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  1. D300 大学院環境学研究科
  2. D300a 雑誌掲載論文
  3. 学術雑誌

Accurate and precise quantification of atmospheric nitrate in streams draining land of various uses by using triple oxygen isotopes as tracers

http://hdl.handle.net/2237/24367
http://hdl.handle.net/2237/24367
c9f927b9-454f-41c8-93c9-8db950a3a48d
名前 / ファイル ライセンス アクション
Tsunogai_et_al_2016.pdf Tsunogai_et_al_2016.pdf (6.5 MB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2016-06-17
タイトル
タイトル Accurate and precise quantification of atmospheric nitrate in streams draining land of various uses by using triple oxygen isotopes as tracers
言語 en
著者 Tsunogai, Urumu

× Tsunogai, Urumu

WEKO 65916

en Tsunogai, Urumu

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Miyauchi, Takanori

× Miyauchi, Takanori

WEKO 65917

en Miyauchi, Takanori

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Ohyama, Takuya

× Ohyama, Takuya

WEKO 65918

en Ohyama, Takuya

Search repository
Komatsu, Daisuke D.

× Komatsu, Daisuke D.

WEKO 65919

en Komatsu, Daisuke D.

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Nakagawa, Fumiko

× Nakagawa, Fumiko

WEKO 65920

en Nakagawa, Fumiko

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Obata, Yusuke

× Obata, Yusuke

WEKO 65921

en Obata, Yusuke

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Sato, Keiichi

× Sato, Keiichi

WEKO 65922

en Sato, Keiichi

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Ohizumi, Tsuyoshi

× Ohizumi, Tsuyoshi

WEKO 65923

en Ohizumi, Tsuyoshi

Search repository
アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利
言語 en
権利情報 © Author(s) 2016. This work is distributed<br/>under the Creative Commons Attribution 3.0 License.
抄録
内容記述 Land use in a catchment area has significant impacts on nitrate eluted from the catchment, including atmospheric nitrate deposited onto the catchment area and remineralised nitrate produced within the catchment area. Although the stable isotopic compositions of nitrate eluted from a catchment can be a useful tracer to quantify the land use influences on the sources and behaviour of the nitrate, it is best to determine these for the remineralised portion of the nitrate separately from the unprocessed atmospheric nitrate to obtain a more accurate and precise quantification of the land use influences. In this study, we determined the spatial distribution and seasonal variation of stable isotopic compositions of nitrate for more than 30 streams within the same watershed, the Lake Biwa watershed in Japan, in order to use 17O excess (Δ17O) of nitrate as an additional tracer to quantify the mole fraction of atmospheric nitrate accurately and precisely. The stable isotopic compositions, including Δ17O of nitrate, in precipitation (wet deposition; n =  196) sampled at the Sado-seki monitoring station were also determined for 3 years. The deposited nitrate showed large 17O excesses similar to those already reported for midlatitudes: Δ17O values ranged from +18.6 to +32.4 ‰ with a 3-year average of +26.3 ‰. However, nitrate in each inflow stream showed small annual average Δ17O values ranging from +0.5 to +3.1 ‰, which corresponds to mole fractions of unprocessed atmospheric nitrate to total nitrate from (1.8 ± 0.3) to (11.8 ± 1.8) % respectively, with an average for all inflow streams of (5.1 ± 0.5) %. Although the annual average Δ17O values tended to be smaller in accordance with the increase in annual average stream nitrate concentration from 12.7 to 106.2 µmol L−1, the absolute concentrations of unprocessed atmospheric nitrate were almost stable at (2.3 ± 1.1) µmol L−1 irrespective of the changes in population density and land use in each catchment area. We conclude that changes in population density and land use between each catchment area had little impact on the concentration of atmospheric nitrate and that the total nitrate concentration originated primarily from additional contributions of remineralised nitrate. By using the average stable isotopic compositions of atmospheric nitrate, we excluded the contribution of atmospheric nitrate from the determined δ15N and δ18O values of total nitrate and estimated the δ15N and δ18O values of the remineralised portion of nitrate in each stream to clarify the sources. We found that the remineralised portion of the nitrate in the streams could be explained by mixing between a natural source with values of (+4.4 ± 1.8) and (−2.3 ± 0.9) ‰ for δ15N and δ18O respectively and an anthropogenic source with values of (+9.2 ± 1.3) and (−2.2 ± 1.1) ‰ for δ15N and δ18O respectively. In addition, both the uniform absolute concentration of atmospheric nitrate and the low and uniform δ18O values of the remineralised portion of nitrate in the streams imply that in-stream removal of nitrate through assimilation or denitrification had little impact on the concentrations and stable isotopic compositions of nitrate in the streams, except for a few streams in summer with catchments of urban/suburban land uses.
言語 en
内容記述タイプ Abstract
内容記述
内容記述 Published by Copernicus Publications on behalf of the European Geosciences Union.
言語 en
内容記述タイプ Other
出版者
言語 en
出版者 Copernicus Publications
言語
言語 eng
資源タイプ
資源タイプresource http://purl.org/coar/resource_type/c_6501
タイプ journal article
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
DOI
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 https://doi.org/10.5194/bg-13-3441-2016
ISSN
収録物識別子タイプ PISSN
収録物識別子 1726-4170
書誌情報 en : Biogeosciences

巻 13, p. 3441-3459, 発行日 2016-06
著者版フラグ
値 publisher
URI
識別子 http://doi.org/10.5194/bg-13-3441-2016
識別子タイプ DOI
URI
識別子 http://hdl.handle.net/2237/24367
識別子タイプ HDL
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