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Informing climate models with rapid chamber measurements of forest carbon uptake
Lunds universitet.
Oak Ridge National Laboratory.
Duke University.
Sveriges Lanbruksuniversitet.
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2016 (English)In: Global Change Biology, ISSN 1354-1013, E-ISSN 1365-2486Article in journal (Refereed) In press
Abstract [en]

Models predicting ecosystem carbon dioxide (CO2) exchange under future climate change rely on relatively few real-world tests of their assumptions and outputs. Here, we demonstrate a rapid and cost-effective method to estimateCO2exchange from intact vegetation patches under varying atmospheric CO2concentrations.We find that net ecosys-tem CO2uptake (NEE) in a boreal forest rose linearly by 4.7  0.2% of the current ambient rate for every 10 ppmCO2increase, with no detectable influence of foliar biomass, season, or nitrogen (N) fertilization. The lack of any clearshort-term NEE response to fertilization in such an N-limited system is inconsistent with the instantaneous downreg-ulation of photosynthesis formalized in many global models. Incorporating an alternative mechanism with consider-able empirical support – diversion of excess carbon to storage compounds – into an existing earth system modelbrings the model output into closer agreement with our field measurements. A global simulation incorporating thismodified model reduces a long-standing mismatch between the modeled and observed seasonal amplitude of atmo-spheric CO2. Wider application of this chamber approach would provide critical data needed to further improvemodeled projections of biosphere–atmosphere CO2exchange in a changing climate.

Place, publisher, year, edition, pages
2016.
Keyword [en]
boreal forest, earth system model, model-data integration, nutrient limitation, photosynthetic downregulation, Pinussylvestris
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:umu:diva-131516DOI: 10.1111/gcb.13451OAI: oai:DiVA.org:umu-131516DiVA: diva2:1074736
Available from: 2017-02-16 Created: 2017-02-16 Last updated: 2017-03-13

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf