The sample completeness curve based on the 33 standard plots (black dot, i.e., sampling units). Plots of sample coverage for interpolated (solid line) and extrapolated sampling plots (dashed line). The 95% confidence intervals (shaded areas) were obtained by a bootstrap method based on 1000 replications. Each of the two curves was extrapolated to up to 250 plots A sampling coverage B species diversity (richness) estimated based on the extrapolated samples.