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Effect of elevated CO[sub 2] on photosynthetic plasticity to growth light conditions in tree species of contrasting shade tolerance

Conference · · Bulletin of the Ecological Society of America; (United States)
OSTI ID:7016323
;  [1]
  1. Michigan State Univ., East Lansing, MI (United States)
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The purpose of this study was to test the hypothesis that elevated atmospheric CO[sub 2] will induce a shift in photosynthetic light response (A/Q) that varies directly with species' intrinsic shade tolerance. Light saturated A (A[sub sat]) was highest under elevated CO[sub 2] (714 ppm) in sun plants of Betula papyrifera (intolerant) and Quercus rubra (intermediate) and in shade plants of Acer rubrum (tolerant). Acer exhibited the greatest CO[sub 2]-induced shift in A/Q plasticity to growth light conditions, including leaf absorbtivity, light compensation point ([Gamma]) and quantum yield ([phi]). Shade plants of Betula exhibited no shift in A/Q with elevated CO[sub 2] whereas Quercus and Acer had lower [Gamma] and higher A[sub sat]. [phi] increased with CO[sub 2] in shade plants of Acer and sun plants of Quercus. These results suggest that changes in carbon balance of understory seedlings may differentially shift with increasing CO[sub 2] depending upon species plasticity to sun versus shade conditions.

OSTI ID:
7016323
Report Number(s):
CONF-940894--
Journal Information:
Bulletin of the Ecological Society of America; (United States), Journal Name: Bulletin of the Ecological Society of America; (United States) Vol. 75:2; ISSN BECLAG; ISSN 0012-9623
Country of Publication:
United States
Language:
English

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Related Subjects

560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOLOGICAL ADAPTATION
BIOLOGICAL EFFECTS
BIRCHES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
ECOLOGICAL CONCENTRATION
MAGNOLIOPHYTA
MAGNOLIOPSIDA
MAPLES
OAKS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANTS
RADIATIONS
SOLAR RADIATION
STELLAR RADIATION
SYNTHESIS
TOLERANCE
TREES