期刊
JOURNAL OF ECOLOGY
卷 98, 期 5, 页码 1035-1041出版社
WILEY
DOI: 10.1111/j.1365-2745.2010.01690.x
关键词
climate change; experimental warming; International Tundra Experiment; open-top chamber; passive warming; resistance; tundra; vegetation change
资金
- Natural Sciences and Engineering Resource Council (NSERC) of Canada
- Northern Scientific Training Program, ArcticNet
- Government of Canada International Polar Year program
P>1. Identifying plant communities that are resistant to climate change will be critical for developing accurate, wide-scale vegetation change predictions. Most northern plant communities, especially tundra, have shown strong responses to experimental and observed warming. 2. Experimental warming is a key tool for understanding vegetation responses to climate change. We used open-top chambers to passively warm an evergreen-shrub heath by 1.0-1.3 degrees C for 15 years at Alexandra Fiord, Nunavut, Canada (79 degrees N). In 1996, 2000 and 2007, we measured height, plant composition and abundance with a point-intercept method. 3. Experimental warming did not strongly affect vascular plant cover, canopy height or species diversity, but it did increase bryophyte cover by 6.3% and decrease lichen cover by 3.5%. Temporal changes in plant cover were more frequent and of greater magnitude than changes due to experimental warming. 4. Synthesis. This evergreen-shrub heath continues to exhibit community-level resistance to long-term experimental warming, in contrast to most Arctic plant communities. Our findings support the view that only substantial climatic changes will alter unproductive ecosystems.
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