Field response of photosynthesis to CO/sub 2/ enhancement in ponderosa pine. [Pinus ponderosa]

Journal Article · Sat Jan 01 04:00:00 EST 1977 · Ecology; (United States)

OSTI ID:6427412

Green, K; Wright, R

Net photosynthesis was determined by CO/sub 2/ analysis for Pinus ponderosa Laws. in situ in the San Bernardino Mountains of southern California. Leafy shoots were maintained in cuvettes under ambient and enhanced levels of CO/sub 2/ on successive days. Carbon dioxide enhancement was up to 150 ppm above ambient levels. Mean response of net photosynthesis increased 84%. Responsiveness to CO/sub 2/ enhancement was not altered by high temperature or decreasing soil water potential during the months June-October. The added CO/sub 2/ compensated for reduction of 50% in light intensity. Severe damage from oxidant air pollution reduced but did not eliminate the response to CO/sub 2/ enhancement. The evidence suggests that net photosynthesis will increase in linear relation to rising atmospheric CO/sub 2/ during the next few decades. 22 references, 1 figure, 5 tables.

• Research Organization: Univ. of Redlands, CA
• OSTI ID: 6427412
• Journal Information: Ecology; (United States), Journal Name: Ecology; (United States) Vol. 58:3; ISSN ECOLA
• 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.
AMBIENT TEMPERATURE
ATMOSPHERIC PRECIPITATIONS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
CONIFERS
DATA
ECOLOGICAL CONCENTRATION
ELECTROMAGNETIC RADIATION
EXPERIMENTAL DATA
INFORMATION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOCHEMISTRY
PHOTOSYNTHESIS
PINES
PLANTS
QUANTITY RATIO
RADIATIONS
SMOG
SOILS
SYNTHESIS
TREES
VISIBLE RADIATION