Abstract
Deposition of sulfate and nitrate with gross precipitation, throughfall, and stemflow was observed at yellow-poplar and oak forest sites in the central Appalachians. For 1987, the sums of throughfall plus stemflow deposition of sulfate were 84.9 kg/ha at the yellow-poplar site and 92.1 kg/ha at the oak site; the corresponding values for nitrate deposition were 27.5 kg/ha and 33.8 kg/ha. The stemflow deposition of sulfate at the oak site was substantially greater than that at the yellow-poplar site. Both throughfall and stemflow were more acidic at the oak site than at the yellow-poplar site. The pH of throughfall shows substantial spatial variation. As the species composition varies with topography, the corresponding effect of forest canopy on throughfall pH and on soil is proposed. Errors of measuring atmospheric deposition in forests are discussed. Atmospheric deposition should be studied in combination with other phenomena which affect forest growth.
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