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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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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-000E-D7C2-0 Version Permalink: https://hdl.handle.net/21.11116/0000-000A-4651-C
Genre: Journal Article

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BGC1231.pdf (Publisher version), 575KB
 
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BGC1231s1.zip (Supplementary material), 43KB
 
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http://dx.doi.org/10.1029/2008GB003233 (Publisher version)
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 Creators:
Beer, C.1, Author           
Ciais, P., Author
Reichstein, M.1, Author           
Baldocchi, D., Author
Law, B. E., Author
Papale, D., Author
Soussana, J. F., Author
Ammann, C., Author
Buchmann, N., Author
Frank, D.1, Author           
Gianelle, D., Author
Janssens, I. A., Author
Knohl, A., Author
Kostner, B., Author
Moors, E., Author
Roupsard, O., Author
Verbeeck, H., Author
Vesala, T., Author
Williams, C. A., Author
Wohlfahrt, G., Author
Affiliations:
1Research Group Biogeochemical Model-data Integration, Dr. M. Reichstein, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497760              

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 Abstract: 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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 Dates: 2009
 Publication Status: Issued
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 Identifiers: DOI: 10.1029/2008GB003233
Other: BGC1231
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Title: Global Biogeochemical Cycles
  Other : Glob. Biogeochem. Cycle
Source Genre: Journal
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Publ. Info: Washington, DC : American Geophysical Union
Pages: - Volume / Issue: 23 (2) Sequence Number: - Start / End Page: GB2018 Identifier: ISSN: 0886-6236
CoNE: https://pure.mpg.de/cone/journals/resource/954925553383