The characters of Castanea crenata community recently extended around the field of Saengbiryang-myeon at Gyeongsangnam-do, in association with human activities were investigated for several ecological parameters and the results can be summarized as fellows. C. crenata is prevailing in the plantation area, whereas Pinus densiflora and Quercus mongolica are prevailing in its outskirts. Plant biomass and net production which estimated from degree of green naturality and Miami's model were much higher in natural forests than those of the plantation community. The mean species diversity of plantation was lower than that of natural populations. In stratification of investigated areas, overstory tree layer was dominant in the zone of plantation and dominant layers in the natural forest were understory tree layer, shrub, and herb. Demographic surveys have revealed that relative growth of each part of plants is continuous over the year.