Abstract: Coniferous forest(Pinus massoniana community)，pine．broad leaved mixed forest(Pinus nlassoniana+Cas．tanopsis kawakamii+Schinna SUperba+Liquidambar fornlosana)and evergreen broad．leaved forest(Ixonan．thes chinensis + ArtocarpUS styacifolius+ Ormosia glaberrima + Cryptocarya concinna 1 are the three maincommunities representing 3 major stages in a secondary succession series in Heishiding Nature Reserve，Gungdong Province．Their biomass and net primary productivity(NPP)were studied by using harvest method(fortrees and lianas)and clear cut method (for shrub and herb)．The biomas and NPP were 246．697 t·hm and 14．715 t·hm-2 ·yr-1 f0r the coniferous forest。287．367 t·hm and 17．179 t·hm^-2 ·yr^-1 for the pine-broadleaved mixed forest．and 357．976 t·hm～ and 18．730 t·hm yr f0r the evergreen broa d．1eaved forest．respectively ．These results indicared that these three stages were very close in the succession process．and that coniferOUS fores t and mixed forest were m ore mature。while broa d—lea ved forest was relatively young．Therefore, under the conditions of no or only minor disturbance，their biom ass and NPP showed an increasing trend with the suecession of the forest communities in Heishiding.

Key words: urban green space, shrub, biomass model.