Responses of mature loblolly pine trees to elevated CO[sub 2] concentrations
- Univ. of Georgia, Athens (United States)
The direct responses of mature loblolly pine (Pinus taeda) foliage to increasing atmospheric CO[sub 2] were investigated in six 18-year-old loblolly pine trees using the branch-chamber technique. On each tree, six main branches were randomly selected and each enclosed in one of six chambers. Each branch received one of the following six treatments: ambient CO[sub 2]/ambient temperature (1), 1.5 x ambient CO[sub 2] ambient temperature (2), 2.0 x ambient CO[sub 2]/ambient temperature (3), ambient CO[sub 2]/2.0[degrees]C + ambient temperature (4), 1.5 x ambient CO[sub 2]/2.0[degree]C + ambient temperature (5) and 2.0 x ambient CO[sub 2]/2.0[degree]C + ambient temperature (6). A/C, curves were run and P- (photosynthetic rate at saturating light) of the current year, first flush needles was measured at each respective treatment CO[sub 2] level for treatments 1, 2 and 3 using the Li-cor 6200 photosynthesis system. Both elevated CO[sub 2] concentrations significantly increased the photosynthesis of the foliage of the mature loblolly pine trees. However, comparison of the slopes of the initial linear part of the A/C[sub 1], curves suggested no reduction in the rubisco carboxylation activity. Additionally, there was no indication of photosynthetic acclimation to elevated CO[sub 2].
- OSTI ID:
- 6396655
- 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
Similar Records
Elevated CO{sub 2} in a prototype free-air CO{sub 2} enrichment facility affects photosynthetic nitrogen relations in a maturing pine forest
Does free-air carbon dioxide enrichment affect photochemical energy use by evergreen trees in different seasons? A chlorophyll fluorescence study of mature loblolly pine
Related Subjects
CARBON DIOXIDE
BIOLOGICAL EFFECTS
PINES
PHOTOSYNTHESIS
CARBOXYLATION
EXPOSURE CHAMBERS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CONIFERS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PINOPHYTA
PLANTS
SYNTHESIS
TREES
560300* - Chemicals Metabolism & Toxicology