Abstract:Based on the measurement of biomass and the rate of its increase, caloric value ofrespective plant organs, energy of standing crop, annual net energy fixation and energyconversion efficiency in Cyclobalanopsis elevaticostata community in subtropical zone at950 m altitude in Fujian Province were determined in 1996. The results showed that thecaloric value of the bark was the highest and the microroot being the lowest among dryweight of plant organs in the community. Total energy of standing crop in the community was 852 058 kJ m-2, of which the aboveground part comprising 87.O1％, and the underground part 12.99％. Yearly net energy fixation was 28 273 kJ mkJ m-2， and energy conversion efficiency was 1.35％ for the community．