The biomass, productivity and efficiency of radiation utilization in Cryptocarya concinna community in Dinghushan Biosphere Reserve were investigated.The biomass, photosynthetic rate and respiration rate were measured by harvesting the sample plants of the main species in serveral layers and by CO2 infra-red analysis. After ward,the productivity and the efficiency of radiation utilization were calculated. The results show that the biomass, gross primary productivity and net primary productivity in the commu...