Seedling tree responses to nutrient stress under atmospheric CO/sub 2/ enrichment. [Quercus alba; Liriodendron tulipifera; Pinus virginiana]
Three species of seedling trees were grown in pots containing low-nutrient soil for periods of up to 40 weeks under a range of atmospheric CO/sub 2/ concentrations. In all cases, total dry weight increased with CO/sub 2/ enrichment, with a greater relative increase in root weight than shoot weight. In an experiment with Pinus virginiana in open-top field chambers, phosphorus and potassium uptake did not increase with an increase in CO/sub 2/ from 365 to 690 ..mu..L/L, even though dry matter gain increased by 37% during the exposure period. In experiments with Quercus alba and Liriodendron tulipifera under controlled environment conditions there were obvious symptoms of nitrogen deficiency and total nitrogen uptake did not increase with CO/sub 2/ enrichment. However, dry weight gain was more than 90% higher at 690 ..mu..L/L CO/sub 2/. The three experiments with CO/sub 2/ enrichment treatments demonstrate that increases in plant dry weight can occur without increased uptake of some nutrients from the low-nutrient soil. A mechanism for these responses may involve increased mobilization of nutrients in association with increased sucrose transport under elevated CO/sub 2/ conditions.
- Research Organization:
- Oak Ridge National Lab., TN (USA). Environmental Sciences Div.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5387861
- Report Number(s):
- CONF-860949-1; ON: DE86008243
- Resource Relation:
- Conference: 18. IUFRO world congress, Ljubljana, Yugoslavia, 8 Sep 1986
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CARBON DIOXIDE
BIOLOGICAL EFFECTS
TREES
PLANT GROWTH
EXPERIMENTAL DATA
NITROGEN
NUTRIENTS
PHOSPHORUS
POTASSIUM
UPTAKE
ALKALI METALS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
DATA
ELEMENTS
GROWTH
INFORMATION
METALS
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PLANTS
560303* - Chemicals Metabolism & Toxicology- Plants- (-1987)