Cloudwater and O[sub 3] effects on red spruce at Whitetop Mt. , VA: Physiological response
Results of studies on red spruce (Picea rubens Sarg.) at Whitetop Mountain (elevation 1689 m) were assessed to evaluate whether acidic cloudwater deposition and O[sub 3] contribute to reported high elevation red spruce ecosystem decline. Studies were conducted using seedling exclusion chambers, mature tree branch exclusion chambers, and field experiments with seedlings, saplings, and mature trees. Ozone had minimal effects on the measured parameters. Photosynthetic response to cloudwater varied, dependent on tree age. Seedling respiration tended to decrease with cloudwater removal, although biomass accumulation was not affected. A 3[degrees] to 5[degrees]C increase in cold tolerance was measured in seedlings with cloudwater excluded. Chlorophyll and epicuticular wax concentrations were not significantly affected. Physiological responses to cloudwater may be caused by the observed depletion of needle cations, particularly Ca, which appear to be due to foliar leaching and to increased soil Al concentrations, which can interfere with cation uptake by roots.
- OSTI ID:
- 7161949
- 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
54 ENVIRONMENTAL SCIENCES
ACID RAIN
BIOLOGICAL EFFECTS
ECOLOGICAL CONCENTRATION
CLOUDS
CHEMISTRY
OZONE
SPRUCES
BIOCHEMISTRY
ALUMINIUM
CALCIUM
PHOTOSYNTHESIS
SOILS
ALKALINE EARTH METALS
ATMOSPHERIC PRECIPITATIONS
CHEMICAL REACTIONS
CONIFERS
ELEMENTS
METALS
PHOTOCHEMICAL REACTIONS
PINOPHYTA
PLANTS
RAIN
SYNTHESIS
TREES
560300* - Chemicals Metabolism & Toxicology
540120 - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)