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.
journal_name
Ecol Lettjournal_title
Ecology lettersauthors
Elmendorf SC,Henry GH,Hollister RD,Björk RG,Bjorkman AD,Callaghan TV,Collier LS,Cooper EJ,Cornelissen JH,Day TA,Fosaa AM,Gould WA,Grétarsdóttir J,Harte J,Hermanutz L,Hik DS,Hofgaard A,Jarrad F,Jónsdóttir IS,Keuper Fdoi
10.1111/j.1461-0248.2011.01716.xsubject
Has Abstractpub_date
2012-02-01 00:00:00pages
164-75issue
2eissn
1461-023Xissn
1461-0248journal_volume
15pub_type
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