Watershed base-cation cycle dynamics modeled over forest regrowth in a central Appalachian ecosystem

Watershed inputs and outputs, and intra-system cycling of calcium, potassium and magnesium in Shaver Hollow watershed in Shenandoah National Park are reported. Tree foliage, branches and roots in 2 sets of samples taken from up to 11 plots were collected in 1990, dried and analysed. Tree cores were...

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Bibliographic Details
Published in:Water, air, and soil pollution air, and soil pollution, 1996-01, Vol.89 (1/2), p.1-22
Main Authors: Currie, W.S, Galloway, J.N, Shugart, H.H
Format: Article
Language:English
Subjects:
biogeochemical cycles
biogeochemistry
calcium
canopy
deciduous forests
Earth sciences
Earth, ocean, space
Exact sciences and technology
forest soils
Geochemistry
leaching
magnesium
Marine and continental quaternary
mathematical models
mineralization
mineralogy
natural regeneration
nutrient uptake
potassium
Quercus montana
Quercus rubra
secondary forests
simulation models
Soil and rock geochemistry
Surficial geology
watersheds
weathering
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Summary:Watershed inputs and outputs, and intra-system cycling of calcium, potassium and magnesium in Shaver Hollow watershed in Shenandoah National Park are reported. Tree foliage, branches and roots in 2 sets of samples taken from up to 11 plots were collected in 1990, dried and analysed. Tree cores were sampled in 1991, litter in 1990 and throughfall in 1988. A forest dynamics model (FORWAS) is described. Flux calculations and model parameterization are discussed. Estimated geologic fluxes were compared with modelled biotic fluxes. Large biotic fluxes indicated the contribution of biomass to ecosystem nutrient cycling. Mineralization from forest floor biomass was an important source of internal recycling during aggradation. Accumulation of base cations in biomass correlated with soil acid production and was 3 times greater than atmospheric deposition levels. Base cation removal rates could exceed weathering rates leading to depletion of base cations from soil. There are 59 references.
ISSN:0049-6979
1573-2932
DOI:10.1007/BF00300418