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  Temporal and among-site variability of inherent water use efficiency at the ecosystem level

Beer, C., Ciais, P., Reichstein, M., Baldocchi, D., Law, B. E., Papale, D., et al. (2009). Temporal and among-site variability of inherent water use efficiency at the ecosystem level. Global Biogeochemical Cycles, 23(2), GB2018. doi:10.1029/2008GB003233.

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http://dx.doi.org/10.1029/2008GB003233 (Verlagsversion)
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 Urheber:
Beer, C.1, Autor           
Ciais, P., Autor
Reichstein, M.1, Autor           
Baldocchi, D., Autor
Law, B. E., Autor
Papale, D., Autor
Soussana, J. F., Autor
Ammann, C., Autor
Buchmann, N., Autor
Frank, D.1, Autor           
Gianelle, D., Autor
Janssens, I. A., Autor
Knohl, A., Autor
Kostner, B., Autor
Moors, E., Autor
Roupsard, O., Autor
Verbeeck, H., Autor
Vesala, T., Autor
Williams, C. A., Autor
Wohlfahrt, G., Autor
Affiliations:
1Research Group Biogeochemical Model-data Integration, Dr. M. Reichstein, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497760              

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 Zusammenfassung: Half-hourly measurements of the net exchanges of carbon dioxide and water vapor between terrestrial ecosystems and the atmosphere provide estimates of gross primary production (GPP) and evapotranspiration (ET) at the ecosystem level and on daily to annual timescales. The ratio of these quantities represents ecosystem water use efficiency. Its multiplication with mean daylight vapor pressure deficit (VPD) leads to a quantity which we call "inherent water use efficiency" (IWUE*). The dependence of IWUE* on environmental conditions indicates possible adaptive adjustment of ecosystem physiology in response to a changing environment. IWUE* is analyzed for 43 sites across a range of plant functional types and climatic conditions. IWUE* increases during short-term moderate drought conditions. Mean annual IWUE* varied by a factor of 3 among all sites. This is partly explained by soil moisture at field capacity, particularly in deciduous broad-leaved forests. Canopy light interception sets the upper limits to canopy photosynthesis, and explains half the variance in annual IWUE* among herbaceous ecosystems and evergreen needle-leaved forests. Knowledge of IWUE* offers valuable improvement to the representation of carbon and water coupling in ecosystem process models. [References: 79]

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 Datum: 2009
 Publikationsstatus: Erschienen
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 Identifikatoren: DOI: 10.1029/2008GB003233
Anderer: BGC1231
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Titel: Global Biogeochemical Cycles
  Andere : Glob. Biogeochem. Cycle
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Washington, DC : American Geophysical Union
Seiten: - Band / Heft: 23 (2) Artikelnummer: - Start- / Endseite: GB2018 Identifikator: ISSN: 0886-6236
CoNE: https://pure.mpg.de/cone/journals/resource/954925553383