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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

Export flux of unprocessed atmospheric nitrate from temperate forested catchments: a possible new index for nitrogen saturation

http://hdl.handle.net/2237/00029078
c8d70af3-68a8-492f-9dc0-9f9ca28c0b32
名前 / ファイル ライセンス アクション
bg-15-7025-2018.pdf bg-15-7025-2018 (5.6 MB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2018-11-26
タイトル
タイトル Export flux of unprocessed atmospheric nitrate from temperate forested catchments: a possible new index for nitrogen saturation
著者 Nakagawa, Fumiko

× Nakagawa, Fumiko

WEKO 88031

Nakagawa, Fumiko

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Tsunogai, Urumu

× Tsunogai, Urumu

WEKO 88032

Tsunogai, Urumu

Search repository
Obata, Yusuke

× Obata, Yusuke

WEKO 88033

Obata, Yusuke

Search repository
Ando, Kenta

× Ando, Kenta

WEKO 88034

Ando, Kenta

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Yamashita, Naoyuki

× Yamashita, Naoyuki

WEKO 88035

Yamashita, Naoyuki

Search repository
Saito, Tatsuyoshi

× Saito, Tatsuyoshi

WEKO 88036

Saito, Tatsuyoshi

Search repository
Uchiyama, Shigeki

× Uchiyama, Shigeki

WEKO 88037

Uchiyama, Shigeki

Search repository
Morohashi, Masayuki

× Morohashi, Masayuki

WEKO 88038

Morohashi, Masayuki

Search repository
Sase, Hiroyuki

× Sase, Hiroyuki

WEKO 88039

Sase, Hiroyuki

Search repository
権利
権利情報 © Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License.
抄録
内容記述 To clarify the biological processing of nitrate within temperate forested catchments using unprocessed atmospheric nitrate exported from each catchment as a tracer, we continuously monitored stream nitrate concentrations and stable isotopic compositions, including 17O excess (Δ17O), in three forested catchments in Japan (KJ, IJ1, and IJ2) for more than 2 years. The catchments showed varying flux-weighted average nitrate concentrations of 58.4, 24.4, and 17.1µmol L^−1 in KJ, IJ1, and IJ2, respectively, which correspond to varying export fluxes of nitrate: 76.4, 50.1, and 35.1mmolm^−2 in KJ, IJ1, and IJ2, respectively. In addition to stream nitrate, nitrate concentrations and stable isotopic compositions in soil water were determined for comparison in the most nitrate-enriched catchment (site KJ). While the 17O excess of nitrate in soil water showed significant seasonal variation, ranging from +0.1‰ to +5.7‰ in KJ, stream nitrate showed small variation, from +0.8‰ to +2.0‰ in KJ, +0.7‰ to +2.8‰ in IJ1, and +0.4‰ to +2.2‰ in IJ2. We conclude that the major source of stream nitrate in each forested catchment is groundwater nitrate. Additionally, the significant seasonal variation found in soil nitrate is buffered by the groundwater nitrate. The estimated annual export flux of unprocessed atmospheric nitrate accounted for 9.4 % ± 2.6%, 6.5 % ± 1.8%, and 2.6 % ± 0.6% of the annual deposition flux of atmospheric nitrate in KJ, IJ1, and IJ2, respectively. The export flux of unprocessed atmospheric nitrate relative to the deposition flux showed a clear normal correlation with the flux-weighted average concentration of stream nitrate, indicating that reductions in the biological assimilation rates of nitrate in forested soils, rather than increased nitrification rates, are likely responsible for the elevated stream nitrate concentration, probably as a result of nitrogen saturation. The export flux of unprocessed atmospheric nitrate relative to the deposition flux in each forest ecosystem is applicable as an index for nitrogen saturation.
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.
内容記述タイプ Other
出版者
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
DOI
関連識別子
識別子タイプ DOI
関連識別子 https://doi.org/10.5194/bg-15-7025-2018
ISSN(print)
収録物識別子タイプ ISSN
収録物識別子 1726-4189
書誌情報 Biogeosciences

巻 15, 号 22, p. 7025-7042, 発行日 2018-11-22
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