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The magnitude of average CH4 exchange differed depending on wind direction, reflecting spatial variation in soil moisture condition around the observation tower, due to elevation change within the small catchment. In the drier upper position, the seasonal variation in CH4 emission was explained by the variation in soil water content only. In the wetter bottom, however, in addition to soil temperature and soil water content, seasonal thaw depth of frozen soil was also an important variable explaining the seasonal variation in CH4 exchange for this ecosystem. Total snow-free season (day of year 134-280) CH4 exchanges were 12.0 +/- 1.0, 19.6 +/- 3.0, and 36.6 +/- 4.4 mmol m(-2) season(-1) for the drier upper position, moderately wet area, and wetter bottom of the catchment, respectively. Observed total season CH4 emission was nearly one order smaller than those reported in other northern wetlands, due probably to the relatively low ground water level and low soil temperature. The interannual variation of total snow-free season CH4 emission in the wetter bottom of the catchment was influenced by the amount of rainfall and thaw depth. On the other hand, in the drier upper position the amount of rainfall did not strongly affect the total season CH4 emission. Different responses of CH4 exchange to environmental conditions, depending on the position of a small catchment, should be considered when estimating the spatial variation in CH4 exchange accurately in ecosystems over permafrost. (C) 2015 Elsevier B.V. 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Methane exchange in a poorly-drained black spruce forest over permafrost observed using the eddy covariance technique
http://hdl.handle.net/10091/00018704
http://hdl.handle.net/10091/00018704b6543dcf-b5d3-4acd-9c72-dda1bc896211
名前 / ファイル | ライセンス | アクション |
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Methane_exchange_in_a_poorly-drained_black.pdf (2.1 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2016-03-23 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Methane exchange in a poorly-drained black spruce forest over permafrost observed using the eddy covariance technique | |||||
言語 | ||||||
言語 | eng | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1016/j.agrformet.2015.08.252 | |||||
関連名称 | 10.1016/j.agrformet.2015.08.252 | |||||
キーワード | ||||||
主題 | Boreal forest, CH4 flux, Path analysis, Spatial variability, Thaw depth | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
著者 |
Iwata, Hiroki
× Iwata, Hiroki× Harazono, Yoshinobu× Ueyama, Masahito× Sakabe, Ayaka× Nagano, Hirohiko× Kosugi, Yoshiko× Takahashi, Kenshi× Kim, Yongwon |
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信州大学研究者総覧へのリンク | ||||||
氏名 | Iwata, Hiroki | |||||
URL | http://soar-rd.shinshu-u.ac.jp/profile/ja.WCAaPafh.html | |||||
出版者 | ||||||
出版者 | ELSEVIER SCIENCE BV | |||||
引用 | ||||||
内容記述タイプ | Other | |||||
内容記述 | AGRICULTURAL AND FOREST METEOROLOGY. 214(0):157-168 (2015) | |||||
書誌情報 |
AGRICULTURAL AND FOREST METEOROLOGY 巻 214, p. 157-168, 発行日 2015-12-15 |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Ecosystem-scale methane (CH4) exchange was observed in a poorly-drained black spruce forest over permafrost in interior Alaska during the snow-free seasons of 2011–2013, using the eddy covariance technique. The magnitude of average CH4 exchange differed depending on wind direction, reflecting spatial variation in soil moisture condition around the observation tower, due to elevation change within the small catchment. In the drier upper position, the seasonal variation in CH4 emission was explained by the variation in soil water content only. In the wetter bottom, however, in addition to soil temperature and soil water content, seasonal thaw depth of frozen soil was also an important variable explaining the seasonal variation in CH4 exchange for this ecosystem. Total snow-free season (day of year 134–280) CH4 exchanges were 12.0 ± 1.0, 19.6 ± 3.0, and 36.6 ± 4.4 mmol m−2 season−1 for the drier upper position, moderately wet area, and wetter bottom of the catchment, respectively. Observed total season CH4 emission was nearly one order smaller than those reported in other northern wetlands, due probably to the relatively low ground water level and low soil temperature. The interannual variation of total snow-free season CH4 emission in the wetter bottom of the catchment was influenced by the amount of rainfall and thaw depth. On the other hand, in the drier upper position the amount of rainfall did not strongly affect the total season CH4 emission. Different responses of CH4 exchange to environmental conditions, depending on the position of a small catchment, should be considered when estimating the spatial variation in CH4 exchange accurately in ecosystems over permafrost. | |||||
資源タイプ(コンテンツの種類) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Article | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0168-1923 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA10499788 | |||||
権利 | ||||||
権利情報 | © 2015. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | |||||
出版タイプ | ||||||
出版タイプ | AM | |||||
出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||
WoS | ||||||
表示名 | Web of Science | |||||
URL | http://gateway.isiknowledge.com/gateway/Gateway.cgi?&GWVersion=2&SrcAuth=ShinshuUniv&SrcApp=ShinshuUniv&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000364730000015 |