Flowering phenology in a species-rich temperate grassland is sensitive to warming but not elevated CO2 |
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Authors: | Hovenden Mark J Wills Karen E Vander Schoor Jacqueline K Williams Amity L Newton Paul C D |
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Institution: | School of Plant Science, University of Tasmania, Hobart, Tasmania, Australia;;Land &Environmental Management, AgResearch, Palmerston North, New Zealand |
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Abstract: | * 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, the impact of elevated atmospheric CO2 concentration (CO2]) (550 micromol mol(-1)) and warming (+2 masculineC) is reported 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 three out of 23 species. Warming reduced time to first flowering by an average of 19.1 d 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; neither 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. |
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Keywords: | climate change elevated CO2 flowering free-air CO2 enrichment (FACE) global warming grassland phenology |
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