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Title: Nitrate is an important nitrogen source for Arctic tundra plants
Authors: Liu, Xue-Yan
Koba, Keisuke  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0003-1942-9811 (unconfirmed)
Koyama, Lina A.
Hobbie, Sarah E.
Weiss, Marissa S.
Inagaki, Yoshiyuki
Shaver, Gaius R.
Giblin, Anne E.
Hobara, Satoru
Nadelhoffer, Knute J.
Sommerkorn, Martin
Rastetter, Edward B.
Kling, George W.
Laundre, James A.
Yano, Yuriko
Makabe, Akiko
Yano, Midori
Liu, Cong-Qiang
Author's alias: 木庭, 啓介
小山, 里奈
稲垣, 善之
保原, 達
眞壁, 明子
矢野, 翠
Keywords: Arctic tundra plants
nitrogen dynamics
plant nitrate
soil nitrate
stable isotopes
Issue Date: 27-Mar-2018
Publisher: National Academy of Sciences
Journal title: Proceedings of the National Academy of Sciences of the United States of America
Volume: 115
Issue: 13
Start page: 3398
End page: 3403
Abstract: Plant nitrogen (N) use is a key component of the N cycle in terrestrial ecosystems. The supply of N to plants affects community species composition and ecosystem processes such as photosynthesis and carbon (C) accumulation. However, the availabilities and relative importance of different N forms to plants are not well understood. While nitrate (NO3−) is a major N form used by plants worldwide, it is discounted as a N source for Arctic tundra plants because of extremely low NO3− concentrations in Arctic tundra soils, undetectable soil nitrification, and plant-tissue NO3− that is typically below detection limits. Here we reexamine NO3− use by tundra plants using a sensitive denitrifier method to analyze plant-tissue NO3−. Soil-derived NO3− was detected in tundra plant tissues, and tundra plants took up soil NO3− at comparable rates to plants from relatively NO3−-rich ecosystems in other biomes. Nitrate assimilation determined by 15N enrichments of leaf NO3− relative to soil NO3− accounted for 4 to 52% (as estimated by a Bayesian isotope-mixing model) of species-specific total leaf N of Alaskan tundra plants. Our finding that in situ soil NO3− availability for tundra plants is high has important implications for Arctic ecosystems, not only in determining species compositions, but also in determining the loss of N from soils via leaching and denitrification. Plant N uptake and soil N losses can strongly influence C uptake and accumulation in tundra soils. Accordingly, this evidence of NO3− availability in tundra soils is crucial for predicting C storage in tundra.
Description: ツンドラの生態系でも硝酸イオンは大切な窒素源だった --最先端の測定技術で「見えない」硝酸イオンの重要性を検証--. 京都大学プレスリリース. 2018-03-14.
Rights: This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND).
URI: http://hdl.handle.net/2433/230345
DOI(Published Version): 10.1073/pnas.1715382115
PubMed ID: 29540568
Related Link: https://www.kyoto-u.ac.jp/ja/research-news/2018-03-14
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