Biotic validation of small open-top chambers in a tundra ecosystem

被引:171
作者
Hollister, RD [1 ]
Webber, PJ [1 ]
机构
[1] Michigan State Univ, Dept Bot & Plant Pathol, E Lansing, MI 48824 USA
关键词
arctic tundra; chamber; climate change; ITEX; plant response; warming;
D O I
10.1046/j.1365-2486.2000.00363.x
中图分类号
X176 [生物多样性保护];
学科分类号
090705 ;
摘要
Small open-top chambers (OTC) are used widely in ecosystem warming experiments. The efficacy of the open-top chamber as an analogue of climatic warming is examined. Twenty-four small OTCs were used to passively warm canopy temperatures in wet meadow tundra at Barrow, Alaska, during two consecutive summers with contrasting surface air-temperatures. Fortuitously, the seasonal average temperature regime within chambers in the colder year (1995) was similar to the controls of the warmer year (1996); this allowed a comparison of natural vs. chamber warming. All measured plant responses behaved similarly to both year and treatment 68% of the time. A comparison of the populations of the warmer summer's control with the cooler summer's OTC found no statistical difference in 80% of the response variables measured. A meta-analysis also found no significant difference between the responses of the two populations. These results give empirical biotic validation for the use of the OTC as an analogue of regional climate warming.
引用
收藏
页码:835 / 842
页数:8
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