[Dynamics of biomass and net primary productivity in succession of south subtropical forests in southwest Guangdong].

Coniferous forest (Pinus massoniana community), pine-borad leaved mixed forest (Pinus massoniana + Castanopsis kawakamii + Schima superba + Liquidambar formosana) and evergreen broad-leaved forest (Ixonanthes chinensis + Artocarpus styacifolius + Ormosia glaberrima + Cryptocarya concinna) are the three main communities representing 3 major stages in a secondary succession series in Heishiding Nature Reserve, Guangdong Province. Their biomass and net primary productivity (NPP) were studied by using harvest method (for trees and lianas) and clear cut method (for shrub and herb). The biomass and NPP were 246.697 t.hm-2 and 14.715 t.hm-2.yr-1 for the coniferous forest, 287.367 t.hm-2 and 17.179 t.hm-2.yr-1 for the pine-broad leaved mixed forest, and 357.976 t.hm-2 and 18.730 t.hm-2 yr-1 for the evergreen broad-leaved forest, respectively. These results indicated that these three stages were very close in the succession process, and that coniferous forest and mixed forest were more mature, while broad-leaved forest was relatively young. Therefore, under the conditions of no or only minor disturbance, their biomass and NPP showed an increasing trend with the succession of the forest communities in Heishiding.