Abstract: Studies on C, Hand Ncontents and storages, annual energy and annual O₂ net productions in a 70 years old Rhizophora stylosa mangrove community at Yinluo Bay of Guangxishow that the C, H and N contents in different parts of the plant are 43.86-51.65%,4.35-5.72% and 0.28-1.44%, and their storages in the community are 14117.7,1446.4 and 158.5g·m^-2 respectively.The annual net fixed C, Hand N by the communityare respectively 798.51, 86.31 and 12.33g·m^-2, among which, annual reserved C, Hand Nare 441.22, 45.of and 5.37 g·m^-2, and annual outputs through litter are 357.29,41.30 and 6.96g·m^-2 respectively.The annual net production of energy by the community is 31227KJ·m^-2, and annual net release of O₂ is 2129g·m^-2.

Key words: Mangrove, Rhizophora stylosa, Element content, Energy, bud stage, physiological change, lily, quality of cut flower., drought stress