Fig. 3From: Tree regeneration characteristics in limestone forests of the Cat Ba National Park, Vietnama Sample-size-based (incidence-based), and b individual-based (abundance-based) rarefaction and extrapolation. The solid line depicts the interpolation, and the dotted line shows the extrapolation of sampling curves for tree species data of overstory and regeneration layers for different Hill numbers: q = 0 (species richness, left side), q = 1, (Shannon diversity, middle) and q = 2 (Simpson diversity, right side). The solid dots/triangles show the observed reference sample sizeBack to article page