The number of species in a community,or the species richness,is the oldest and most fundamental concept of diversity.From its estimation we can acquire the information about species extinction rate,and this is important to the diversity conservation.Numerous methods have been proposed for estimating the number of species in a community.Some of them are theoretical sampling based,and others data analytic.The former includes frequentist and Bayesian procedures,and the latter integration of lognormal distrib...