Morphological and physiological responses of loblolly pine (Pinus taeda L. ) seedlings to elevated carbox dioxide
- Tuskegee Univ., AL (United States)
Seedlings of loblolly pine were planted in June 1993 in the ground in open-top chambers and exposed to three levels of carbon dioxide (0, 150 and 300 [mu]mol mol[sup [minus]1] above ambient) in an experiment designed to last at least 2 years. Morphological measurements (plant height, stem diameter, number of branches and number of flushes) were made monthly, beginning at the measurements (plant height, stem diameter, number of branches and number of flushes) were made monthly, beginning at the time of planting. Gas exchange determinations were made monthly from July until November 1993 using the Li-Cor LI 6200 portable photosynthesis system. Stem diameter, plant height and the number of flushes were significantly greater at the highest CO[sub 2] treatment starting in July, August and October, respectively. There was no consistent effect of CO[sub 2] on the number of branches. In the first month of gas exchange measurements (July), CO[sub 2] enrichment had not significant effect on net photosynthetic rates, but led to decreased transpiration rates. In all succeeding months, net leaf photosynthetic rates increased regulation of the CO[sub 2] enrichment effect on photosynthesis.
- OSTI ID:
- 7162258
- Report Number(s):
- CONF-940894-; CODEN: BECLAG
- Journal Information:
- Bulletin of the Ecological Society of America; (United States), Vol. 75:2; Conference: Annual Ecological Society of America (ESA) meeting: science and public policy, Knoxville, TN (United States), 7-11 Aug 1994; ISSN 0012-9623
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CARBON DIOXIDE
BIOLOGICAL EFFECTS
ECOLOGICAL CONCENTRATION
PINES
PHOTOSYNTHESIS
PLANT GROWTH
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CONIFERS
GROWTH
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PINOPHYTA
PLANTS
SYNTHESIS
TREES
560300* - Chemicals Metabolism & Toxicology