Effects of Pleistocene, pre-industrial, current, and future CO[sub 2] partial pressures on C[sub 3] and C[sub 4] plant growth
- Duke Univ., Durham, NC (United States)
To study plant growth in atmospheric CO[sub 2] concentrations ranging from Pleistocene through predicted future levels, Amaranthus retroflexus (C[sub 4]) and Abutilon theophrasti (C[sub 3]) were grown in growth chambers at four CO[sub 2] levels (15 Pa, Pleistocene minimum; 27 Pa, pre-industrial; 35 Pa, current; 70 Pa, future). Thirty-five days after emergence, shoot dry weight, root dry weight and leaf area did not differ between any CO[sub 2] levels for the C[sub 4] species. The C[sub 3] species showed increased root and shoot dry weights and leaf areas when grown in CO[sub 2] partial pressures of 15 Pa, 27 Pa and 35 Pa. This evidence indicates that plant growth in C[sub 4] species is unaffected by atmospheric CO[sub 2] levels ranging from the Pleistocene minimum through the future; whereas, C[sub 3] species show growth increases as CO[sub 2] partial pressures rise above the Pleistocene minimum.
- OSTI ID:
- 6201891
- Report Number(s):
- CONF-930798-; CODEN: BECLAG
- Journal Information:
- Bulletin of the Ecological Society of America; (United States), Vol. 74:2; Conference: 78. annual Ecological Society of America (ESA) meeting, Madison, WI (United States), 31 Jul - 4 Aug 1993; ISSN 0012-9623
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
CARBON DIOXIDE
BIOLOGICAL EFFECTS
PLANT GROWTH
VARIATIONS
C4 SPECIES
CLIMATIC CHANGE
FORECASTING
PALEOCLIMATOLOGY
PLEISTOCENE EPOCH
CARBON COMPOUNDS
CARBON OXIDES
CENOZOIC ERA
CHALCOGENIDES
GEOLOGIC AGES
GROWTH
OXIDES
OXYGEN COMPOUNDS
PALEONTOLOGY
PLANTS
QUATERNARY PERIOD
560300* - Chemicals Metabolism & Toxicology
540100 - Environment
Atmospheric- (1990-)