Acid deposition interactions with a regenerating southern Appalachian forest canopy at the Coweeta Hydrologic Laboratory
Thesis/Dissertation
·
OSTI ID:7188965
Incident precipitation, throughfall, and stemflow were collected during twenty storm events to examine the importance of factors potentially determining net canopy fluxes, and to quantify canopy exchange and dry deposition rates in a regenerating southern Appalachian forest. Net throughfall fluxes showed consistent canopy effects on rainfall chemistry, with SO/sub 4//sup 2 -/, PO/sub 4//sup 3 -/, Cl/sup -/, K/sup +/, Ca/sup 2 +/, and Mg/sup 2 +/ added to rainfall by foliage, and absorption of NO/sub 3//sup -/-N, and H/sup +/ ions from precipitation. Storm characteristics accounted for the largest portion of the variability in growing seasons net throughfall fluxes, suggesting that canopy exchange was the major mechanism of throughfall transfer. Stemflow fluxes increased canopy exchange rates of SO/sub 4//sup 2 -/, PO/sub 4//sup 3 -/, Cl/sup -/, K/sup +/, and Mg/sup 2 +/ by greater than 20% when added to net throughfall fluxes in a regression model of total below-canopy element fluxes. Cation leaching fluxes were highly variable over small spatial scales but could be explained largely by heterogeneity in canopy cover and hydrogen ion uptake from precipitation.
- Research Organization:
- Emory Univ., Atlanta, GA (USA)
- OSTI ID:
- 7188965
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
560300 -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ACID RAIN
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ANIONS
APPALACHIAN MOUNTAINS
ATMOSPHERIC PRECIPITATIONS
CALCIUM COMPOUNDS
CANOPIES
CATIONS
CHARGED PARTICLES
CHLORIDES
CHLORINE COMPOUNDS
DISASTERS
DISSOLUTION
ENVIRONMENTAL EFFECTS
FORESTS
HALIDES
HALOGEN COMPOUNDS
IONS
LEACHING
MAGNESIUM COMPOUNDS
MATHEMATICAL MODELS
MOUNTAINS
NITRATES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
POTASSIUM COMPOUNDS
PRECIPITATION SCAVENGING
RAIN
SEPARATION PROCESSES
STORMS
SULFATES
SULFUR COMPOUNDS
THROUGHFALL
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
560300 -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ACID RAIN
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ANIONS
APPALACHIAN MOUNTAINS
ATMOSPHERIC PRECIPITATIONS
CALCIUM COMPOUNDS
CANOPIES
CATIONS
CHARGED PARTICLES
CHLORIDES
CHLORINE COMPOUNDS
DISASTERS
DISSOLUTION
ENVIRONMENTAL EFFECTS
FORESTS
HALIDES
HALOGEN COMPOUNDS
IONS
LEACHING
MAGNESIUM COMPOUNDS
MATHEMATICAL MODELS
MOUNTAINS
NITRATES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
POTASSIUM COMPOUNDS
PRECIPITATION SCAVENGING
RAIN
SEPARATION PROCESSES
STORMS
SULFATES
SULFUR COMPOUNDS
THROUGHFALL