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Precipitation and Throughfall Chemistry in the San Francisco Bay Area¹

ABSTRACT

At Berkeley, California, main ionic constituents of bulk precipitation during the wet season of 1974–1975 were SO₄^2-, Cl^–, HCO₃^–, Na⁺, and Ca²⁺, and mean H⁺ concentration was 10.7 ± 1.5 µeq/liter (pH 5.0). Although SO₄^2- comprised 50% of the anions in bulk precipitation, H⁺ concentration had the highest correlation with NO₃^–. Impacted air pollutants accumulated on tree leaves between major rainstorms. Atmospheric N and S were correlated with NO₃^– and SO₄^2- in bulk precipitation and leafwash in a Eucalyptus globulus forest. Ionic composition of bulk precipitation resembled that of surface-soil solution in an adjoining, recently clear-cut area.

Key Words: nutrient cycling • Eucalyptus globulus • forest soil • acid rain • air pollution

¹ Contribution from the Dep. of Soils and Plant Nutrition, Univ. of California, Berkeley, CA 94720. The research was supported by the Agric. Exp. Stn., Univ. of California, Berkeley.

² Associate Professor and Graduate Research Assistant, respectively.

Received for publication December 15, 1977.