Atmospheric Deposition and Ionic Concentrations in Forest Soils of Isle Royale National Park, Michigan
- Robert Stottlemyer and
- David G. Hanson
A 64-wk study of throughfall and soil solution was conducted on five ecosystem strata in Isle Royale National Park, MI, to examine the fate of atmospheric ionic inputs in mature boreal conifer and hardwood forests. Volume-weighted pH of bulk precipitation was 4.65. Weighted bulk throughfall pH was 4.6 under spruce [Picea glauca (Muench) A. Voss] and 5.2 under aspen (Populus tremuloides Michaux)-birch (Betula papyrifera Marsh). The forest canopy significantly increased the concentrations of Ca2+, Mg2+, and K+ in throughfall, and decreased the concentration in H+ beneath aspenbirch. Relative to precipitation, concentrations of Ca2+, Mg2+, Na+, and SO2-4 significantly increased in soil solution of both forest types while NO-3 decreased. Within the soil ecosystem, K+, NO-3, and H+ were strongly conserved. Concentration of soil solution SO2-4 is higher under conifers, and its flux two- to three-fold greater. This suggests the possibility that boreal conifer forests may be more susceptible to cation leaching by mobile anions as SO2-4 from atmospheric inputs.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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