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Flowering phenology in a species-rich temperate grassland is sensitive to warming but not elevated CO2
Hovenden, MJ and Wills, KE and Vander Schoor, JK and Williams, AL and Newton, PCD (2008) Flowering phenology in a species-rich temperate grassland is sensitive to warming but not elevated CO2. New Phytologist, 178 (4). pp. 815-822. ISSN 0028-646X
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Flowering is a critical stage in plant life cycles, and changes might alter processes at the species, community and ecosystem levels. Therefore likely flowering-time responses to global change drivers are needed for predictions of global change impacts on natural and managed ecosystems. Here we report the impact of elevated [CO2] (550 mol mol-1) and warming (+2ºC) on flowering times in a native, species-rich, temperate grassland in Tasmania, Australia in both 2004 and 2005. Elevated [CO2] did not affect average time of first flowering in either year, only affecting 3 out of 23 species. Warming reduced time to first flowering by an average of 19.1 days in 2004, acting on most species, but did not significantly alter flowering time in 2005, which might be related to the timing of rainfall. Elevated [CO2] and warming treatments did not interact on flowering time. These results show elevated [CO2] did not alter average flowering time or duration in this grassland, nor did it alter the response to warming. Therefore, flowering phenology appears insensitive to increasing [CO2] in this ecosystem although the response to warming varies between years but can be strong.
|Keywords:||FACE, elevated CO2, climate change, global warming, grassland, flowering, phenology.|
|Journal or Publication Title:||New Phytologist|
|Page Range:||pp. 815-822|
|Identification Number - DOI:||10.1111/j.1469-8137.2008.02419.x|
|Additional Information:||The definitive version is available at www.blackwell-synergy.com|
|Date Deposited:||02 Apr 2008 02:09|
|Last Modified:||30 Sep 2008 00:42|
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