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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

Quantifying the effects of clear-cutting and strip-cutting on nitrate dynamics in a forested watershed using triple oxygen isotopes as tracers

http://hdl.handle.net/2237/21795
de725aaf-8b8d-4371-929a-415ca17220be
名前 / ファイル ライセンス アクション
bg-11-5411-2014.pdf bg-11-5411-2014.pdf (2.1 MB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2015-05-01
タイトル
タイトル Quantifying the effects of clear-cutting and strip-cutting on nitrate dynamics in a forested watershed using triple oxygen isotopes as tracers
著者 Tsunogai, U.

× Tsunogai, U.

WEKO 57711

Tsunogai, U.

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Komatsu, D. D.

× Komatsu, D. D.

WEKO 57712

Komatsu, D. D.

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Ohyama, T.

× Ohyama, T.

WEKO 57713

Ohyama, T.

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Suzuki, A.

× Suzuki, A.

WEKO 57714

Suzuki, A.

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Nakagawa, F.

× Nakagawa, F.

WEKO 57715

Nakagawa, F.

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Noguchi, I.

× Noguchi, I.

WEKO 57716

Noguchi, I.

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Takagi, K.

× Takagi, K.

WEKO 57717

Takagi, K.

Search repository
Nomura, M.

× Nomura, M.

WEKO 57718

Nomura, M.

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Fukuzawa, K.

× Fukuzawa, K.

WEKO 57719

Fukuzawa, K.

Search repository
Shibata, H.

× Shibata, H.

WEKO 57720

Shibata, H.

Search repository
抄録
内容記述 Temporal variations in the stable isotopic compositions of nitrate dissolved in stream water eluted from a cool–temperate forested watershed (8 ha) were measured to quantify the biogeochemical effects of clear-cutting of trees and subsequent strip-cutting of the understory vegetation, dwarf bamboo (Sasa senanensis), with special emphasis on changes in the fate of atmospheric nitrate that had been deposited onto the watershed based on Δ17O values of nitrate. A significant increase in stream nitrate concentration to 15 μmol L−1 in spring of 2004 was correlated with a significant increase in the Δ17O values of nitrate. Additionally, the high Δ17O values of +14.3‰ suggest that the direct drainage of atmospheric nitrate accounted for more than 50% of total nitrate exported from the forested watershed peaking in spring. Similar increases in both concentrations and Δ17O values were also found in spring of 2005. Conversely, low Δ17O values less than +1.5‰ were observed in other seasons, regardless of increases in stream nitrate concentration, indicating that the majority of nitrate exported from the forested watershed during seasons other than spring was remineralized nitrate: those retained in the forested ecosystem as either organic N or ammonium and then been converted to nitrate via microbial nitrification. When compared with the values prior to strip-cutting, the annual export of atmospheric nitrate and remineralized nitrate increased more than 16-fold and fourfold, respectively, in 2004, and more than 13-fold and fivefold, respectively, in 2005. The understory vegetation (Sasa) was particularly important to enhancing biological consumption of atmospheric nitrate.
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
ISSN
収録物識別子タイプ ISSN
収録物識別子 1726-4170
書誌情報 Biogeosciences

巻 11, p. 5411-5424, 発行日 2014-10
著者版フラグ
値 publisher
URI
識別子 http://dx.doi.org/10.5194/bg-11-5411-2014
識別子タイプ DOI
URI
識別子 http://hdl.handle.net/2237/21795
識別子タイプ HDL
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