Abstract:A study was carried out on the biomass,increment and energy of mangrove communities which were dominated by Avicernia marina,and located in Shenzhen Bay,southern Chian. The research results showed that retained biomass was 16,583.88 g/m2,for which aboveground and underground parts were accounted for 66.78% and 33.22%,respectively. Biomass increment of the communities in 1993 was 1,149.8 g/m2,which was mainly distributed among stem (323.96 g/m2),twig (238.33 g/m2),and perennial branches (213.06 g/m2). Caloric values of different plant fractions varied in a range of 16.1～18.22 kJ/g,however, the caloric value of stem wood was ranked on the top and that of mid-root on the bottom. The existing energy for the communities was 291,839 kJ/m2 for which 68.51% and 31.49% were partitioned into the above- and underground parts, annual energy accumulation in the communities was 20,213 kJ/m2 in 1993.