Short-term effects of CO/sub 2/ on gas exchange of leaves of bigtooth aspen (Populus grandidentata) in the field

Journal Article · Wed Aug 01 04:00:00 EDT 1984 · Plant Physiol.; (United States)

OSTI ID:6053405

Jurik, T W; Weber, J A; Gates, D M

The short term effects of increased levels of CO/sub 2/ on gas exchange of leaves of bigtooth aspen (Populus grandidentata Michx.) were studied at the University of Michigan Biological Station, Pellston, MI. Leaf gas exchange was measured in situ in the upper half of the canopy, 12 to 14 meters above ground. In 1900 microliters per liter CO/sub 2/, maximum CO/sub 2/ exchange rate (CER) in saturating light was increased by 151% relative to CER in 320 microliters per liter CO/sub 2/. The temperature optimum for CER shifted from 25/sup 0/C in 320 microliters per liter CO/sub 2/ to 37/sup 0/C in 1900 microliters per liter CO/sub 2/. In saturating light, increasing CO/sub 2/ level over the range 60 to 1900 microliters per liter increased CER, decreased stomatal conductance, and increased leaf water use efficiency. The initial slope of the CO/sub 2/ response curve of CER was not significantly different at 20 and 30/sup 0/C leaf temperatures, although the slope did decline significantly during leaf senescence. In 1900 microliters per liter CO/sub 2/, CER increased with increasing light. The light saturation point and maximum CER were higher in 30/sup 0/C than in 20/sup 0/C, although there was little effect of temperature in low light. The experimental results are consistent with patterns seen in laboratory studies of other C/sub 3/ species and define the parameters required by some models of aspen CER in the field. 25 references, 5 figures.

• Research Organization: Univ. of Michigan Biological Station, Ann Arbor
• DOE Contract Number: AC02-79EV10091
• OSTI ID: 6053405
• Journal Information: Plant Physiol.; (United States), Journal Name: Plant Physiol.; (United States) Vol. 75:4; ISSN PLPHA
• Country of Publication: United States
• Language: English

Related Subjects

560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AIR POLLUTION
ASPENS
BIOLOGICAL EFFECTS
BIOLOGICAL INDICATORS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
INTERLABORATORY COMPARISONS
LEAVES
MASS TRANSFER
MONITORING
OPENINGS
OXIDES
OXYGEN COMPOUNDS
PLANTS
POLLUTION
STOMATA
TEMPERATURE EFFECTS
TREES