Empirical Bayes method(EBM),nonparametric methods (NPMs) (with include jack knife and bootstrap methods) and extrapolation of species area curves were used to estimate the number of species ( NS )in each of the five types of plant communities in Dongling Mountain,Beijing,China,and their performances were also examined.The following are the results.(1)as sampling intensity ( Sl ) was not very low,good point estimates be obtained with EBM,but the estimated standard deviations were greater than those wit...