Responses of mean N resorption efficiency (NRE) to N addition for seven dominant species in the <i>Vitex negundo</i> (a) and <i>Spirea trilobata</i> (b) communities.

<p>Error bars indicate standard deviation (n = 6). Different letters on the error bars indicate significant differences among treatments for each species based on one-way ANOVA. Error bars indicate standard deviation (n = 6). Different letters on the error bars indicate significant differences among treatments for each species based on one-way ANOVA.