Nutrient uptake and growth responses of Virginia pine to elevated atmospheric carbon dioxide. [Pisolithus tinctorius, Pinus virginiana Mill]
One-year-old Virgina pine (Pinus virginiana Mill.) seedlings with native or Pisolithus tinctorius mycorrhizal associations were grown in pots with soil low in organic matter and in cation exchange capacity and were exposed to one of five atmospheric CO/sub 2/ levels in the range of 340 to 940 ..mu..L/L in open-top field chambers. The mean dry weight of the seedlings increased from 4.4 to 11.0 g/plant during the 122-d exposure period. Significant increases in dry weight and uptake of N, Ca, Al, Fe, Zn, and Sr occurred with CO/sub 2/ enrichment. Greater chemical uptake was associated with greater root weight. Specific absorption rates for chemicals (uptake per gram of root per day) were generally not affected by CO/sub 2/ enrichment. The uptake of P and K was not increased with elevated CO/sub 2/, and these elements showed the greater nutrient-use efficiency (C gain per element uptake). The nutrient-use efficiency for N and Ca was not influenced by atmospheric CO/sub 2/ enrichment. Large increases in Zn uptake at high CO'' suggested an increase in rhizosphere acidification, which may have resulted from the release of protons from the roots, since it was estimated that cation uptake increasingly exceeded anion uptake with CO/sub 2/ enrichment. Potassium, P, and NO/sub 3//sup -/ concentrations in the pot leachate decreased with higher CO/sub 2/ levels, and a similar trend was found for Al and Mg. These results suggest that soil-plant systems may exhibit increased nutrient and chemical retention at elevated atmospheric CO/sub 2/.
- Research Organization:
- Oak Ridge National Lab., TN
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 7022388
- Journal Information:
- J. Environ. Qual.; (United States), Vol. 15:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CARBON DIOXIDE
BIOLOGICAL EFFECTS
NUTRIENTS
ROOT ABSORPTION
PINES
GROWTH
ACIDIFICATION
ALUMINIUM
ANIONS
CALCIUM
CATIONS
EXPERIMENTAL DATA
ION EXCHANGE
IRON
LEACHATES
MAGNESIUM
NITRATES
NITROGEN
ORGANIC MATTER
PHOSPHORUS
POTASSIUM
ROOTS
SEEDLINGS
SOILS
STRONTIUM
ZINC
ABSORPTION
ALKALI METALS
ALKALINE EARTH METALS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHARGED PARTICLES
CONIFERS
DATA
DISPERSIONS
ELEMENTS
INFORMATION
IONS
METALS
MIXTURES
NITROGEN COMPOUNDS
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PLANTS
SOLUTIONS
TRANSITION ELEMENTS
TREES
UPTAKE
560300* - Chemicals Metabolism & Toxicology