Effects of nitrogen additions on mesophyll and stomatal conductance in Manchurian ash and Mongolian oak.

We believed that the increases of g m and g sc were largely related to the enlargement of leaf N content in this study because the relationships between leaf N content and g m and g sc strongly supported the promotion of leaf N content to g m and g sc increases, in which g m and g sc both showed a positive correlation with leaf N content, even though they were highly significant in Mongolian oak ( P < 0.01) (Fig. 2 ).

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