deposited onto onsite soils. Atmospheric deposition of soot is known to be an important source of soil BC, especially in watersheds that are not affected by landscape fires. The transport of the dissolved fraction of oxidized BC in soil, defined as dissolved black carbon (DBC), to streams is considered one of the important loss pathways of BC in soil, but the mechanism is not well documented. We measured the quantity and quality of DBC, determined by a benzenepoly-carboxylic acid method, and the quantitative and qualitative parameters of bulk dissolved organic matter (DOM) in streams in Hokkaido, northern Japan, whose catchments were not affected by landscape fire for at least 110 years. DBC with relatively low polycondensed signatures occurred in the streams, irrespective of differences in watershed characteristics and seasons, suggesting that atmospheric deposition of soot into the catchment is probably a major source of stream DBC. The DBC concentration was linearly related to the dissolved organic carbon (DOC) concentration, irrespective of the differences in watershed characteristics and seasons. Furthermore, the polycondensation degree of DBC was observed to correlate with the qualitative parameters of bulk DOM. Such quantitative and qualitative relationships between DBC and bulk DOM imply that the transfer mechanism from soils to streams of soot-derived polycondensed DBC is linked with that of higher plant-derived, high-molecular-weight aromatic DOM. (C) 2021 Elsevier Ltd. All rights reserved.
Rights: © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山下 洋平

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