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. 2018 May 1;115(20):5187–5192. doi: 10.1073/pnas.1720777115

Fig. 2.

Fig. 2.

Effects of long-term N addition on foliar transpiration of dominant tree species (A), annual water flux below the primary rooting zones (B), and foliar intrinsic water use efficiency (iWUE) (C). Notes: (i) The different lowercase letters indicate significant differences at P < 0.05 levels among N treatment levels, and the different uppercase letters indicate significant differences at P < 0.1 levels, and no letters indicate no significant differences among N treatment levels (Tukey’s HSD test). Values are mean with SE. AA, Acmena acuminatissima; CC, Cryptocarya chinensis; CS, Castanopsis chinensis; MC, Machilus chinensis; SR, Syzygium rehderianum; SS, Schima superba. (ii) For annual water flux, there are significant differences at P < 0.05 level between controls and N treatment plots in the eighth and ninth year by using an independent-samples t test.