Long term effects of elevated CO sub 2 on photosynthesis and dark respiration of C3 and C4 salt marsh species in the field. [Scirpus olneyi; Spartina patens]
- Smithsonian Environmental Research Center, Edgewater, MD (USA)
Mono specific stands of the C3 sedge, Scirpus olneyi, and the C4 grass, Spartina patens, were exposed to normal ambient or elevated CO2 (normal ambient + 340 ul/l) in open top chambers throughout two growing seasons. Photosynthesis in the C3 sedge measured in elevated CO2 or low O2 (air with 1% O2) was greater at all light levels than photosynthesis measured in normal ambient CO2. Plants grown in ambient or ambient + 340 ul/l CO2 showed an identical photosynthetic response when tested at elevated CO2 with no evidence of acclimation to elevated CO2. No differences in the photosynthetic response to light were noted for the C4 species at any of the gas mixtures tested. However, nighttime dark respiration rates decreased in both the C3 and C4 species when grown in elevated CO2.
- OSTI ID:
- 6991562
- Journal Information:
- Plant Physiology, Supplement; (USA), Vol. 89:4; ISSN 0079-2241
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
C4 SPECIES
PHOTOSYNTHESIS
CALVIN CYCLE SPECIES
CARBON DIOXIDE
BIOLOGICAL EFFECTS
FIELD TESTS
GRASS
RESPIRATION
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
LILIOPSIDA
MAGNOLIOPHYTA
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PLANTS
SYNTHESIS
TESTING
560300* - Chemicals Metabolism & Toxicology
540120 - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)