Global negative vegetation feedback to climate warming responses of leaf litter decomposition rates in cold biomes

Johannes H.C. Cornelissen, Peter M. Van Bodegom, Rien Aerts, Terry V. Callaghan, Richard S.P. Van Logtestijn, Juha Alatalo, F. Stuart Chapin, Renato Gerdol, Jon Gudmundsson, Dylan Gwynn-Jones, Anne E. Hartley, David S. Hik, Annika Hofgaard, Ingibjörg S. Jónsdóttir, Staffan Karlsson, Julia A. Klein, Jim Laundre, Borgthor Magnusson, Anders Michelsen, Ulf MolauVladimir G. Onipchenko, Helen M. Quested, Sylvi M. Sandvik, Inger K. Schmidt, Gus R. Shaver, Bjørn Solheim, Nadejda A. Soudzilovskaia, Anna Stenström, Anne Tolvanen, Ørjan Totland, Naoya Wada, Jeffrey M. Welker, Xinquan Zhao, Lisa Brancaleoni, Laura Brancaleoni, Miranda A.H. De Beus, Elisabeth J. Cooper, Linda Dalen, John Harte, Sarah E. Hobbie, Gerlof Hoefsloot, Annika Jägerbrand, Sven Jonasson, John A. Lee, Karin Lindblad, Jerry M. Melillo, Christopher Neill, Malcolm C. Press, Jelte Rozema, Matthias Zielke

Research output: Contribution to journalArticlepeer-review

299 Scopus citations

Abstract

Whether climate change will turn cold biomes from large long-term carbon sinks into sources is hotly debated because of the great potential for ecosystem-mediated feedbacks to global climate. Critical are the direction, magnitude and generality of climate responses of plant litter decomposition. Here, we present the first quantitative analysis of the major climate-change-related drivers of litter decomposition rates in cold northern biomes worldwide. Leaf litters collected from the predominant species in 33 global change manipulation experiments in circum-arctic-alpine ecosystems were incubated simultaneously in two contrasting arctic life zones. We demonstrate that longer-term, large-scale changes to leaf litter decomposition will be driven primarily by both direct warming effects and concomitant shifts in plant growth form composition, with a much smaller role for changes in litter quality within species. Specifically, the ongoing warming-induced expansion of shrubs with recalcitrant leaf litter across cold biomes would constitute a negative feedback to global warming. Depending on the strength of other (previously reported) positive feedbacks of shrub expansion on soil carbon turnover, this may partly counteract direct warming enhancement of litter decomposition.

Original languageEnglish (US)
Pages (from-to)619-627
Number of pages9
JournalEcology letters
Volume10
Issue number7
DOIs
StatePublished - Jul 1 2007

Keywords

  • Alpine
  • Carbon
  • Circum-arctic
  • Global change
  • Growth form
  • Litter turnover
  • Mass loss
  • Vegetation change

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