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Henni Ylänne. Foto.

Henni Ylänne

Forskare

Henni Ylänne. Foto.

Consequences of warming on tundra carbon balance determined by reindeer grazing history

Författare

  • Maria Väisänen
  • Henni Ylänne
  • Elina Kaarlejärvi
  • Sofie Sjögersten
  • Johan Olofsson
  • Neil Crout
  • Sari Stark

Summary, in English

Arctic tundra currently stores half of the global soil carbon (C) stock. Climate warming in the Arctic may lead to accelerated CO 2 release through enhanced decomposition and turn Arctic ecosystems from a net C sink into a net C source, if warming enhances decomposition more than plant photosynthesis. A large portion of the circumpolar Arctic is grazed by reindeer/caribou, and grazing causes important vegetation shifts in the long-term. Using a unique experimental set-up, where areas experiencing more than 50 years of either light (LG) or heavy (HG) grazing were warmed and/or fertilized, we show that under ambient conditions areas under LG were a 70% stronger C sink than HG areas. Although warming decreased the C sink by 38% under LG, it had no effect under HG. Grazing history will thus be an important determinant in the response of ecosystem C balance to climate warming, which at present is not taken into account in climate change models.

Publiceringsår

2014-05

Språk

Engelska

Sidor

384-388

Publikation/Tidskrift/Serie

Nature Climate Change

Volym

4

Issue

5

Dokumenttyp

Artikel i tidskrift

Förlag

Nature Publishing Group

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1758-678X