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Science 21 January 1983:
Vol. 219. no. 4582, pp. 289 - 292
DOI: 10.1126/science.219.4582.289
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Articles

The Use of Strontium-87/Strontium-86 Ratios to Measure Atmospheric Transport into Forested Watersheds

WILLIAM C. GRAUSTEIN 1 and RICHARD L. ARMSTRONG 2

1 Department of Geology and Geophysics, Yale University, New Haven, Connecticut 06511
2 Department of Geology, University of British Columbia, Vancouver, British Columbia, Canada V6T 2B4

Strontium-87/strontium-86 ratios indicate the sources of strontium in samples of natural waters, vegetation, and soil material taken from watersheds in the Sangre de Cristo Mountains of New Mexico. More than 75 percent of the strontium in the vegetation is ultimately derived from atmospheric transport and less than 25 percent from the weathering of the underlying rock. Much of the airborne strontium enters the watersheds by impacting on coniferous foliage, but deciduous foliage apparently traps little, if any, strontium-bearing aerosol. The strontium and presumably other nutrients are continuously recycled in a nearly closed system consisting of upper soil horizons, forest litter, and the standing crop of vegetation.

Submitted on March 29, 1982
Revised on June 25, 1982


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