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

R. B. Jackson, Y. Luo, Z. G. Cardon, O. E. Sala, C. B. Field, H. A. Mooney

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


Avena barbata in the field showed little evidence of photosynthetic downregulation with elevated CO2 at the end of the growing season (differences between treatments <10%). Glasshouse studies also showed little evidence for downregulation of photosynthesis measured at various light and intercellular CO2 concentrations. Although specific leaf mass (leaf mass per unit leaf area) for Avena increased 20% in the field with elevated CO2, leaf nitrogen concentrations decreased 25%, resulting in an 11% reduction in leaf N on a leaf-area basis. For the relatively wet 1993 growing season, A. barbata increased its size and reproduction c30% in elevated CO2, with a 21% decrease in population density. For the relatively dry 1994 season density was almost doubled in elevated CO2, but increases in individual size and reproduction with CO2 were small (6-18%). The primary effect of CO2 in the drier year appears to have been greater Avena survival, rather than increased individual size. -from Authors

Original languageEnglish (US)
Pages (from-to)221-225
Number of pages5
JournalJournal of Biogeography
Issue number2-3
StatePublished - 1995
Externally publishedYes

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology


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