Effects of elevated CO[sub 2] and non-limiting nutrients on growth and photosynthesis of loblolly pine

Conference · Wed Jun 01 04:00:00 EDT 1994 · Bulletin of the Ecological Society of America; (United States)

OSTI ID:7264790

Tissue, D T; Thomas, R B; Strain, B R ^[1]

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1. Duke Univ., Durham, NC (United States)

The effect of long-term CO[sub 2] enrichment and non-limiting nutrients on growth and photosynthesis were studied on loblolly pine (Pinus taeda L.) seedlings grown in three atmospheric CO[sub 2] partial pressures (ambient, ambient + 15 Pa, and ambient + 30 Pa) for 18 months in the field. Total plant biomass increased 20% for plants grown at +15 Pa and 50% for plants grown at + 30 PA compared with plants grown at ambient CO[sub 2]. Relative growth rates were higher for elevated CO[sub 2] plants in the first 10 months of treatment, then similar thereafter. Plants grown at elevated CO[sub 2] were also taller, had greater photosynthetic leaf area, and more frequent leaf flushes. Net photosynthesis was higher for plants grown in elevated CO[sub 2] in all seasons, but this difference was much greater in spring and summer. Rubisco content, activity and activation state were unaffected by growth at elevated CO[sub 2] indicating no regulation of rubisco occurred at elevated CO[sub 2]. Results from this experiment and from a previous experiment (under limiting nutrient conditions) suggest that the magnitude of the growth and photosynthetic response to a future, high-CO[sub 2] environment will largely depend on soil fertility.

• OSTI ID: 7264790
• Report Number(s): CONF-940894--
• Conference Information: Journal Name: Bulletin of the Ecological Society of America; (United States) Journal Volume: 75:2
• Country of Publication: United States
• Language: English

Related Subjects

560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOLOGICAL EFFECTS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
CONIFERS
ECOLOGICAL CONCENTRATION
GROWTH
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PINES
PINOPHYTA
PLANT GROWTH
PLANTS
SOIL CHEMISTRY
SYNTHESIS
TREES