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

Artikel i vetenskaplig tidskrift
Författare Sara C. Elmendorf
Gregory H.R. Henry
Robert D. Hollister
Robert G. Björk
Anne D. Bjorkman
Terry V. Callaghan
Laura Siegwart Collier
Elisabeth J. Cooper
Johannes H.C. Cornelissen
Thomas A. Day
Anna Maria Fosaa
William A. Gould
Jarngerur Gretarsdottir
John Harte
Luise Hermanutz
David S. Hik
Annika Hofgaard
Frith Jarrad
Ingibjörg Svala Jonsdottir
Frida Keuper
Kari Klanderud
Julia A. Klein
Saewan Koh
Gaku Kudo
Simone I. Lang
Val Loewen
Jeremy L. May
Joel Mercado
Anders Michelsen
Ulf Molau
Isla H. Myers-Smith
Steven F. Oberbauer
Sara Pieper
Eric Post
Christian Rixen
Clare H. Robinson
Niels Martin Schmidt
Gaius R. Shaver
Anna Stenström
Anne Tolvanen
Ørjan Totland
Tiffany Troxler
Carl-Henrik Wahren
Patrick J. Webber
Jeffery M. Welker
Philip A. Wookey
Publicerad i Ecology Letters
Volym 15
Nummer/häfte 2
Sidor 164-175
ISSN 1461-0248
Publiceringsår 2012
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 164-175
Språk en
Länkar dx.doi.org/10.1111/j.1461-0248.2011...
Ämnesord Alpine, Arctic, climate warming, long-term experiment, meta-analysis, plants
Ämneskategorier Terrestrisk ekologi, Biologiska vetenskaper

Sammanfattning

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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