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. 2018 Feb 27;9:254. doi: 10.3389/fpls.2018.00254

FIGURE 2.

FIGURE 2

Responses of leaf gas exchange parameters [(A,B) net CO2 assimilation rate, (C,D) stomatal conductance and (E,F) transpiration rate] in Leymus chinensis to four treatments (C, control; N, nitrogen addition; D, drought; DN, nitrogen addition plus drought) at the middle (DOY 173) and the end (DOY 196) of the drought period. Impact-D = (XD – XC)/XC × 100, or = (XDN – XN)/XN × 100, where X indicates net CO2 assimilation rate, stomatal conductance, or transpiration rate. Different letters and asterisk indicate significant differences between the treatments (P < 0.05). The error bars represent standard errors of means (n = 6).