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森林土壌呼吸CO_2の^<14>C同位体比変動モデル(第20回名古屋大学年代測定総合研究センターシンポジウム平成19(2007)年度報告)
https://doi.org/10.18999/sumrua.19.46
https://doi.org/10.18999/sumrua.19.46ac8eb341-a7df-4420-b296-f17b425aa419
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
KJ00005462206.pdf (369.4 kB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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| 公開日 | 2010-06-11 | |||||
| タイトル | ||||||
| タイトル | 森林土壌呼吸CO_2の^<14>C同位体比変動モデル(第20回名古屋大学年代測定総合研究センターシンポジウム平成19(2007)年度報告) | |||||
| 言語 | ja | |||||
| その他のタイトル | ||||||
| その他のタイトル | Model of Variation in Carbon Isotopic Ratio of CO_2 from Forest Floor(Proceedings of the 20^<th> Symposium on Chronological Studies at the Nagoya University Center for Chronological Research in 2007) | |||||
| 言語 | en | |||||
| 著者 |
河合, 伸太郎
× 河合, 伸太郎× KAWAI, Shintaro× 森泉, 純× MORIIZUMI, Jun× 山澤, 弘実× YAMAZAWA, Hiromi× 飯田, 孝夫× IIDA, Takao |
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| アクセス権 | ||||||
| アクセス権 | open access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
| 権利 | ||||||
| 言語 | ja | |||||
| 権利情報 | 名古屋大学年代測定資料研究センター | |||||
| 権利 | ||||||
| 言語 | ja | |||||
| 権利情報 | 本文データは学協会の許諾に基づきCiNiiから複製したものである | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Forest is a large reservoir of carbon, and is both the CO_2 release source and absorption sink. The forest in high latitude areas in the northern hemisphere is thought to be an important release source and absorption sink of CO_2 that contributes to the earth's carbon cycle. It has been therefore required to quantitatively estimate the ability of a forest of releasing or absorbing CO_2. Moreover, it is necessary to evaluate carbon cycle in the environment for the radiological dose evaluation from ^<14>C released from nuclear reactors and fuel reprocessing plants. In the present study, the soil CO_2 efflux and its carbon isotopic ratio were measured in a forest. Soil temperature and the depth profile of the soil organic matter contents were also measured. The transportation of CO_2 in soil layer was calculated with measured CO_2 production rates to analyze the variation in carbon isotopic ratio in CO_2 emitted from the forest floor. We selected a pine forest as an observation site (Inabu, Toyota, Aichi Pref, 35°12'N, 137°24'E) where the altitude is 1010 m above sea level, simulating a boreal forest. Mean tree height was 23 m, and mean tree age was about 40 y. The observation was performed from May 2004 to November 2006. The soil CO_2 flux, defined as the mass of CO_2 released from unit area of soil surface per unit time, was measured at ten spots with a closed-chamber method. Non-dispersive infrared ray absorption gas analyzer (LI-820, Li-Cor) was used for CO_2 concentration analysis. Soil respired CO_2 was collected with a chamber of 144 L volume, then its carbon isotopic ratio was analyzed with Tandetron AMS and an isotopic ratio mass spectrometer (Finnigan MAT 252, Thermo Electron). Soil cores (0〜30cm) were sampled and depth profile of CO_2 production rates were measured in laboratory. The soil temperature, soil water and CO_2 concentration dependency of the CO_2 production rate were measured and modeled as a function of soil temperature, soil water and CO_2 concentration. The numerical analysis using one-dimensional soil CO_2 transport model was carried out for each carbon isotopic CO_2. The modeled CO_2 production rate was adapted to the numerical analysis to calculate forest floor CO_2 efflux and its carbon isotopic ratio. The soil CO_2 flux increased with increasing soil temperature. The radiocarbon isotopic ratio (δ^<14>C) of the soil respired CO_2 showed seasonal and diurnal variations, that it tends to have large values in high-temperature periods. It is well known that soil organic matter (SOM) has large δ^<14>C value at the top soil layer, which was affected by atomic-bomb test in 1950s and early 60s. Thus change in the depth profile of CO_2 production rate, which was caused by the change in the soil temperature, is thought as a cause of δ^<14>C variation in soil-respired CO_2. The results of numerical analysis suggested that δ^<14>C in soil respired CO_2 increased in the high-temperature period, of which tendency was generally agreed with the measurement result. Therefore, it can be concluded that the change in the depth profile of CO_2 production rate causes the change in the carbon isotopic ratio in soil respired CO_2. | |||||
| 言語 | en | |||||
| 内容記述 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 第20回名古屋大学年代測定総合研究センターシンポジウム平成19(2007)年度報告<第2部> Proceedings of the 20th symposiumon on Chronological Studies at the Nagoya University Center for Chronological Research in 2007 日時:平成20 (2008)年1月10日(木)～11日(金) 会場:名古屋大学野依記念学術交流館 Date:January10th-11th, 2008 Venue:Nagoya Uhiversity Noyori Conference Hall | |||||
| 言語 | ja | |||||
| 出版者 | ||||||
| 出版者 | 名古屋大学年代測定資料研究センター | |||||
| 言語 | ja | |||||
| 言語 | ||||||
| 言語 | jpn | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | departmental bulletin paper | |||||
| 出版タイプ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
| ID登録 | ||||||
| ID登録 | 10.18999/sumrua.19.46 | |||||
| ID登録タイプ | JaLC | |||||
| 関連情報 | ||||||
| 関連タイプ | isVersionOf | |||||
| 識別子タイプ | URI | |||||
| 関連識別子 | http://ci.nii.ac.jp/naid/110007151050/ | |||||
| 書誌情報 |
ja : 名古屋大学加速器質量分析計業績報告書 巻 19, p. 46-50, 発行日 2008-03 |
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| フォーマット | ||||||
| 値 | application/pdf | |||||
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| 値 | publisher | |||||
