Figure 1

Results of growth response of Picea glauca . Relative growth rates (RGR) of (a) height, (b) number of needles, and (c) length of the longest needle (n = 156). (d) Gross photosynthesis rate (n = 155). (e) Percentage of N content (n = 59). The upper dotted line is an adequate nitrogen level (1.45%). The lower dotted line is a severe deficiency level (1.05%). (f) δ¹³C content (n = 59). CTRL = control temperatures. GH = elevated temperatures. Above = above treeline site, Near = near treeline site, Below = below treeline site. Error bars show one standard error.