2018年
Seabird-affected taluses are denitrification hotspots and potential N<inf>2</inf>O emitters in the High Arctic
Scientific Reports
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- 巻
- 8
- 号
- 1
- 開始ページ
- 17261
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1038/s41598-018-35669-w
- 出版者・発行元
- Springer Science and Business Media {LLC}
In High Arctic tundra ecosystems, seabird colonies create nitrogen cycling hotspots because of bird-derived labile organic matter. However, knowledge about the nitrogen cycle in such ornithocoprophilous tundra is limited. Here, we determined denitrification potentials and in-situ nitrous oxide (N2O) emissions of surface soils on plant-covered taluses under piscivorous seabird cliffs at two sites (BL and ST) near Ny-Alesund, Svalbard, in the European High Arctic. Talus soils at both locations had very high denitrification potentials at 10 degrees C (2.62-4.88 mg N kg(-1) dry soil h(-1)), near the mean daily maximum air temperature in July in Ny-Alesund, with positive temperature responses at 20 degrees C (Q10 values, 1.6-2.3). The talus soils contained abundant denitrification genes, suggesting that they are denitrification hotspots. However, high in-situ N2O emissions, indicating the presence of both active aerobic nitrification and anaerobic denitrification, were observed only at BL (max. 16.6 mu g N m(-2) h(-1)). Rapid nitrogen turnover at BL was supported by lower carbon-to-nitrogen ratios, higher nitrate content, and higher delta N-15 values in the soils at BL compared with those at ST. These are attributed to the 30-fold larger seabird density at BL than at ST, providing the larger organic matter input.
- リンク情報
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- DOI
- https://doi.org/10.1038/s41598-018-35669-w
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000450911800032&DestApp=WOS_CPL
- URL
- http://www.scopus.com/inward/record.url?eid=2-s2.0-85057107632&partnerID=MN8TOARS
- ID情報
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- DOI : 10.1038/s41598-018-35669-w
- ISSN : 2045-2322
- ORCIDのPut Code : 92873073
- SCOPUS ID : 85057107632
- Web of Science ID : WOS:000450911800032