An intensive 1-month investigation of trace metal deposition and throughfall at a mountain spruce forest |
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| Authors: | W H Petty S E Lindberg |
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| Institution: | 1. Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, 37831-6038, Oak Ridge, TN, U.S.A.
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| Abstract: | During July 1986, atmospheric concentrations and deposition rates of Ph, Cd, Zn, and Mn were measured at a spruce forest in the Great Smoky Mountains National Park, and meteorological data were recorded. Precipitation, cloud water impaction, and dry deposition were quantified. Average total fluxes of 12, 1.0, 53, and 40 µg m?2 d?1 for Pb, Cd, Zn, and Mn, respectively, were measured; dry deposition constituted 46, 32, 62 and 66% of each of the totals. Cloud impaction (unusually low for this particular month) was measurable but not quantitatively important. Dry deposited Pb and Zn were washed from the canopy by subsequent rainfall — revealing greater throughfall fluxes associated with increasing antecedent dry period durations. Cadmium and Mn did not, however, show this relationship. Measurements revealed little interaction of Cd with the forest canopy, while considerable net leaching of Mn was evident (as had been expected). The canopy behaviors of both Pb (i.e., leaching) and Zn (i.e., uptake) were contrary to expectations. |
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