Acidic deposition, cation mobilization, and biochemical indicators of stress in healthy red spruce
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Journal of Environmental Quality. 26: 871-876.
Dendrochemical and biochemical markers link stress in apparently healthy red spruce trees (Picea rubens) to acidic deposition. Acidic deposition to spruce forests of the northeastern USA increased sharply during the 1960s. Previous reports related visible damage of trees at high elevations to root and soil processes. In this report, dendrochemical and foliar biochemical markers indicate perturbations in biological processes in healthy red spruce trees across the northeastern USA.
Shortle, Walter C.; Smith, Kevin T.; Minocha, Rakesh; Lawrence, Gregory B.; David, Mark B. 1997. Acidic deposition, cation mobilization, and biochemical indicators of stress in healthy red spruce. Journal of Environmental Quality. 26: 871-876.