A model FPBG is used to simulate the effect of climatic change on the productivity andstructure of southern typical forest ecosystem and six Quercus L. forest stand ecosystem. FPBGis a model of forest photosynthesis biomass growth, using the from-bottom-to-up method,coinciding individual photosynthetic rate model, growth model and forest gap model. Datainvestigated and collected are put into the FPBG model. With the simulated daily weather dataat normal and Hadley scenarios as driving variable, th...