Get access
Advertisement

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

Authors

  • THOMAS HICKLER,

    1. Department of Physical Geography and Ecosystems Analysis, Geobiosphere Science Centre, Lund University, Sölvegatan 12, S-223 62 Lund, Sweden,
    Search for more papers by this author
  • BENJAMIN SMITH,

    1. Department of Physical Geography and Ecosystems Analysis, Geobiosphere Science Centre, Lund University, Sölvegatan 12, S-223 62 Lund, Sweden,
    Search for more papers by this author
  • I. COLIN PRENTICE,

    1. Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Clifton, Bristol BS8 1RJ, UK
    Search for more papers by this author
  • KRISTINA MJÖFORS,

    1. Department of Physical Geography and Ecosystems Analysis, Geobiosphere Science Centre, Lund University, Sölvegatan 12, S-223 62 Lund, Sweden,
    Search for more papers by this author
    • 1Present address: Kristina Mjöfors, Department of Forest Soils, Swedish University of Agricultural Science, PO Box 7001, S-750 07 Uppsala, Sweden.

  • PAUL MILLER,

    1. Department of Physical Geography and Ecosystems Analysis, Geobiosphere Science Centre, Lund University, Sölvegatan 12, S-223 62 Lund, Sweden,
    Search for more papers by this author
  • ALMUT ARNETH,

    1. Department of Physical Geography and Ecosystems Analysis, Geobiosphere Science Centre, Lund University, Sölvegatan 12, S-223 62 Lund, Sweden,
    Search for more papers by this author
  • MARTIN T. SYKES

    1. Department of Physical Geography and Ecosystems Analysis, Geobiosphere Science Centre, Lund University, Sölvegatan 12, S-223 62 Lund, Sweden,
    Search for more papers by this author

Thomas Hickler, e-mail: Thomas.hickler@natekolu.se

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.

Get access to the full text of this article

Ancillary