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Appendix E. Supplementary figure illustrating the relationship between measured and predicted foliar nitrogen.
Fig. E1. Relationship between measured and predicted foliar N for three dominant tallgrass prairie plant species. A. gerardii (filled circle), S. canadensis (filled square), and S. nutans (filled triangle). Predicted values of foliar N were calculated using the homeostasis models for each species and soil N measurements. Mean predictions were then compared with mean foliar N concentrations using linear regression and the slope was tested by fitting a standardized major axis through the data. The dashed line indicates a 1:1 relationship between predicted and measured foliar N, and the slopes did not differ significantly (P = 0.35).