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  Partitioning the net CO2 flux of a deciduous forest into respiration and assimilation using stable carbon isotopes

Knohl, A., & Buchmann, N. (2005). Partitioning the net CO2 flux of a deciduous forest into respiration and assimilation using stable carbon isotopes. Global Biogeochemical Cycles, 19(4), GB4008. doi:10.1029/2004GB002301.

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BGC0850.pdf (Publisher version), 477KB
 
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 Creators:
Knohl, A.1, Author           
Buchmann, N.2, Author           
Affiliations:
1Department Biogeochemical Processes, Prof. E.-D. Schulze, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497751              
2Research Group Biodiversity Ecosystem, Dr. N. Buchmann, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497759              

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Free keywords: Soil respiration Ecosystem respiration Stomatal conductance Fagus-sylvatica Gas-exchange Phloem sap Terrestrial vegetation Nicotiana-sylvestris Tree photosynthesis (CO2)-c-12 emission
 Abstract: Partitioning net ecosystem CO2 fluxes measured by the eddy covariance technique into their components assimilation and respiration is crucial for predicting future responses and feedbacks of ecosystems to a changing climate. On the basis of an isotopic approach with C-13, we partitioned the daytime net CO2 fluxes of a deciduous forest in central Germany into assimilation and respiration fluxes over a period of 3 weeks. This is the first attempt so far to quantify component fluxes with stable isotopes over the period of 3 weeks, enabling us to investigate the impact of environmental factors on the partitioned fluxes. Large variability in environmental conditions during the 3-week measurement campaign led to strong changes in isotopic disequilibrium between assimilation and respiration, ranging from 1 to 5%. Although this approach is still associated with large uncertainty, we found reasonable patterns in ecosystem respiration and assimilation, and a significant correlation of daytime respiration with soil temperature (R-2 = 0.48). The ratio of respiration to assimilation was highly variable on a day-to-day basis, ranging from 10% to more than 25%. This ratio was mainly controlled by soil temperature (R-2 = 0.61), indicating a strong sensitivity of ecosystem carbon dynamics to temperature changes and higher carbon uptake efficiency during cooler days. [References: 62]

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 Dates: 2005
 Publication Status: Issued
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 Identifiers: DOI: 10.1029/2004GB002301
Other: BGC0850
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Title: Global Biogeochemical Cycles
Source Genre: Journal
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Publ. Info: Washington, DC : American Geophysical Union
Pages: - Volume / Issue: 19 (4) Sequence Number: - Start / End Page: GB4008 Identifier: CoNE: https://pure.mpg.de/cone/journals/resource/954925553383
ISSN: 0886-6236