Abstract:

The caloric value of mangrove orsans,the standing crop of energy,the net energy production and the photosythetically active radiation (PAR) effiCiency of the mangrove conunities at the Pearl River-Mouth are studied in this paper.The following findings are obtained: 1) The Caloric value of mangrove organs is 16.84~20.48kJ·g^-1,and 18.55kJ·g^-1 on average; 2) The shoding crop of energy of the mangrove communities is 154076~176099kJ·m^-2,and 171224kJ·m^-2 on average; 3) The net energy Production of the communities is 30380~41394kJ·m^-2·a^-1,and 36243kJ·m^-2·a^-1 on average,which is higher than that of the tropical rain forest and the savanna; 4) The utilization ratio of the PAR is 1.83% in sixteen-year-old and 1.38% in eleven-year-old Aegileras corniculatus community,1.38% in fifteen-year-old Kandelia candel conununity and 1.54% in twenty-year-old Aegiceras corniculatus-Ayucebue narina-Jabdelia candel community.

Key words: Mangrove community, Caloric value, Energy production, PAR, The Peal River Mouth