Mapped tree species richness derived with equation (1).

<p>Coloured circles, representing individual plots, vary in size according to observed tree species richness; large circles represent plots with high tree species richness (e.g., SR = 7 species per 0.1-ha plot) and small circles, low species richness (e.g., SR = 1 species per 0.1-ha plot). Plot tree-species dominance (accounting for ≥ 33% of all trees in a plot) is labelled according to colour (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0121172#pone.0121172.g004" target="_blank">Fig. 4</a>).