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Soil Acidity and Manganese in Declining and Nondeclining Sugar Maple Stands in Pennsylvania

^a Department of Crop and Soil Science, Pennsylvania State University, 116 ASI Building, University Park, PA 16802
^b School of Forest Resources and Penn State Institutes of the Environment, Pennsylvania State University, 136 Land and Water Building, University Park, PA 16802

View larger version (38K): [in a new window]   Fig. 1. Location of study sites in Potter County, Pennsylvania, USA.

View larger version (12K): [in a new window]   Fig. 2. Scatter plot of mean OA horizon pH and mean OA horizon 0.01 M SrCl2 extractable Mn for all three study sites. Spearman's nonparametric coefficient of rank correlation () indicates a highly significant negative correlation.

View larger version (12K): [in a new window]   Fig. 3. Plot of natural-log-transformed wood tissue Mg/Mn against mean OA horizon pH for the three study sites. Sites are distinguished with different point symbols. Spearman's nonparametric coefficient of rank correlation () indicates a significant positive correlation.