VasseurPotvin1998

Référence

Vasseur, L., Potvin, C. (1998) Natural pasture community response to enriched carbon dioxide atmosphere. Plant Ecology, 135(1):31-41.

Résumé

We examined the response of a pasture community in southern Quebec (Canada) to long-term exposure of enriched atmospheric CO2 conditions. The study was conducted using open-top growth chambers directly placed on top of the natural pasture community. To investigate the change in the overall species composition in time and space, we used canonical correspondence analysis, a direct ordination method. Over the three years, the overall community responded significantly to enriched CO2. The analyses show that, after three years, CO2 was the most important environmental variable affecting the species composition. Initially the presence of the wall of the chambers influenced the composition but CO2 became more important by the third year. Soil and air temperatures only slightly influenced the community composition. The first two axes of the canonical correspondence analysis explained a large proportion of the variation in the three years and these trends appeared to increase with time. Species such as Agropyron repens appeared to be positively influenced by the presence of the wall (slightly warmer conditions). However, the analyses suggest that Phleum pratense and Trifolium repens, for example, were favored by the increase in atmospheric CO2. The variation in species composition in enriched versus ambient CO2 chambers suggests that the effect of the environmental factors, particularly CO2, were important in affecting the rate and pattern of succession. Furthermore, the temporal increase in importance of the variable CO2 in the present analyses indicates that there might be a time-lag in response to atmospheric enrichment.

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@ARTICLE { VasseurPotvin1998,
    AUTHOR = { Vasseur, L. and Potvin, C. },
    TITLE = { Natural pasture community response to enriched carbon dioxide atmosphere },
    JOURNAL = { Plant Ecology },
    YEAR = { 1998 },
    VOLUME = { 135 },
    PAGES = { 31-41 },
    NUMBER = { 1 },
    NOTE = { 13850237 (ISSN) Cited By (since 1996): 12 Export Date: 26 April 2007 Source: Scopus CODEN: PLECF doi: 10.1023/A:1009753403246 Language of Original Document: English Correspondence Address: Vasseur, L.; Department of Biology; Saint-Mary's University Halifax, NS B3H 3C3, Canada References: Bazzaz, F.A., The response of natural ecosystems to the rising global CO2 levels (1990) Ann. Rev. Ecol. Syst., 21, pp. 167-196; Diaz, S., Elevated CO2 responsiveness, interactions at the community level and plant functional types (1995) J. Biogeogr., 22, pp. 289-295; Drake, B.G., Leadley, P.W., Canopy photosynthesis of crops and native plant communities exposed to long-term elevated CO2 (1991) Plant, Cell Environ., 14, pp. 853-860; Drake, B.G., Peresta, G., Beugeling, E., Matamala, R., Long-term CO2 exposure in a Chesapeake Bay Wetland: Ecosystem gas exchange, primary production and tissue nitrogen (1996) Carbon Dioxide and Terrestrial Ecosystems, pp. 197-214. , Koch, G. W. and H. A. 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    ABSTRACT = { We examined the response of a pasture community in southern Quebec (Canada) to long-term exposure of enriched atmospheric CO2 conditions. The study was conducted using open-top growth chambers directly placed on top of the natural pasture community. To investigate the change in the overall species composition in time and space, we used canonical correspondence analysis, a direct ordination method. Over the three years, the overall community responded significantly to enriched CO2. The analyses show that, after three years, CO2 was the most important environmental variable affecting the species composition. Initially the presence of the wall of the chambers influenced the composition but CO2 became more important by the third year. Soil and air temperatures only slightly influenced the community composition. The first two axes of the canonical correspondence analysis explained a large proportion of the variation in the three years and these trends appeared to increase with time. Species such as Agropyron repens appeared to be positively influenced by the presence of the wall (slightly warmer conditions). However, the analyses suggest that Phleum pratense and Trifolium repens, for example, were favored by the increase in atmospheric CO2. The variation in species composition in enriched versus ambient CO2 chambers suggests that the effect of the environmental factors, particularly CO2, were important in affecting the rate and pattern of succession. Furthermore, the temporal increase in importance of the variable CO2 in the present analyses indicates that there might be a time-lag in response to atmospheric enrichment. },
    KEYWORDS = { Canonical correspondence analysis CO2 Multivariate analysis Open-top chambers Plant community Succession carbon dioxide enrichment community response pasture Canada, Quebec Agropyron repens Phleum pratense Trifolium repens },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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