Impacts of elevated atmospheric CO2 and O3 on Paper Birch (Betula papyrifera): reproductive fitness
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The Scientific World Journal. 7(S1): 240-246.
Atmospheric CO2 and tropospheric O3 are rising in many regions of the world. Little is known about how these two commonly co-occurring gases will affect reproductive fitness of important forest tree species. Here, we report on the long-term effects of CO2 and O3 for paper birch seedlings exposed for nearly their entire life history at the Aspen FACE (Free Air Carbon Dioxide Enrichment) site in Rhinelander, WI. Elevated CO2 increased both male and female flower production, while elevated O3 increased female flower production compared to trees in control rings. Interestingly, very little flowering has yet occurred in combined treatment.
Darbah, Joseph N.T.; Kubiske, Mark E.; Nelson, Neil; Oksanen, Elina; Vaapavuori, Elina; Karnosky, David F. 2007. Impacts of elevated atmospheric CO2 and O3 on Paper Birch (Betula papyrifera): reproductive fitness. The Scientific World Journal. 7(S1): 240-246.