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DOI: 10.1055/s-2006-924760
Georg Thieme Verlag Stuttgart KG · New York
Effects of Elevated Atmospheric CO2 and/or O3 on Intra- and Interspecific Competitive Ability of Aspen
Publication History
Received: February 28, 2006
Accepted: October 23, 2006
Publication Date:
19 January 2007 (online)
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Abstract
Three model communities of trembling aspen (monoculture, and mixed with either paper birch or sugar maple) were grown for seven years in elevated atmospheric CO2 and O3 using Free Air CO2 Enrichment (FACE) technology. We utilized trends in species' importance, calculated as an index of volume growth and survival, as indications of shifting community composition. For the pure aspen communities, different clones emerged as having the highest change in relative importance values depending on the pollutant exposure. In the control and elevated CO2 treatments, clone 42E was rapidly becoming the most successful clone while under elevated O3, clone 8 L emerged as the dominant clone. In fact, growth of clone 8 L was greater in the elevated O3 treatment compared to controls. For the mixed aspen-birch community, importance of aspen and birch changed by - 16 % and + 62 %, respectively, in the controls. In the treatments, however, importance of aspen and birch changed by - 27 % and + 87 %, respectively, in elevated O3, and by - 10 % and + 45 %, respectively, in elevated CO2. Thus, the presence of elevated O3 hastened conversion of stands to paper birch, whereas the presence of elevated CO2 delayed it. Relative importance of aspen and maple changed by - 2 % and + 3 %, respectively, after seven years in the control treatments. But in elevated O3, relative importance of aspen and maple changed by - 2 % and + 5 %, respectively, and in elevated CO2 by + 9 and - 20 %, respectively. Thus, elevated O3 slightly increases the rate of conversion of aspen stands to sugar maple, but maple is placed at a competitive disadvantage to aspen under elevated CO2.
Key words
Sugar maple (Acer saccharum) - paper birch (Betula papyrifera) - trembling aspen (Populus tremuloides) - global change - growth.
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M. E. Kubiske
USDA Forest Service
Forestry Sciences Laboratory
5985 Hwy. K
Rhinelander, WI 54501
USA
Email: mkubiske@fs.fed.us
Guest Editor: R. Matyssek