Logarithmic regression of <i>P. euphratica</i> crown areas against species abundance and richness.

<p>In regression line (Fig. 3a), each point indicating the richness of all species (no including <i>P. euphratica</i>) under the <i>P. euphratica</i> canopy. In regression line (Fig. 3b), each point indicating the abundance of all species (no including <i>P. euphratica</i>) under the <i>P. euphratica</i> canopy. The crown area of each sample is the sum of <i>P. euphratica</i> individuals.