Net throughfall chemistry and atmospheric deposition at two forests of different elevations
We are measuring atmospheric deposition and throughfall chemistry at two coniferous sites. The higher (1800m) site is a red spruce (Picea rubens) forest; the lower (300m) is a loblolly pine (Pinus taeda) forest. Summed net chemical fluxes in throughfall (calculated as throughfall depth X concentrations minus rain depth X concentrations) are compared for April through July. Net fluxes of SO/sub 4//sup 2-/, NO/sub 3//sup -/, Na/sup +/, and Cl/sup -/, in throughfall are greater at the spruce site. Net fluxes of K/sup +/ and NH/sub 4//sup +/ in throughfall are greater at the pine site. Net fluxes of Ca/sub 2//sup +/ and Mg/sub 2//sup +4/ are nearly equal. Air concentrations and surrogate surface fluxes are quite similar between sites, except for higher NO/sub 3//sup -/ particle flux at the spruce site. Greater net throughfall fluxes at the spruce site reflect both greater canopy surface area, and cloud deposition to this site. Greater net K/sup +/ flux at the pine site reflects canopy losses. Negative NH/sub 4//sup +/ flux indicates spruce canopy uptake.
- Research Organization:
- Oak Ridge National Lab., Oak Ridge, TN (US)
- OSTI ID:
- 5944501
- Report Number(s):
- CONF-870835-
- Journal Information:
- Bull. Ecol. Soc. Am.; (United States), Vol. 68:3; Conference: 72. annual meeting of the Ecological Society of America, Columbus, OH, USA, 9 Aug 1987
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
FORESTS
PLANT GROWTH
RAIN
FOLIAR UPTAKE
TREES
NUTRIENTS
CALCIUM
CANOPIES
CHEMICAL COMPOSITION
CHLORINE
DEPOSITION
MAGNESIUM
NITROGEN OXIDES
PINES
POLLUTANTS
POTASSIUM
SODIUM
SPRUCES
SULFATES
WATER CHEMISTRY
ALKALI METALS
ALKALINE EARTH METALS
ATMOSPHERIC PRECIPITATIONS
CHALCOGENIDES
CHEMISTRY
CONIFERS
ELEMENTS
GROWTH
HALOGENS
METALS
NITROGEN COMPOUNDS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PINOPHYTA
PLANTS
SULFUR COMPOUNDS
UPTAKE
140504* - Solar Energy Conversion- Biomass Production & Conversion- (-1989)
510200 - Environment
Terrestrial- Chemicals Monitoring & Transport- (-1989)