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Journal Articles Ecology Letters Year : 2011

Global assessment of experimental climate warming on tundra vegetation: heterogeneity over space and time

Sarah Elmendorf
  • Function : Author
Robert Hollister
  • Function : Author
Laura Siegwart Collier
  • Function : Author
Elisabeth Cooper
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William Gould
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Járngerður Grétarsdóttir
  • Function : Author
John Harte
  • Function : Author
David Hik
  • Function : Author
Frith Jarrad
  • Function : Author
Frida Keuper
Julia Klein
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Saewan Koh
  • Function : Author
Gaku Kudo
  • Function : Author
Simone Lang
  • Function : Author
Val Loewen
  • Function : Author
Jeremy May
  • Function : Author
Joel Mercado
  • Function : Author
Anders Michelsen
  • Function : Author
Ulf Molau
  • Function : Author
Isla Myers-Smith
  • Function : Author
Steven Oberbauer
  • Function : Author
Sara Pieper
  • Function : Author
Eric Post
  • Function : Author
Christian Rixen
  • Function : Author
Clare Robinson
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Niels Martin Schmidt
  • Function : Author
Gaius Shaver
  • Function : Author
Anna Stenström
  • Function : Author
Anne Tolvanen
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Ørjan Totland
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Tiffany Troxler
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Carl‐henrik Wahren
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Patrick Webber
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Jeffery Welker
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Philip Wookey
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Abstract

Ecology Letters (2011) Abstract Understanding the sensitivity of tundra vegetation to climate warming is critical to forecasting future biodiversity and vegetation feedbacks to climate. In situ warming experiments accelerate climate change on a small scale to forecast responses of local plant communities. Limitations of this approach include the apparent site‐specificity of results and uncertainty about the power of short‐term studies to anticipate longer term change. We address these issues with a synthesis of 61 experimental warming studies, of up to 20 years duration, in tundra sites worldwide. The response of plant groups to warming often differed with ambient summer temperature, soil moisture and experimental duration. Shrubs increased with warming only where ambient temperature was high, whereas graminoids increased primarily in the coldest study sites. Linear increases in effect size over time were frequently observed. There was little indication of saturating or accelerating effects, as would be predicted if negative or positive vegetation feedbacks were common. These results indicate that tundra vegetation exhibits strong regional variation in response to warming, and that in vulnerable regions, cumulative effects of long‐term warming on tundra vegetation – and associated ecosystem consequences – have the potential to be much greater than we have observed to date.

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hal-04553131 , version 1 (19-04-2024)

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Sarah Elmendorf, Gregory Henry, Robert Hollister, Robert Björk, Anne Bjorkman, et al.. Global assessment of experimental climate warming on tundra vegetation: heterogeneity over space and time. Ecology Letters, 2011, 15 (2), pp.164-175. ⟨10.1111/j.1461-0248.2011.01716.x⟩. ⟨hal-04553131⟩

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