
Dry deposition of sulfur: a 23-year record for the Hubbard Brook Forest ecosystem
Abstract
Dry deposition of S was estimated for watershed-ecosystems of the Hubbard Brook Experimental Forest from 1964—65 through 1986—87. Two approaches, a regression analysis of bulk precipitation inputs and stream outputs and a mass-balance method, gave similar average values for Watershed 6 (430 and 410 eq SO4=/ha-yr, respectively, for this 23-year period). Dry deposition contributed about 37% of total S deposition, varying from 12% in 1964—65 to 61% in 1983—84. Long-term data from “replicated” watershed-ecosystems showed that temporal variability in estimates of dry deposition was considerably greater than spatial (between watersheds) variability.
© 1990 Gene E. Likens, F. Herbert Bormann, Lars O. Hedin, Charles T. Driscoll, John S. Eaton, published by Stockholm University Press
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