CO2 fertilization in temperate FACE experiments not representative of boreal and tropical forests

Thomas Hickler*, Benjamin Smith, I. Colin Prentice, Kristina Mjöfors, Paul Miller, Almut Arneth, Martin T. Sykes

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

216 Citations (Scopus)

Abstract

Results from free-air CO2 enrichment (FACE) experiments in temperate climates indicate that the response of forest net primary productivity (NPP) to elevated CO2 might be highly conserved across a broad range of productivities. In this study, we show that the LPJ-GUESS dynamic vegetation model reproduces the magnitude of the NPP enhancement at temperate forest FACE experiments. A global application of the model suggests that the response found in the experiments might also be representative of the average response of forests globally. However, the predicted NPP enhancement in tropical forests is more than twice as high as in boreal forests, suggesting that currently available FACE results are not applicable to these ecosystems. The modeled geographic pattern is to a large extent driven by the temperature dependence of the relative affinities of the primary assimilation enzyme (Rubisco) for CO2 and O2.

Original languageEnglish
Pages (from-to)1531-1542
Number of pages12
JournalGlobal Change Biology
Volume14
Issue number7
DOIs
Publication statusPublished - Jul 2008
Externally publishedYes

Keywords

  • Carbon cycle
  • Climate change
  • CO fertilization
  • Ecosystem model
  • FACE
  • Forest response
  • LPJ-GUESS
  • NPP
  • Photosynthesis
  • Rubisco

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