Physical Characteristics of Study Plots. Across a Lake States Acidic Deposition Gradient

摘要

Some people in the United States are concerned that atmospheric pollutants may be affecting the health of the Nation's forests (Barnard 1986). In response to that concern, the authors began research on the relations between forest conditions and atmospheric deposition across the Great Lakes region in 1985. The research consisted of a series of studies to describe: (1) the relations between sulfate (SO4) deposition in precipitation and soil and tree woody tissue chemistry; and (2) the interaction among wet deposition, soil, tree woody tissue chemistry, climate, and tree and plot growth (Ohmann et al. 1987, 1988; Holdaway 1988).