Abstract
In long-term experiments (up to 2.5 vegetation periods) grass/clover-mixtures (1: 1) were exposed to 4 CO2 concentration levels (340, 450, 600 and 800 mm3-dm−3) in acrylic-miniglasshouses which were climatized according to the microclimate outside. At 600 mm3-dm−3, plant growth and production were enhanced by 20–40% compared to cultures at 340 mm3-dm−3. Only the seed weight of the clover species increased by max. 28% with elevated CO2 concentration levels. Without clippings, the clover species tended to be more enhanced by additional CO2. With clippings, the grass was more successful in competition. The C/N-, C/P-, C/Ca- and C/K-relationships were higher at elevated CO2 concentration levels. The CO2 net fixation of the whole canopy increased by 40%, when the CO2 concentration was raised from 340 to 600 mm3-dm−3. This enhancement decreased until the end of the third vegetation period to about 10%. The ecological consequences of these findings are discussed.
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© 1990 Kluwer Academic Publishers
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Overdieck, D. (1990). Direct Effects of Elevated CO2 Concentration Levels on Grass and Clover in ‘Model-Ecosystems’. In: Beukema, J.J., Wolff, W.J., Brouns, J.J.W.M. (eds) Expected Effects of Climatic Change on Marine Coastal Ecosystems. Developments in Hydrobiology, vol 57. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-2003-3_6
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DOI: https://doi.org/10.1007/978-94-009-2003-3_6
Publisher Name: Springer, Dordrecht
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