Reply To Schaberg Et Al.: Applying Stable Isotope Analyses To Examine The Influence Of Acid Deposition On Juniperus Virginiana
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA(2014)
摘要
Our conclusion that a Juniperus virginiana stand in the central Appalachian Mountains is recovering from decades of acid deposition was based on tree ring carbon isotope ratios (δ13C) that show: (i) close correspondence between the timing of changes in direction of δ13C with declines in SO2 emissions occurring after the Clean Air Act; (ii) close similarities between patterns of δ13C after 1980 and during the 1930s Great Depression when SO2 emissions were reduced; and (iii) support of our hypothesis that stomatal conductance would increase after the Clean Air Act if trees were recovering from acid deposition (1). The issues outlined …
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关键词
air pollution,sulfur
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