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Photosynthesis, growth, and density for the dominant species in a CO2-enriched grassland

Jackson, RB, Y Luo, Z Cardon, OE Sala, CB Field, HA Mooney
Journal of Biogeography
Journal Volume/Pages: 
22: 221-225

Although increased atmospheric CO2 frequently increases short-term photosynthetic rates, longer-term photosynthetic responses are more variable. Plant size, reproduction and ecosystem carbon gain are determined, in part, by such photosynthetic responses. Here we examine photosynthetic regulation for the dominant species in a grassland exposed to elevated CO2 and examine whether the observed photosynthetic responses contribute to changes in growth, reproduction and plant density in the same grassland. Avena barbata in the field showed little evidence of photosynthetic downregulation with elevated CO2 at the end of the growing season (differences between treatments

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