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Comparing root water uptake profile estimations from an isotope-calibrated mechanistic model and a mixing model
http://hdl.handle.net/2241/00149388
http://hdl.handle.net/2241/001493882029f306-cd66-47d4-923c-10e9ac0ffc25
名前 / ファイル | ライセンス | アクション |
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HRL_11-3 (1.1 MB)
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Item type | Journal Article(1) | |||||
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公開日 | 2017-12-21 | |||||
タイトル | ||||||
タイトル | Comparing root water uptake profile estimations from an isotope-calibrated mechanistic model and a mixing model | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
著者 |
Yamanaka, Tsutomu
× Yamanaka, Tsutomu× Kimura, Takeo× Sun, Xinchao× Kato, Hiroaki× Onda, Yuichi |
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著者別名 |
山中, 勤
× 山中, 勤× 加藤, 弘亮× 恩田, 裕一 |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | The root water uptake profile (RWUP) reflects a plant’s survival strategy and controls evapotranspiration and carbon fluxes. Despite its importance, there is still no reliable method for reconstructing this profile. In this study, we applied and compared two possible approaches to a case study in a conifer plantation: an isotope-calibrated mechanistic model and a mixing model with a bell-shaped approximation. Our results show that, after calibrating the hydrologically-active root density profile, the mechanistic model gave a good estimation of the xylem water isotope delta (δx); even though the measured root density was greater in shallower soils, water uptake occurred throughout the entire soil profile, with more uptake in deeper soils. The RWUPs estimated by the mixing model were different from those estimated by the mechanistic model and were unrealistic. However, when we constrained the minimum thickness of the water uptake zone, there was good agreement between the RWUPs from the two approaches. We can therefore conclude that the mechanistic model calibrated with isotopes gave better results, and that sole use of the mixing model is not recommended unless appropriate constraints are applied. | |||||
書誌情報 |
Hydrological Research Letters 巻 11, 号 3, p. 161-167, 発行日 2017-09 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 1882-3416 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | 10.3178/hrl.11.161 | |||||
権利 | ||||||
権利情報 | © The Author(s) 2017. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/ licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. | |||||
著者版フラグ | ||||||
値 | publisher | |||||
出版者 | ||||||
出版者 | Japan Society of Hydrology and Water Resources |