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Fig. 5. Leaf N, P, and N/P in relation to mean annual temperature (MAT, °C) for species in five major plant groups by using data binned by temperature ranges. Among the angiosperm groups: for grasses, the fits were for N [coefficient of determination (r²) = 0.69, P = 0.006], P (r² = 0.81, P = 0.001), and N/P (r² = 0.66, P = 0.008); for herbs, the fits were for N (r² = 0.47, P = 0.03), P (r² = 0.76, P = 0.002), and N/P (r² = 0.83, P = 0.0006); for shrubs, the fits were for N (r² = 0.57, P = 0.05), P (r² = 0.89, P = 0.0004), and N/P (r² = 0.67, P = 0.04); and for trees, the fits were for N (r² = 0.96, P < 0.0001), P (r² = 0.76, P = 0.0009), and N/P (r² = 0.70, P = 0.003). For the coniferous trees, the fits were for N (r² = 0.72, P = 0.002), P (r² = 0.86, P < 0.0001), and N/P (r² = 0.78, P = 0.0007). Number of species in each MAT bin for each group averaged 32, and total number of data per group (across all MAT bins) averaged 316, ranging from 124 for conifers to 617 for angiosperm trees.

Fig. 6. Leaf N, P, and N/P in relation to mean annual temperature (MAT, °C) for five genera with abundant data when binned and significant relations. For Acer, the fits were for N [coefficient of determination (r²) = 0.67, P = 0.004], P (r² = 0.83, P = 0.005), and N/P (r² = 0.75, P = 0.02). For Betula, the fits were for N (r² = 0.56, P = 0.008), P (r² = 0.53, P = 0.05), and N/P (r² = 0.65, P = 0.003). For Calluna, the fits were for N (r² = 0.78, P = 0.05), P (r² = 0.93, P = 0.007), and N/P (r² = 0.97, P = 0.003). For Pinus, the fits were for N (r² = 0.25, P < 0.04), P (r² = 0.36, P = 0.002), and N/P (r² = 0.22, P = 0.02). For Vaccinium, the fits were for N (r² = 0.44, P = 0.03), P (r² = 0.45, P = 0.05), and N/P (r² = 0.44, P = 0.02).