Figure 1
Light-saturated photosynthesis (Amax′), leaf N content per area (Narea), leaf N content per mass (Nmass), leaf mass per area (LMA), and photosynthetic-N use efficiency (PNUE) in the seedling leaves from the four studied tree species after exposure to different soil nitrogen (N) treatments. The statistical differences between each characteristic of the different species under three N treatments (mean ± SE) are the results of a one-way analysis of variance (ANOVA) (n = 7). The lowercase letters indicate significant differences at the 0.05 level between different N treatments, and the uppercase letters indicate significant differences at the 0.05 level between the species under the same N treatment. Control, high N; MN, medium N; and LN, low N.
