珠江口红树群落太阳光合有效辐射利用效率的研究

A STUDY ON THE PHOTOSYNYHRYICALLY ACYIVE TSFIAYION EFFICENCY OF THE MANGROVE COMMUNITIES AT THE PEARL RIVER-MOUTH

本文通过对珠江口红树热植、群落能量现存量、群落能量净固定量和大阳光合有效辐射利用效率的研究，为珠江口红树林保护、造林提供依据．

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. 48 kJ·g(-1), and 18. 55 kJ·g(-1) on average; 2) The shoding crop of energy of the mangrove communities is 154 076￣176099 kJ·m(-2), and 171 224 kJ·m(-2) on average; 3) The net energy Production of the communities is 30 380￣41 394 kJ·m(-2)·a(-1), and 36 243 kJ·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.