Table 1 Total net dry biomass C T(kg/hm2), total number of species N and thermodynamic factors (h , s and f , ton/hm2) of the investigated plant communities (Plot I: tailing site amended with organic manure; Plot II: tailing site amended with chemical fertilizers; Plot III: uncontaminated site;h , s , f , s/C T andf/C T: calculated, respectively, by Eqs. 2-6).