广西红海榄红树群落的能量研究

Study on the Energy of Rhizophora stylosa Mangrove Forest in Guangxi, China

本文主要研究广西山口英罗湾红海榄植物各组分的热值、落叶热值月变化、群落能量现存量及群落年能量固定量,结果表明:红海榄植物各组分热值之间有一定差异,波动范围为17.28～18.67kJ/g,落叶热值10月份高达18.19kJ/g,2月份低至17.30kJ/g,与鲜叶相比,落叶热值的波动较小,红海榄群落的能量现存量为5.20×10~5kJ/m^2;无过凋落物带走的能量年总量为1.12×10~4kJ/m^2;该群落的年能量固定量为2.73×10~4kJ/m^2,其中群落年净增长的能量(存留量)为1.61×10~4kJ/m^2占总固定量的58.9％,而能量固定量中其余部分占41.1％,以凋落物的形式向环境输送,这些能量是海湾河口生态系统中其它生物赖以生存和发展的重要能量基础。

Rhizophora stylosa is a mangrove species which is distributed in tropical coast areas in China. The gross caloric values of its various fractions range from 17. 28-18. 67 kJ/g, with the highest value for flower and fruit, and the lowest for trunk bark. The standing energy of R. stylosa community was 5. 2× 105 kJ/m2. The monthly highest caloric value of litter leaf was 18. 10 kJ/g in October and lowest value was 17. 30 kJ/g in February, The monthly changes of caloric value for litter leaf was lower than that for living leaf. The total energy flow through the litter fall was 1. 12×104 kJ/m2, and yearly net energy production in the stand was 2. 73×104 kJ/m2 in 1989. Such huge energy may be provided the base of the development of other organisms in mangrove ecosystem.